Developer Tools

a0.dev is an AI-native mobile development platform that enables developers to build React Native mobile applications through natural language prompts and conversational AI interaction. The platform re

A1Base is an AI agent infrastructure company that provides the identity and communication primitives needed to deploy AI agents in the real world. Building a functional AI agent requires more than a l

Abundant is an AI agent development platform that provides the orchestration infrastructure needed to build agents capable of completing complex, multi-step tasks autonomously over extended time horiz

ActiveCampaign is a customer experience automation platform providing email marketing, marketing automation, CRM, and messaging for small and mid-sized businesses — combining sophisticated automation

Activepieces is a San Francisco-based open-source workflow automation platform — backed by Y Combinator with $1.55 million raised from ByTheTower, Forward VC, Fundamental VC, Kima Ventures, and Soma C

Airbyte is a San Francisco-based open-source data integration platform enabling data engineers and analytics teams to replicate data from 350+ source applications, databases, and APIs into data wareho

Alchemy is the dominant infrastructure and developer tools company for Web3 and blockchain application development. Founded in 2017 and headquartered in San Francisco, Alchemy provides the reliable, s

Algolia is a search-as-a-service and AI discovery platform that provides developers and businesses with APIs to build fast, relevant search and product discovery experiences. Founded in 2012 in Paris

Anthropic is a San Francisco-based AI safety and research company that builds the Claude family of large language models. As of 2026, the current Claude 4 generation includes claude-opus-4-6 (most cap

Anyscale is a San Francisco-based AI infrastructure company providing the managed platform for Ray — the open-source distributed computing framework originally developed at UC Berkeley's RISELab and n

Apigee is Google Cloud's API management platform providing the tools that enterprise organizations use to design, secure, publish, analyze, and monetize their APIs — serving as the management layer be

AppDynamics is a San Jose, California-based application performance management (APM) and full-stack observability platform — acquired by Cisco for $3.7 billion in 2017 and integrated into the Splunk O

Aqua Security is a Tel Aviv, Israel-based cloud-native security platform — privately held with $325 million raised at a $1 billion+ valuation from investors including TechAviv, Insight Partners, and L

Archbee is a Bucharest-based AI-powered documentation platform — backed by Y Combinator (W21) with $4.04 million raised including a $3 million seed round led by Global Founders Capital and Credo Ventu

Artie is a San Francisco-based real-time data streaming and change data capture (CDC) platform — backed by Y Combinator (W23) with $3.8 million in total funding including a $3.3 million seed in Februa

AssemblyAI is a leading speech AI platform providing APIs for transcription, speaker diarization, sentiment analysis, topic detection, and audio intelligence at enterprise scale. Founded in 2017 and h

Atla is a London, United Kingdom-based AI agent evaluation and improvement platform — backed by Y Combinator (S23) with $5 million raised in a seed round in December 2023 led by Creandum with YC and a

Authzed (now SpiceDB) is an open-source, Google Zanzibar-inspired authorization service that enables developers to define and evaluate fine-grained permissions at scale, decoupling authorization logic

Aviator is a San Francisco-based engineering productivity platform founded by ex-Googlers that automates merge queue management, code review workflows, and repetitive development tasks — solving the "

Baserun is a San Francisco-based LLM observability and evaluation platform — backed by Y Combinator (S23) with $500,000 in seed funding — providing AI application developers and engineering teams with

Beam is an AI-native cloud platform providing serverless infrastructure for deploying and scaling AI and machine learning workloads — enabling ML engineers and developers to run GPU-accelerated infere

Bitbucket is Atlassian's Git code repository hosting service integrated deeply into the Atlassian ecosystem alongside Jira, Confluence, and Trello, providing source control, continuous integration pip

Blacksmith is a San Francisco, California-based high-performance CI/CD infrastructure platform — backed with $13.5 million in total funding including a $10 million Series A in September 2024 led by Go

Bluejay is a data observability and pipeline monitoring platform designed for modern data engineering teams who need visibility into the health, accuracy, and reliability of their data pipelines and d

Brainboard is a Paris-based cloud infrastructure platform providing visual design tools integrated with Terraform automation — enabling DevOps and cloud engineering teams to design, visualize, and man

BrowserStack is a Mumbai, India-based cloud software testing platform — bootstrapped to profitability and backed with $253 million in total funding including a $200 million Series B in 2021 led by Bon

Browser Use is an open-source project that provides a Python library allowing AI agents and large language models to control web browsers as a tool. The library sits between LLM APIs and browser autom

Bruno is an open-source API client and testing tool — a lightweight, offline-first, git-friendly alternative to Postman and Insomnia — enabling developers to explore, test, and document APIs with coll

Bugsnag is an automated error monitoring and crash reporting platform that detects, diagnoses, and helps engineering teams resolve errors in web and mobile applications — providing real-time crash det

