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

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