Fundraising Fox

SigmaOS

YC S21

San 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.

MGMahyad Ghassemi
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.
AAAli Attar
Ali Attarin𝕏Founder / CPOAli Attar is the founder of Lightberry, a company in the F25 batch.
SMSaurav Mitra
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.
MG
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.