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Nanobrowser vs Actionbook: catalog facts
Nanobrowser	Actionbook
Free Free and open source; you pay your chosen LLM provider for API usage.	Free Free and open source under the Apache-2.0 license.
Browser extension	Command line, Browser extension
Runs inside your own browser Bring your own LLM API key	Automates browser interactions for AI agents Can retrieve sources behind logins and paywalls
Needs a paid API key from a model provider Chrome-focused	Designed for use by AI agents
Browser extension	Downloadable app, Browser extension
Open source	Open source
License not stated	License: Apache-2.0
No account needed	Not stated if an account is 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 October 8, 2026

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