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Calibre-Web Companion vs Quire: catalog facts
Calibre-Web Companion	Quire
Free Free and open source under the GPL-3.0.	Free Free and open source under the Apache-2.0 license.
Android	Android, Self-hosted
Native mobile interface for Calibre-Web Supports Calibre-Web Automated	Browses calibre-web libraries over OPDS Reading progress syncs to a server you run yourself
Requires your own Calibre-Web server Unofficial, not made by the Calibre-Web developers	Requires a calibre-web setup to be useful Young project with a small user base
Downloadable app	Downloadable app, Self-hosted
Open source	Open source
License: GPL-3.0	License: Apache-2.0
Account needed	Not stated if an account is needed
Not stated if it 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.