BuildBuddy is a San Francisco-based developer infrastructure company providing enterprise-grade remote build execution, caching, and observability tools for Bazel — Google's open-source build system u

BuildJet is a Tallinn, Estonia-based continuous integration (CI) performance platform — backed by Y Combinator (W23) with $500,000 raised from YC in 2023 — providing developer teams with GitHub Action

Buildkite is a continuous integration and continuous delivery (CI/CD) platform providing fast, scalable build and test automation infrastructure that runs on organizations' own cloud or on-premises co

Bunny.net is a Ljubljana, Slovenia-based content delivery network (CDN) and edge computing platform — backed by $6 million in Series A funding led by Runa Capital and Capital Genetics in October 2022

Bytebot is a San Francisco-based open-source AI agent infrastructure company — backed by Y Combinator with $125,000 raised from YC, Global Founders Capital, True Capital Management, Neman Ventures, an

Camfer is a precision contract manufacturing company specializing in CNC machining of complex metal components for aerospace, medical device, and industrial equipment customers. The company operates h

CaptivateIQ is a no-code incentive compensation management (ICM) platform that enables sales operations and finance teams to design, automate, and manage sales commission plans — replacing spreadsheet

Castari is a no-code workflow automation platform that enables non-technical business users to build AI-powered data pipelines and process automation without engineering support. While tools like Zapi

Cerebrium is a New York-based serverless cloud infrastructure platform for AI workloads — backed with $9 million raised including an $8.5 million seed round led by Google Gradient Ventures in July 202

Clerk is an authentication and user management company that provides developers with pre-built sign-up, sign-in, and user profile components alongside a complete backend API for identity management. A

Cloudflare is a global cloud platform providing web performance, security, and network services to millions of websites and applications worldwide. Founded in 2009 by Matthew Prince and Michelle Zatly

CodeAnt AI is a San Francisco-based AI code health and automated code review platform — backed by Y Combinator (W24) with $2.5 million in total funding including a $500,000 seed in 2024 and a $2 milli

CodeCrafters is a Concord, California-based programming education platform where experienced software engineers build real-world developer tools from scratch — creating Redis, Git, SQLite, HTTP server

Codegen is an AI software engineering platform that automates complete development workflows—from reading a GitHub issue or feature request to writing the code, running tests, and submitting a pull re

Codeium is an AI-powered code acceleration toolkit that provides developers with intelligent code completion, natural language code generation, and automated refactoring capabilities across multiple p

Cohere is an enterprise AI platform company providing large language model APIs, embedding models, and AI deployment infrastructure for enterprise applications — competing with OpenAI and Anthropic in

Confluent is an enterprise data streaming platform built around Apache Kafka, providing fully managed Kafka infrastructure, stream processing, and data integration capabilities that enable real-time d

Cosine is a San Francisco-based AI software engineering company building autonomous coding agents that enable development teams to work on multiple software tickets simultaneously — with the AI agent

Cursor is an AI-powered code editor built on Visual Studio Code that integrates advanced language models to provide intelligent code completion, generation, debugging, and refactoring capabilities dir

Customer.io is a Beaverton, Oregon-based marketing automation platform that enables businesses to create personalized, behavior-driven email, SMS, push notification, and in-app messaging campaigns. Fo

Cypress is an open-source, JavaScript-based end-to-end testing framework designed specifically for modern web applications, providing developers with fast, reliable automated testing capabilities. The

Datafold is a data observability and data quality testing platform that helps data engineering teams automatically detect data quality regressions, schema changes, and anomalies in their data pipeline

Dataland is a New York-based no-code collaborative data management platform — backed by Y Combinator (W20) with funding from South Park Commons and Switch Ventures — providing business teams with a sp

Deepgram is a speech AI company providing fast, accurate, and cost-efficient speech-to-text and audio intelligence APIs built on proprietary end-to-end deep learning models. Founded in 2015 and headqu

Defog.ai is a San Francisco-based enterprise data analysis company building fine-tuned language models for structured data — most notably SQLCoder, an open-source LLM that outperforms GPT-4 on text-to

Delty is a quality assurance automation company that uses AI to generate, execute, and maintain software test suites from natural language descriptions and existing codebase analysis. Traditional QA a

Depot is a remote Docker build cache and layer storage service that dramatically accelerates Docker image builds in CI/CD pipelines — providing a shared, persistent build cache that allows consecutive

Docker is a platform for developing, shipping, and running applications in lightweight, portable containers that package software with all dependencies, enabling consistent deployment across different

Docker Hub is the world's largest container image registry and library, providing a platform for developers to discover, share, and distribute Docker container images for applications and services. Th

Docket is a meeting productivity platform that uses AI to eliminate the administrative overhead of meetings by automatically capturing, transcribing, and analyzing conversations to produce structured

Dollyglot is an AI companions platform building photo-to-video avatar technology that brings personalized interactive AI personas to life — turning a static photo and voice clip into a real-time video

