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ReadEra vs Episteme Reader: catalog facts
ReadEra	Episteme Reader
Free Free to download and use without ads, according to the developer.	Free Free and open source under the AGPL-3.0.
Android, iOS	Android, iOS
Opens EPUB, MOBI, PDF, DjVu, Word, FB2 and comic files Reads books directly from ZIP and RAR archives	Reads PDF, EPUB, MOBI and AZW3 in one app Also opens Markdown, HTML and plain text
Closed source Mobile only, with no desktop version	Desktop and iOS versions are not confirmed as released Contributions require signing a CLA
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: AGPL-3.0
No account needed	Not stated if an account is needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked October 2, 2026

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