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Quire vs KOReader: catalog facts
Quire	KOReader
Free Free and open source under the Apache-2.0 license.	Free Free and open source under the AGPL 3.0.
Android, Self-hosted	Linux, Android
Browses calibre-web libraries over OPDS Reading progress syncs to a server you run yourself	Runs on Kindle, Kobo, PocketBook, Cervantes and reMarkable hardware Opens PDF, DjVu, CBZ, EPUB, FB2, Mobi, DOC, RTF, HTML, CHM and TXT
Requires a calibre-web setup to be useful Young project with a small user base	Installing on a locked e-reader means jailbreaking it first, at your own risk The settings menus are deep and not self-explanatory
Downloadable app, Self-hosted	Downloadable app
Open source	Open source
License: Apache-2.0	License: AGPL-3.0
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 September 21, 2026

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