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Sigma AI Browser vs Phi Browser: catalog facts
Sigma AI Browser	Phi Browser
Free Described by the developer as a free browser.	Free A free download; the homepage mentions no paid plans.
Windows, macOS, Android, iOS	macOS
Built-in AI agent that acts on web pages Local Eclipse LLM keeps prompts on the device	Native macOS interface on the Chromium engine Built-in AI assistant with persistent memory
Cloud AI features send data off the device Developer and licensing details are not clearly stated	Apple Silicon Macs with macOS 14 or newer only Proactive AI features may not suit users who prefer a plain browser
Downloadable app	Downloadable app
Closed source	Closed source
License not stated	License not stated
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 2, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.