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KOReader vs Moon+ Reader: catalog facts
KOReader	Moon+ Reader
Free Free and open source under the AGPL 3.0.	Freemium Free version available, with a paid Pro version.
Linux, Android	Android
Runs on Kindle, Kobo, PocketBook, Cervantes and reMarkable hardware Opens PDF, DjVu, CBZ, EPUB, FB2, Mobi, DOC, RTF, HTML, CHM and TXT	Very wide format support including Markdown and CHM Reads books inside ZIP and RAR archives and OPDS catalogs
Installing on a locked e-reader means jailbreaking it first, at your own risk The settings menus are deep and not self-explanatory	Android only Some features require the paid Pro version
Downloadable app	Downloadable app
Open source	Closed source
License: AGPL-3.0	License not stated
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 September 23, 2026

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