DraftAid is a Toronto, Ontario-based AI engineering documentation startup — backed by Y Combinator (Winter 2024 cohort) with $500,000 in seed funding — building the world's first generative AI platfor

Drata is a security and compliance automation platform that continuously monitors and collects evidence for SOC 2, ISO 27001, GDPR, HIPAA, and other compliance frameworks, streamlining audit processes

Ellipsis is a San Francisco-based AI code review and bug fix tool — backed by Y Combinator (W24) with $2 million in seed funding in April 2024 from Twenty Two Ventures, Four Cities Capital, Garage Cap

Emergent is an AI developer platform providing the infrastructure, APIs, and tooling that engineering teams need to build, test, deploy, and monitor AI-powered applications and autonomous agents in pr

Envoy is the most widely deployed cloud-native proxy, originally developed at Lyft and now a Cloud Native Computing Foundation (CNCF) graduated project since November 2018 — serving as the default sid

Epsilla is a United States-based AI agent development platform — backed by Y Combinator (S23) with $500,000 raised from YC, Nivesha Ventures, and Ride Wave Ventures — providing domain professionals, A

Eventual is an infrastructure platform enabling developers to build distributed cloud applications with event-driven workflows, long-running processes, and reliable async coordination patterns that ar

Exa is a next-generation AI search engine and API designed specifically for AI agents and developers — providing LLM-optimized web search that returns clean, structured content from web pages rather t

Extend is a San Francisco-based AI document processing platform using large language models to provide accurate data extraction and document understanding for enterprise workflows — turning unstructur

FarmLogs is a farm management software platform acquired by Bushel (an agricultural supply chain software company) in 2020 — providing crop farmers and agricultural operations with digital tools to tr

Fastly, Inc. is a San Francisco-based edge cloud platform — listed on NYSE (NYSE: FSLY) — providing developers and enterprises with content delivery network (CDN), DDoS protection, edge computing (Com

Feedonomics is a Los Angeles-based product feed management and optimization platform — acquired by BigCommerce (NASDAQ: BIGC) in 2021 for $145 million — that helps e-commerce brands and retailers synd

Fern is a New York-based API tooling company that automatically generates multi-language SDKs and API documentation from OpenAPI specifications — enabling API companies to publish high-quality client

Firecrawl is a San Francisco-based web data infrastructure platform providing an AI-optimized web scraping and crawling API that converts websites into clean, structured data (Markdown, JSON, HTML) fo

Flagsmith is an open-source feature flagging and remote configuration platform that enables engineering teams to deploy code continuously and control feature releases, A/B tests, and configuration cha

Flower is a San Francisco-based open-source federated learning framework company — backed by Y Combinator (W23) with $20 million in Series A funding in February 2024 led by Felicis Ventures with parti

FlutterFlow is a no-code and low-code app builder that enables users to create native iOS, Android, and web applications by visually designing screens, connecting backend services (Firebase, Supabase,

Fly.io is a Chicago-based cloud infrastructure platform enabling developers to deploy and run containerized applications globally at the network edge — distributing applications across 35+ regions wor

GitHub Actions is Microsoft's CI/CD (continuous integration/continuous deployment) and workflow automation platform built natively into GitHub — enabling developers and DevOps teams to automate softwa

GitHub Copilot is an AI-powered coding assistant developed by GitHub (Microsoft) in partnership with OpenAI, providing real-time code suggestions, function completions, documentation generation, and w

Gitpod is a cloud development environment (CDE) platform that provides automated, ephemeral development workspaces accessible from any browser — enabling developers to start coding in seconds without

Greptile is a San Francisco-based AI code review platform — backed by Y Combinator (W24) with $29.1 million raised including a $25-30 million Series A at $180 million valuation led by Benchmark in Sep

GrowthBook is a San Francisco-based open-source feature flagging and A/B testing platform — backed by Y Combinator (W22) — providing engineering teams and product managers with a self-hostable, wareho

H2O.ai is an open-source machine learning and AI platform company providing automated machine learning (AutoML), model explainability, enterprise AI application development, and generative AI tools —

Hamming AI is a testing and evaluation platform specifically designed for voice AI agents and conversational AI phone systems. As businesses increasingly deploy AI-powered phone agents for customer se

Harness is a software delivery and DevOps platform that uses AI to make CI/CD pipelines faster, more reliable, and easier to manage at enterprise scale. Founded in 2016 by Jyoti Bansal (also the found

HashiCorp develops infrastructure automation software that enables organizations to provision, secure, and manage cloud infrastructure across multiple platforms. The company serves DevOps teams, platf

Helicone is a San Francisco-based open-source LLM observability and monitoring platform — backed by Y Combinator (W23) — providing AI application developers and engineering teams with comprehensive vi

Heroku is a cloud application platform (PaaS) that enables developers to deploy, manage, and scale web applications without managing server infrastructure — supporting multiple programming languages (

