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Perplexity Comet vs Sigma AI Browser: catalog facts
Perplexity Comet	Sigma AI Browser
Freemium A free tier is available. Full agent features require a Perplexity subscription.	Free Described by the developer as a free browser.
Windows, macOS	Windows, macOS, Android, iOS
Assistant can act on pages, not only summarise them	Built-in AI agent that acts on web pages Local Eclipse LLM keeps prompts on the device
Requires a Perplexity account, and an agent acting on logged-in sites carries real risk Closed source	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
Account 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 September 22, 2026	Official website Full listing and sources Checked October 2, 2026

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