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Petal vs Open Notebook: catalog facts
Petal	Open Notebook
Freemium Free to start, with paid options for more use.	Free Free and open source under the MIT license.
Web	Web, Self-hosted
Answers cite the source documents Document storage with automatic metadata extraction	Privacy-focused self-hosted alternative to a well-known proprietary tool MIT licensed with an active Discord community
Documents are stored in Petal's cloud Requires an account	Local processing still depends on which model provider is configured Smaller community than the proprietary product it alternatives
Web application	Self-hosted, Web application
Closed source	Open source
License not stated	License: MIT
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 September 22, 2026

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