Hightouch is a San Francisco-based data activation and composable CDP (Customer Data Platform) platform — backed with approximately $220 million in total funding including an $80 million Series C in F

Hoppscotch is an open-source API development and testing platform — providing a web-based, lightweight alternative to Postman and Insomnia for building, testing, and documenting REST, GraphQL, WebSock

hotglue is an embedded iPaaS (integration platform as a service) that enables SaaS companies to add native, user-facing integrations to their products — providing the pre-built connectors, user authen

Hugging Face is the leading AI model hosting and collaboration platform and the creator of the Transformers library — providing open-source infrastructure for sharing, discovering, and deploying machi

Humanloop is a London, UK-based AI model evaluation and LLM observability platform — backed by Y Combinator (W20) with $7.9 million raised including a $5 million seed plus round in November 2023 led b

Hyperspell is an AI document intelligence company that combines AI-assisted writing with structured knowledge management to help teams create and maintain complex long-form documents more efficiently.

IcePanel is a Vancouver, Canada-based software architecture design and communication platform — backed by Y Combinator (W23) with $500,000 in convertible note funding in January 2023 from Y Combinator

InfluxData is the company behind InfluxDB, the world's most widely deployed open-source time series database, designed to store and analyze metrics, events, and time-stamped data at high ingestion rat

Infracost is a San Francisco-based cloud cost management platform — backed by Y Combinator (W21) with $17.2 million raised including a $15 million Series A led by Pruven Capital with Insight Partners

Inkeep is a San Francisco-based AI-powered customer support automation platform that enables developer-facing companies to build AI assistants that answer technical questions from their documentation,

Insomnia is an open-source API development and testing platform that provides developers with a powerful client for designing, debugging, and testing REST, GraphQL, SOAP, and WebSocket APIs — offering

Interfere is an API integration automation company that uses AI to generate, deploy, and maintain the connectors that link enterprise software systems together. Building API integrations is one of the

Istio is a CNCF-graduated (2023) open-source service mesh providing traffic management, mutual TLS security, load balancing, circuit breaking, and distributed observability for microservices-based app

Jestor is a no-code/low-code platform that enables businesses to build custom internal tools, automate workflows, and manage structured data without writing software — providing a visual interface to

Jet Admin is a San Francisco-based no-code internal tool and admin panel builder — backed by Y Combinator (W20) with $125,000-150,000 in funding from YC — providing businesses with a visual platform f

JetBrains is a software development tools company creating integrated development environments and productivity tools for professional developers across multiple programming languages. The company ser

Jitsu is a San Francisco-based open-source data integration platform enabling data engineers to build real-time event data pipelines that collect, transform, and route user behavior events from web an

Kernel is a data engineering automation platform that uses AI to reduce the manual work involved in building and maintaining data pipelines, transformations, and schemas. Modern data teams spend a dis

Kong is an enterprise API management and service connectivity platform providing an API gateway, service mesh, and developer portal for organizations managing hundreds of microservices and APIs. Found

LanceDB is an open-source vector database purpose-built for AI applications, offering serverless vector storage with embedded deployment, multimodal data support (text, images, video, audio), and nati

Lancey is a Toronto, Canada-based AI code automation platform — backed by Y Combinator (S22) with $2 million raised from Panache Ventures, Union, Garage Capital, Functional Capital, YC, Wallace Capita

Langfuse is an open-source LLM observability and engineering platform — providing the debugging, analytics, and prompt management tools that development teams need to build, monitor, and improve AI ap

Lightdash is a London-based open-source business intelligence platform positioning as the developer-friendly alternative to Looker — enabling data teams to build self-serve analytics from dbt (data bu

Lightspeed Commerce is a cloud-based point-of-sale and commerce platform serving restaurants, retail stores, and golf clubs with POS, payments, inventory management, and ecommerce capabilities integra

Linear is a San Francisco-based project management and issue tracking platform built for software development teams — providing sprint planning, issue tracking, roadmaps, bug tracking, and project man

Lume is an AI-powered data mapping and transformation platform that automates the complex, manual process of mapping data from source schemas to target schemas — compressing implementation timelines t

MagicBell is a San Francisco-based notification infrastructure platform providing developers with a unified API and pre-built UI components to deploy multi-channel notifications across in-app, email,

Magic Patterns is a San Francisco-based AI design platform enabling developers and product teams to generate production-ready UI component code from natural language prompts, Figma designs, screenshot

Marketo is a leading B2B marketing automation platform now part of Adobe — providing email marketing, lead management, account-based marketing (ABM), consumer marketing automation, and revenue attribu

Mem0 (pronounced "mem-zero") is an open-source memory infrastructure layer for AI agents and applications, enabling large language model-powered systems to remember information across conversations, u

Memberstack is a Williamsburg, Virginia-based no-code membership and authentication platform that enables web designers and developers to add user accounts, gated content, and membership subscription

