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Perplexity Comet vs Nanobrowser: catalog facts
Perplexity Comet	Nanobrowser
Freemium A free tier is available. Full agent features require a Perplexity subscription.	Free Free and open source; you pay your chosen LLM provider for API usage.
Windows, macOS	Browser extension
Assistant can act on pages, not only summarise them	Runs inside your own browser Bring your own LLM API key
Requires a Perplexity account, and an agent acting on logged-in sites carries real risk Closed source	Needs a paid API key from a model provider Chrome-focused
Downloadable app	Browser extension
Closed source	Open source
License not stated	License not stated
Account needed	No account needed
Not stated if it works offline	Needs internet
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked September 26, 2026

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