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Phi Browser vs Sigma AI Browser: catalog facts
Phi Browser	Sigma AI Browser
Free A free download; the homepage mentions no paid plans.	Free Described by the developer as a free browser.
macOS	Windows, macOS, Android, iOS
Native macOS interface on the Chromium engine Built-in AI assistant with persistent memory	Built-in AI agent that acts on web pages Local Eclipse LLM keeps prompts on the device
Apple Silicon Macs with macOS 14 or newer only Proactive AI features may not suit users who prefer a plain browser	Cloud AI features send data off the device Developer and licensing details are not clearly stated
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.