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FBReader vs Komelia: catalog facts
FBReader	Komelia
Freemium The reader is free. Some format plugins and premium features are paid.	Free Free, with source code published on GitHub.
Windows, macOS, Linux, Android, iOS	Android
Same library and reading position across desktop and mobile Reads custom OPDS catalogues as well as local files	Dedicated reader for Komga libraries Includes an EPUB reader alongside comics
Some features and formats need paid add-ons The desktop builds lag the mobile apps	Requires a Komga server to be useful Smaller project with a limited user base
Downloadable app	Downloadable app
Closed source	Closed source
License not stated	License not stated
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked September 24, 2026

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