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RedNotebook vs Penzu: catalog facts
RedNotebook	Penzu
Free The open-source software is available without a license fee. Hosting, hardware and…	Free Free to start, with unlimited entries at no cost.
Windows, Linux	Android, iOS, Web
Supports tags, templates, images and document exports.	Unlimited entries on the free plan Encryption and per-entry or per-journal locking
It is a local journal rather than a collaborative workspace.	Journals are stored on Penzu's service rather than in files you own Built for journaling, not general note-taking
Downloadable app	Downloadable app, Web application, Hosted service
Open source	Closed source
License: GPL-2.0	License not stated
Not stated if an account is needed	Account needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked October 2, 2026

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