Meticulous is a London-based test automation company that automatically generates end-to-end browser tests by recording actual user sessions — capturing real user flows through a JavaScript SDK instal

Mezmo, formerly known as LogDNA, is an observability data pipeline company that provides log management and telemetry routing infrastructure for engineering teams at technology companies. The company

Middleware is an observability and monitoring platform providing application performance monitoring (APM), distributed tracing, log management, and infrastructure metrics in a unified view for enginee

Mindee is a document AI and OCR technology company providing developer APIs for automated data extraction from structured and semi-structured documents — invoices, receipts, identity documents, passpo

Mintlify is a developer documentation platform that uses AI to auto-generate, update, and maintain software documentation from codebases — providing beautiful, searchable documentation sites with AI-p

Mistral AI is a French artificial intelligence company building and commercializing high-performance open and proprietary large language models, positioning itself as Europe's leading AI foundation mo

Mito is a New York-based developer tools company providing a JupyterLab spreadsheet extension that automatically generates Python code as users edit data — enabling Excel-proficient data analysts to a

Mocha is a San Francisco-based AI-powered full-stack web application builder — backed by Y Combinator with $2.1 million in funding in 2025 — providing entrepreneurs, product managers, and technical us

Modal is a serverless cloud computing platform purpose-built for AI and machine learning workloads — providing on-demand GPU compute that scales instantly from zero with per-second billing, container

Momentic is a San Francisco-based AI-native automated testing platform that enables development teams to create, execute, and maintain end-to-end tests using natural language — eliminating the traditi

MongoDB is a leading document-oriented NoSQL database company providing a flexible, developer-friendly data platform for modern applications that require horizontal scalability, flexible schemas, and

MuleSoft is an integration platform-as-a-service (iPaaS) that enables enterprises to connect applications, data sources, and APIs across cloud and on-premises systems — providing the integration middl

Mux is a video infrastructure company that provides APIs for developers to build streaming video experiences without managing the complex encoding, delivery, and analytics infrastructure that professi

n8n is a workflow automation platform that differentiates itself in the crowded automation market through its open-source model, deep AI integration, and flexibility for technical users. While Zapier

Nango is a San Francisco-based integration infrastructure platform — backed by Y Combinator (W23) with $1.2 million in annual revenue in 2024 — providing developers and engineering teams with a unifie

Neon is a serverless PostgreSQL platform offering instant database provisioning, automatic scaling to zero, and database branching — capabilities that make it uniquely suited for modern application de

Netlify is a web hosting and serverless platform enabling developers to deploy websites and web applications with continuous deployment from Git repositories, serverless functions, edge computing, and

Noloco is a Dublin-based no-code platform that enables non-technical teams to build internal tools and business applications directly from existing databases — including PostgreSQL, MySQL, Airtable, G

Observe Inc. is a San Mateo, California-based AI-powered observability platform — backed with approximately $393 million in total funding including a $145 million Series B in September 2024 led by Evo

Odigos Technologies is a Boston, Massachusetts-based enterprise observability platform — backed by Y Combinator (W23) with $13 million+ in funding in September 2024 led by Venture Guides with Salesfor

Omnara is a developer documentation automation company that addresses one of the most persistent pain points in software engineering: documentation that becomes outdated the moment code changes. The p

Onboard.io is a customer onboarding software platform for B2B SaaS companies — providing structured implementation project management that guides new customers through activation milestones, automatin

Onlook is a San Francisco-based open-source visual development tool — backed by Y Combinator — building the visual IDE for designers and developers who build React applications, enabling direct in-bro

OpenAI is a San Francisco-based artificial intelligence company developing and deploying large-scale AI systems — including GPT-4o, o1 reasoning models, DALL-E 3 image generation, Sora video generatio

OpenAI Platform is the developer API platform of OpenAI — providing programmatic access to OpenAI's large language models (GPT-4o, o1, o3, Whisper, DALL-E, Sora) and AI tools through a REST API that d

Opsera is a Palo Alto, California-based AI-powered DevSecOps orchestration platform — having raised $51.3 million total including a $20 million Series B in 2025 led by Prosperity7 Ventures with Hitach

Orchids is an AI full-stack software engineer platform that generates fully functional, responsive web applications and websites from a single text prompt — handling everything from UI design to backe

PandasAI is a Munich, Germany-based open-source conversational data analysis platform — backed by Y Combinator (W24) with $1.22 million in total funding including a $1.1 million pre-seed in fall 2023

ParadeDB is a San Francisco-based database company — backed by Y Combinator (S23) with $14 million in total funding including a $12 million Series A in 2025 led by Craft Ventures with Y Combinator — p

Paradigm is a San Francisco-based AI-powered spreadsheet platform — backed by Y Combinator (W24) with $7 million in total funding including a $5 million seed led by General Catalyst and a $2 million p

