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Actionbook vs Nanobrowser: catalog facts
Actionbook	Nanobrowser
Free Free and open source under the Apache-2.0 license.	Free Free and open source; you pay your chosen LLM provider for API usage.
Command line, Browser extension	Browser extension
Automates browser interactions for AI agents Can retrieve sources behind logins and paywalls	Runs inside your own browser Bring your own LLM API key
Designed for use by AI agents	Needs a paid API key from a model provider Chrome-focused
Downloadable app, Browser extension	Browser extension
Open source	Open source
License: Apache-2.0	License not stated
Not stated if an account is needed	No account needed
Not stated if it works offline	Needs internet
Official website Full listing and sources Checked October 8, 2026	Official website Full listing and sources Checked September 26, 2026

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