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KOReader vs Quire: catalog facts
KOReader	Quire
Free Free and open source under the AGPL 3.0.	Free Free and open source under the Apache-2.0 license.
Linux, Android	Android, Self-hosted
Runs on Kindle, Kobo, PocketBook, Cervantes and reMarkable hardware Opens PDF, DjVu, CBZ, EPUB, FB2, Mobi, DOC, RTF, HTML, CHM and TXT	Browses calibre-web libraries over OPDS Reading progress syncs to a server you run yourself
Installing on a locked e-reader means jailbreaking it first, at your own risk The settings menus are deep and not self-explanatory	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: AGPL-3.0	License: Apache-2.0
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 September 21, 2026	Official website Full listing and sources Checked October 2, 2026

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