Paw is a powerful REST, GraphQL, and HTTP API testing client for macOS, designed for developers who need a native, feature-rich alternative to web-based tools like Postman. Founded and developed as an

Pinecone is a San Francisco-based managed vector database company providing purpose-built infrastructure for storing, indexing, and querying high-dimensional vectors used in AI applications — enabling

Plaid is a financial data infrastructure company that provides the API layer connecting financial applications to bank accounts and financial data. Founded in 2013 by Zach Perret and William Hockey, P

PlanetScale is a serverless MySQL-compatible database platform built on Vitess, the open-source horizontal sharding technology originally developed at YouTube to scale MySQL to planetary-scale traffic

Planful is a Redwood City, California-based cloud financial planning and analysis (FP&A) platform providing mid-market and enterprise finance teams with integrated budgeting, forecasting, reporting, c

Playwright is an open-source browser automation and end-to-end testing framework developed by Microsoft (NASDAQ: MSFT) — enabling developers and QA engineers to write reliable tests for web applicatio

Portainer.io is a New Zealand-based container management platform that simplifies Docker and Kubernetes environment management through a web-based GUI — enabling development teams, DevOps engineers, a

Postman is the world's leading API development platform — providing the tools that 30 million+ developers use to design, build, test, document, and monitor APIs throughout the software development lif

Prequel is a photo and video editing app for iOS and Android that provides film-like aesthetic filters, cinematic presets, analog film emulations, and AI-powered editing tools that transform smartphon

Productive.io is a professional services automation (PSA) platform designed for agencies, consulting firms, and software development studios — combining project management, resource planning, time tra

Promptless is a developer documentation automation tool that uses AI agents to proactively keep customer-facing documentation current with software product changes — monitoring pull requests, Jira/Lin

PropelAuth is a Mountain View-based authentication infrastructure company specializing in B2B SaaS authentication — providing pre-built team and organization management features (multi-tenant organiza

Pythagora is a Zagreb, Croatia-based AI software development platform — backed by Y Combinator (W24) with $4 million in seed funding from 500 Global, YC, UpHonest Capital, Moonfire Ventures, Inovo, an

Quantstruct is a US-based AI documentation engineering platform that automatically creates, tests, and improves product documentation for hypergrowth technology companies — serving API-first SaaS prod

QuestDB is a London, United Kingdom-based open-source time-series database — backed by Y Combinator (W20) with $14.4-18 million in total funding including a $12 million Series A in November 2021 from

QuickNode is a blockchain infrastructure provider offering high-performance RPC (Remote Procedure Call) node endpoints, APIs, and developer tools for Web3 applications — enabling blockchain developers

Railway is a cloud infrastructure company building the most friction-free developer deployment experience in the market. Where platforms like AWS and GCP require extensive configuration, IAM policy ma

Rancher Labs is a Kubernetes management platform company acquired by SUSE in December 2020 for $600-700 million — creating within SUSE the world's largest enterprise Linux and Kubernetes organization

RapidAPI is the world's largest API marketplace and developer hub, providing a platform where developers discover, connect to, and manage thousands of public and private APIs through a unified interfa

Raycast is a London, UK-based developer productivity and application launcher — backed by Y Combinator (W20) with $47.8 million in total funding including a $30 million Series B in September 2024 led

Reducto is a San Francisco-based AI document intelligence company — backed by $108 million in total funding including a $75 million Series B led by Andreessen Horowitz in October 2025, plus a $24.5 mi

Reflex is a San Francisco-based open-source web application framework enabling Python developers to build full-stack web applications entirely in Python — without writing any JavaScript or CSS — with

Regie.ai is a San Francisco-based AI sales engagement platform providing enterprise B2B sales teams with generative AI for prospecting email creation, sequence personalization, and sales content gener

Release is a United States-based Environments as a Service (EaaS) platform — backed by Sequoia Capital with seed funding — providing development teams with ephemeral, test, QA, and staging environment

Render is a unified cloud platform designed to make application deployment and hosting as simple as possible for developers, positioning itself as the modern, developer-friendly alternative to both le

Replicate is a San Francisco-based cloud platform that makes it easy to run and deploy machine learning models through a simple API — providing access to thousands of pre-trained open-source models (S

Replit is a San Francisco-based AI-powered coding platform — backed with $97.4 million raised at a $1.16 billion valuation from a16z, Y Combinator, and others — providing browser-based development env

Resend is a San Francisco-based developer-first email infrastructure company providing a modern email API — built on React Email and optimized for developer experience — that enables software teams to

Retool is a low-code development platform that allows software engineers and technical teams to build internal business applications dramatically faster than writing them from scratch. Founded in 2017

Roboflow is a San Francisco-based computer vision platform — backed with $40 million raised from OpenAI Fund, Craft Ventures, and Y Combinator at an estimated $200 million valuation — providing develo

Rollbar is a real-time error monitoring and debugging platform that captures software exceptions, stack traces, and user context from web and mobile applications — enabling developers to identify, pri

