SigmaOS
YC S21San Francisco, US · Founded 2021 · 5 employees · Hiring · 4 known investors
SigmaOS is a macOS web browser that organizes tabs into workspaces and includes AI-powered features like website summarization and contextual search. It targets students, founders, and creatives seeking improved productivity and focus.
ConsumerDeveloper ToolsSaaSProductivityCollaborationUnited States of AmericaUnited KingdomAmerica / CanadaEurope
Founders & leadership· Y Combinator alumni (S21)
SigmaOS was founded in 2021 by Mahyad Ghassemi, Ali Attar, Saurav Mitra, and Mahyad Ghassemibouyaghchi.
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Mahyad Ghassemiin𝕏Founder / CEOMahyad Ghassemi is a two-time Y Combinator founder who previously built SigmaOS, a web browser designed for AI agent workflows that reached over 100,000 users. He currently develops tools for creating AI coworkers through natural language interfaces.
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Saurav Mitrain𝕏Founder / CTOSaurav Mitra previously founded SigmaOS, an AI browser with over 100,000 users. He is now building Okibi, a platform for creating AI agents through natural language interfaces.
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Mahyad GhassemibouyaghchiFounder
Investors · 4
Founder mafia
3 people who came through SigmaOS went on to found or lead other companies.
In the news
Frequently asked questions
- What does SigmaOS do?
- SigmaOS is a macOS web browser that organizes tabs into workspaces and includes AI-powered features like website summarization and contextual search. It targets students, founders, and creatives seeking improved productivity and focus.
- Who founded SigmaOS?
- SigmaOS was founded by Mahyad Ghassemi, Ali Attar, Saurav Mitra, Mahyad Ghassemibouyaghchi in 2021.
- Who are SigmaOS's investors?
- SigmaOS's investors include Moonfire Ventures, Y Combinator, 7percent Ventures, LocalGlobe.
- Where is SigmaOS headquartered?
- SigmaOS is headquartered in San Francisco, US.




