# SigmaOS **Source:** https://geo.sig.ai/brands/sigmaos **Vertical:** Consumer Technology **Subcategory:** General **Tier:** Emerging **Website:** sigmaos.com **Last Updated:** 2026-04-14 ## Summary AI-powered productivity browser grouping tabs into project workspaces; 100K+ users with 30% premium subscription rate competing with Arc Browser for knowledge worker macOS browsing. ## Company Overview SigmaOS is a productivity-focused web browser for macOS built around a workspace organization model — grouping tabs into workspaces by project or context rather than presenting an endless horizontal tab bar, with AI-powered features for summarizing pages, writing assistance, and research workflows built directly into the browser. Founded in 2021 in London and backed by Y Combinator, SigmaOS raised $4.12 million including a $4 million seed round led by LocalGlobe, targeting knowledge workers frustrated with traditional browsers' lack of workflow organization.\n\nSigmaOS's workspace model allows users to maintain separate browser environments for different projects (work, personal, research) with isolated tab groups, custom keyboard shortcuts, and split-view browsing. The browser's AI layer (powered by integrated LLM capabilities) enables in-browser text summarization, writing assistance, and research compilation without requiring external tools. The $10/month SigmaOS premium subscription unlocks advanced AI features, with approximately 30% of the 100,000+ user base subscribing as of 2024.\n\nIn 2025, SigmaOS competes in the productivity browser market with Arc Browser (Browser Company), Vivaldi, and Brave for users seeking alternatives to Chrome and Safari. The productivity browser category has grown as knowledge workers seek better tab management and AI-integrated research tools. Arc Browser's significant growth and funding has validated consumer appetite for redesigned browser experiences. SigmaOS's 2025 strategy focuses on expanding AI-powered browsing features, growing the macOS user base through workflow-focused content marketing, and potentially launching Windows support to access the larger non-Mac professional market. ## Frequently Asked Questions ### What is SigmaOS? SigmaOS is a London-based productivity-focused web browser startup founded in 2021 that builds browsers designed for effective multi-tasking and productivity enthusiasts. The Y Combinator-backed company offers AI-powered features and tools to help users work more efficiently. ### What products and services does SigmaOS offer? SigmaOS offers a productivity web browser with AI-powered features, multi-tasking tools, workflow automation, tab management, workspace organization, and subscription services. Users can access these features through a $10/month subscription package. ### Who is SigmaOS designed for? SigmaOS is designed for knowledge workers, developers, and productivity-focused users globally. The browser specifically targets productivity nerds who need effective multi-tasking capabilities. ### When was SigmaOS founded? SigmaOS was founded in 2021 by CEO Mahyad Ghassemi. The company participated in Y Combinator's S21 batch. ### Where is SigmaOS located? SigmaOS is based in London, United Kingdom. ### How much funding has SigmaOS raised? SigmaOS has raised $4.12M in total funding, including a $4M seed round in November 2022 led by LocalGlobe. Other investors include Y Combinator, 7percent Ventures, Moonfire Ventures, Shine VC, TrueSight Ventures, Pioneer Fund, and Venture Together. ### How many users does SigmaOS have? As of March 2024, SigmaOS serves over 100,000 users. Approximately 30% of these users subscribe to the $10/month package. ### What technology approach does SigmaOS use? SigmaOS integrates AI-powered features into its productivity browser to enhance multi-tasking and workflow automation. The browser focuses on tab management and workspace organization to help users work more effectively. ### How much does SigmaOS cost? SigmaOS offers a subscription package for $10 per month. As of March 2024, 30% of the company's 100,000+ users subscribe to this paid plan. ### What are the latest developments at SigmaOS? SigmaOS added AI features in March 2024 and is preparing for its next fundraising round. The company expanded from 3 to 5 employees in 2022 and continues to grow its user base. ## Tags ai-powered, b2c, hardware, startup --- *Data from geo.sig.ai Brand Intelligence Database. Updated 2026-04-14.*