Rootly is a San Francisco-based incident management platform — backed by Y Combinator (W21) with $15.2 million raised including a $12 million Series A led by Renegade Partners in August 2023 — automat

S2 is an AI-powered security platform focused on vulnerability discovery and attack surface management for enterprise security teams. The company's platform combines automated scanning, AI-powered ana

Scaleway is a French cloud computing provider and subsidiary of Iliad Group, the telecommunications and technology conglomerate founded by billionaire Xavier Niel. Originally launched as Online.net in

Scoro is a business management platform designed for professional services companies — agencies, consultancies, and service firms — providing project management, resource planning, time tracking, bill

Selenium is the leading open-source web browser automation framework used by QA engineers and developers to write automated tests that control real browsers (Chrome, Firefox, Safari, Edge) for web app

Semaphore is a CI/CD (continuous integration and continuous deployment) platform providing fast, scalable pipeline automation for software development teams — available as Semaphore Cloud (fully manag

Sendbird is a communications platform company that provides APIs and SDKs for building in-app chat, voice, and video experiences into mobile and web applications. Building real-time messaging from scr

Sentry is an open-source application monitoring and error tracking platform used by over 100,000 organizations to detect, diagnose, and resolve software errors in production — automatically capturing

Shuttle is a London-based cloud infrastructure platform enabling developers to deploy Rust applications from code to production in seconds with zero configuration — providing a Rust-native deployment

Signadot is a San Francisco-based Kubernetes testing platform — backed by Y Combinator with $4.15 million raised including a $4 million seed round led by Redpoint Ventures in February 2022 with partic

Silimate is a Mountain View, California-based AI chip design platform — backed by Y Combinator (S23) with $2.5 million in total funding from Pioneer Fund, MBA Fund, Y Combinator, LombardStreet Venture

Snyk is a developer security platform that integrates security testing directly into the developer workflow — scanning code, open-source dependencies, container images, and infrastructure-as-code for

SonarQube (by SonarSource) is the leading static code analysis and code quality platform that helps software development teams identify bugs, security vulnerabilities, code smells, and technical debt

Speedscale is a Kubernetes-native performance testing platform that eliminates the gap between staging and production environments — capturing real user traffic from production, sanitizing it of perso

Spline is a Santiago, Chile-founded (now San Francisco-based) collaborative web 3D design platform — backed by Y Combinator (W21) with $32 million in total funding including a $16 million Series A in

Spur is an AI testing platform that enables engineering teams to create, maintain, and run comprehensive end-to-end browser tests without requiring expertise in test automation frameworks. Traditional

SRE.ai is a platform that brings AI automation to site reliability engineering (SRE), addressing one of the most challenging problems for engineering teams at scale: managing the increasing complexity

Stably AI is a San Francisco-based AI test automation platform — backed by Y Combinator — reaching $1 million in annual revenue in December 2024 with a 5-person team — providing engineering teams with

StackAI is a Cambridge, Massachusetts-based enterprise AI platform enabling organizations to build custom AI assistants, automated workflows, and document processing pipelines through a low-code inter

Stacker is a data journalism and content marketing platform that produces fact-based, data-driven news stories using publicly available datasets — generating thousands of articles annually about topic

Stagewise is a developer experience tool that bridges the gap between visual browser-based development and AI coding assistance. The platform provides a browser extension and IDE integration that allo

StayNTouch is a cloud-based property management system (PMS) for hotels and resorts, providing front desk operations, reservations, housekeeping management, and guest engagement tools through a modern

Strapi is a Paris, France-based open-source headless CMS company — backed with $49 million in total funding including a $31 million Series B in June 2022 led by CRV with Flex Capital, Index Ventures,

Subtrace is a US-based zero-code network observability platform — backed by Y Combinator — providing backend engineering teams with full request-level visibility into every API call, database query, a

Supabase is an open-source backend-as-a-service platform that provides developers with a fully managed PostgreSQL database alongside a suite of backend services—authentication, file storage, edge func

Superglue is an AI-powered API integration company that eliminates the manual coding required to connect software services through their APIs. Every API integration traditionally requires a developer

Superwall is a San Francisco-based mobile subscription paywall platform that enables iOS and Android app developers to remotely configure, test, and optimize their in-app subscription paywalls without

Svix is a San Francisco-based webhooks infrastructure platform — backed by Y Combinator (W21) with $13 million raised including a $10.4 million Series A in February 2023 led by Andreessen Horowitz wit

Swagger (now part of SmartBear Software) is the world's most popular API development toolset — including Swagger UI (interactive API documentation), Swagger Editor (browser-based OpenAPI spec editor),

Swoogo is an enterprise event management platform enabling organizations to create, manage, and measure virtual, hybrid, and in-person events with registration, engagement, and analytics tools. The co

