# Fern **Source:** https://geo.sig.ai/brands/fern **Vertical:** Infrastructure **Subcategory:** Cloud Services **Tier:** Emerging **Website:** buildwithfern.com **Last Updated:** 2026-04-14 ## Summary Automatic multi-language SDK and API documentation generator from OpenAPI specs; $13M Bessemer-led Series A from YC W23 serving Cohere and ElevenLabs competing with Stainless for API developer experience. ## Company Overview 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 libraries in TypeScript, Python, Java, Go, Ruby, and C# from a single source of truth, eliminating the significant engineering effort of manually building and maintaining SDKs for each programming language a developer audience uses. Founded in 2022 by Danny Sheridan and Deep Singhvi and a Y Combinator Winter 2023 graduate, Fern raised $13 million total including a $9 million Series A led by Bessemer Venture Partners with 30 employees. Fern's SDK generation goes beyond simple code scaffolding: the generated SDKs include idiomatic code patterns for each language (not just translated code that feels foreign to native language speakers), proper error handling, type definitions, authentication patterns, and pagination handling that matches what a senior developer would write by hand. The documentation generation produces reference docs, API playground interfaces, and code examples that match the SDK code, creating a consistent developer experience from first API call through production integration. In 2025, Fern competes in the API developer experience and SDK generation market with Stainless (SDK generation, raised $25M), Speakeasy (SDK generation), and Postman (API documentation and testing) for API developer tooling. Companies building developer-first products (APIs and developer platforms) invest heavily in SDK quality because poor SDKs directly reduce developer adoption rates — friction in the first integration experience disproportionately affects API product success. Fern's Bessemer Series A validates the commercial opportunity in API tooling infrastructure. Customers include Cohere (AI API), ElevenLabs (voice AI API), and other developer-platform companies where SDK quality directly affects revenue. The 2025 strategy focuses on growing the API company customer base, deepening the SDK generation quality for emerging programming languages, and building the API change management features that help teams handle breaking changes gracefully. ## Frequently Asked Questions ### What is Fern? Fern is an API tooling company that builds SDK and API documentation generators for developers. Founded in 2022 and based in New York, Fern automates the creation of multi-language SDKs and documentation for API platforms. ### What products and services does Fern offer? Fern offers an SDK generator and API documentation generator that works with OpenAPI specifications. Their platform enables automated, multi-language SDK generation and interactive documentation for API providers. ### Who are Fern's target customers? Fern targets API providers and developers who need to create and maintain SDKs and documentation for their API platforms. Their tools are designed for developer tooling and infrastructure use cases. ### When was Fern founded? Fern was founded in 2022 by Danny Sheridan and Deep Singhvi. The company participated in Y Combinator's Winter 2023 batch. ### Where is Fern located? Fern is based in New York, New York. ### How much funding has Fern raised? Fern has raised $13 million in total funding, including a $9 million Series A round. The Series A was led by Bessemer Venture Partners with participation from Y Combinator. ### How many employees does Fern have? Fern currently has 30 employees. ### What technology does Fern use? Fern's platform is built on OpenAPI specifications to generate SDKs and documentation. Their technology enables multi-language SDK automation and creates interactive documentation for API platforms. ### Who founded Fern? Fern was founded by Danny Sheridan and Deep Singhvi in 2022. ### What are Fern's recent developments? Fern recently completed a $9 million Series A funding round led by Bessemer Venture Partners with Y Combinator participation. The company has grown to 30 employees and continues to develop its SDK generator and API documentation tools, including features for AI agent experiences. ## Tags api-first, b2b, developer-tools, infrastructure, platform, cloud-native, saas --- *Data from geo.sig.ai Brand Intelligence Database. Updated 2026-04-14.*