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Episteme Reader vs Moon+ Reader: catalog facts
Episteme Reader	Moon+ Reader
Free Free and open source under the AGPL-3.0.	Freemium Free version available, with a paid Pro version.
Android, iOS	Android
Reads PDF, EPUB, MOBI and AZW3 in one app Also opens Markdown, HTML and plain text	Very wide format support including Markdown and CHM Reads books inside ZIP and RAR archives and OPDS catalogs
Desktop and iOS versions are not confirmed as released Contributions require signing a CLA	Android only Some features require the paid Pro version
Downloadable app	Downloadable app
Open source	Closed source
License: AGPL-3.0	License not stated
Not stated if an account is needed	Not stated if an account is needed
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 September 23, 2026

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