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

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