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