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Pitak vs Inventaire: catalog facts
Pitak	Inventaire
Free Free and open source under the GPL 3.0 or later.	Free Free to use and open source under the AGPL-3.0 licence.
Android	Web, Self-hosted
Works fully offline Lending records kept in an encrypted vault	Book data from ISBNs and Wikidata Share a library with friends and communities
Very young project with few users Catalogues physical books rather than reading ebooks	Focused on books only Covers physical books rather than ebook files
Downloadable app	Web application, Self-hosted
Open source	Open source
License: GPL-3.0-or-later	License: AGPL-3.0
No account needed	Not stated if an account is needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 2, 2026

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