SigmaOS
by SigmaOS
SigmaOS is a macOS-focused browser organized around workspaces and vertical tabs. It later added AI features such as Airis for asking questions, summarizing pages, and assisting with web-based research.
Why Abandoned
SigmaOS announced in November 2024 that it was joining The Browser Company and said SigmaOS would remain available until the end of January 2025. The homepage may still resolve, but its availability and support after that stated cutoff are unclear.
🩺 Health Signals
- HTTP Status
- 200
- Response
- —
- SSL
- —
- Confidence
- 84%
- Domain expires
- —
- Last content change
- —
- Last tweet
- —
- API status
- —
📅 Timeline
Seed funding announced
TechCrunch reported that SigmaOS raised a $4 million seed round led by LocalGlobe and Mosaic Ventures for its macOS browser.
Airis AI assistant introduced
SigmaOS announced Airis, an AI browser companion designed to answer questions and work with information on webpages.
Team joined The Browser Company
SigmaOS announced that its team was joining The Browser Company, maker of Arc, while stating that SigmaOS would stay available until the end of January 2025.
Announced availability window ended
This marks the end of the January 2025 availability period stated in SigmaOS's announcement; the product's exact subsequent operating state is not independently clear.
🔄 Alternatives to SigmaOS
Perplexity AI
🟢ActiveAI-powered answer engine that provides cited, real-time answers to complex questions.
You.com
🟢ActiveAI search engine offering summarized answers with source citations and app integrations.
ChatGPT
🟢ActiveOpenAI's conversational AI assistant that sparked the generative AI revolution.
Bard / Gemini
🟢ActiveGoogle's AI assistant, originally Bard, rebranded to Gemini with multimodal capabilities.
🪦 Other dead AI Browsers tools
OpenAI Operator
🔴Shutdown / DeadOperator was OpenAI’s browser-using research-preview agent for completing web tasks through a visual browser. Its core capabilities were later integrated into ChatGPT agent mode, and the standalone Operator site was sunset.
Mighty
🟡Acquired / MergedMighty was a Chromium-based web browser that streamed browser workloads from cloud servers to users’ computers. The company later pivoted to an AI product before its team joined Google in 2023.
❓ Frequently Asked Questions
What is SigmaOS?
SigmaOS is a macOS-oriented productivity browser that uses workspaces, vertical tabs, split-screen browsing, and keyboard-driven navigation. It later incorporated Airis, an AI assistant for interacting with webpages.
Is SigmaOS still available?
Its current availability is uncertain. SigmaOS said in November 2024 that the browser would remain available until the end of January 2025 as its team joined The Browser Company. Users should check the official site and app availability for the latest status.
What is SigmaOS Airis?
Airis is SigmaOS's built-in AI browser assistant. It was presented as a way to ask questions about pages, summarize or explain web content, and assist with research while browsing.
Who founded SigmaOS?
SigmaOS was founded by Mahyad Ghassemi, who developed the browser around a workspace-based approach to web productivity.
What are the best SigmaOS alternatives?
Catalogue-listed alternatives include Perplexity AI and You.com for AI-assisted search and browsing, plus ChatGPT and Gemini for general web-connected AI research and assistance.