Compare software

Sigma AI Browser vs Perplexity Comet: catalog facts
Sigma AI Browser	Perplexity Comet
Free Described by the developer as a free browser.	Freemium A free tier is available. Full agent features require a Perplexity subscription.
Windows, macOS, Android, iOS	Windows, macOS
Built-in AI agent that acts on web pages Local Eclipse LLM keeps prompts on the device	Assistant can act on pages, not only summarise them
Cloud AI features send data off the device Developer and licensing details are not clearly stated	Requires a Perplexity account, and an agent acting on logged-in sites carries real risk Closed source
Downloadable app	Downloadable app
Closed source	Closed source
License not stated	License not stated
Not stated if an account is needed	Account 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 September 22, 2026

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