Tabnine is a Tel Aviv, Israel-based AI code completion and developer productivity platform — backed by $67.4 million in total funding including a $25 million Series B led by Telstra Ventures and Atlas

Tailor is a San Francisco-based headless ERP platform that replaces monolithic legacy back-office systems for retail and e-commerce operations — providing composable, API-first infrastructure for orde

Telnyx is a Chicago, Illinois-based cloud communications platform — privately held with $60+ million raised from investors including Salesforce Ventures, Felicis Ventures, and ICONIQ Growth — providin

Temporal Technologies is an open-source durable execution platform that makes it possible to build reliable distributed applications and workflows that survive infrastructure failures — server crashes

Thoropass is a compliance automation platform that helps companies achieve and maintain security and privacy certifications including SOC 2, ISO 27001, HIPAA, and GDPR through continuous monitoring. T

Tiptap is a Berlin, Germany-based developer toolkit company — backed by Y Combinator (S23) with $2.6 million in seed funding in October 2023 led by Expa with Y Combinator and angels Dennis Just, Radu

ToDesktop is a United Kingdom-based web-to-desktop application platform — backed by Y Combinator with $150,000 in total funding from Y Combinator and Frontline Ventures — providing developers with inf

Traceloop is a Tel Aviv, Israel-based LLM observability platform — backed by Y Combinator with $6.6 million in total funding including a $6.1 million seed in May 2025 led by Sorenson Capital and Ibex

Truffle AI is a sales intelligence company that mines open-source developer activity, GitHub signals, and public technical data to identify B2B software buying signals before they become visible throu

Turso is a San Francisco-based edge database company providing a globally distributed SQLite-compatible database platform — built on libSQL (a fork of SQLite) — that enables developers to deploy datab

Tweeks.io is a browser extension that enables users to modify any website using natural language descriptions — functioning as a next-generation userscript manager that generates and applies custom Ja

Ubicloud is an open-source cloud platform providing an alternative to AWS for infrastructure teams — offering elastic compute, block storage, managed Postgres, load balancers, and GitHub Actions runne

Unify is a Y Combinator-backed AI infrastructure company providing a unified API gateway for enterprise AI model access — enabling organizations to access 100+ LLMs from OpenAI, Anthropic, Google, Mis

VectorShift is a United States-based no-code generative AI automation platform — backed by Y Combinator (S23) with $3.5 million in total funding including a $3 million seed in February 2024 from 1984

Vellum is an AI product development platform providing prompt management, model comparison, workflow orchestration, and production monitoring tools for engineering and product teams building LLM-power

Velt is a developer collaboration toolkit that provides a JavaScript/TypeScript SDK enabling product teams to embed 25+ real-time collaborative features into their SaaS applications — including AI-pow

Vercel is a cloud platform company that has fundamentally changed how frontend web applications are built, deployed, and scaled. Founded in 2015 by Guillermo Rauch, Vercel created Next.js—now the most

Versori is a London-based agentic integration platform enabling businesses to build, deploy, and manage custom software integrations and automation workflows through a no-code, AI-powered environment

Visual Studio Code (VS Code) is a free, open-source code editor — developed and maintained by Microsoft Corporation (NASDAQ: MSFT) and released under the MIT License on GitHub — providing software dev

Vocode is a San Francisco-based open-source voice AI company providing a developer library and platform for building real-time conversational voice applications — enabling developers to create AI voic

WarpBuild is a cloud CI/CD infrastructure platform providing fast, scalable GitHub Actions runners (Linux, macOS, and ARM) as a managed service — enabling software engineering teams to run their CI/CD

Wasp is a Zagreb, Croatia-based full-stack web development framework — backed by Y Combinator (W21) with $5.2 million in total funding including a $3.7 million round in late 2024 led by HV Capital wit

Waydev is an engineering productivity intelligence platform that helps software engineering leaders measure and improve developer productivity — providing DORA metrics (Deployment Frequency, Lead Time

Webhound is a San Francisco-based AI web research automation platform — backed by Y Combinator (S23) with $38.7 million in total funding from Unpopular Ventures, Y Combinator, and Amino Capital — prov

Weights & Biases (W&B) is the leading MLOps and AI developer platform for tracking machine learning experiments, visualizing training runs, managing model versions, and evaluating AI model performance

WeWeb is a no-code front-end builder that enables product teams and developers to build production-grade web applications by connecting visual interface design with any backend data source or API — of

Whalesync is a San Francisco-based no-code data synchronization platform providing bi-directional real-time sync between popular business tools — Airtable, Notion, HubSpot, Webflow, PostgreSQL, and ot

Wordware is an AI application development platform that enables teams to build, iterate, and deploy LLM-powered workflows and agents using an intuitive document-based interface — making AI application

Zep AI is a San Francisco-based AI context engineering platform — backed by Y Combinator (W24) with $3.3 million raised from Engineering Capital, Step Function, and investors from Vercel and Google —