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Nanobrowser vs HARPA AI: catalog facts
Nanobrowser	HARPA AI
Free Free and open source; you pay your chosen LLM provider for API usage.	Freemium Free to install, with paid plans for heavier use of hosted models.
Browser extension	Browser extension
Runs inside your own browser Bring your own LLM API key	Works with many AI providers and local models YouTube, PDF and page summaries in place
Needs a paid API key from a model provider Chrome-focused	Mainly a Chrome extension Hosted models send page content to third-party AI providers
Browser extension	Browser extension
Open source	Closed source
License not stated	License not stated
No account needed	Not stated if an account is needed
Needs internet	Needs internet
Official website Full listing and sources Checked September 26, 2026	Official website Full listing and sources Checked September 23, 2026

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