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Sobuu vs Bookaccio: catalog facts
Sobuu	Bookaccio
Free Free and open source under the Apache-2.0 licence, with no ads.	Free Free and open source under the GPL-3.0.
Android	Android
Page-by-page reading progress and reading time Comments tied to a page so others avoid spoilers	Book search through the Google Books API Reading progress tracking
Android only Social features depend on other readers using the app	Book search depends on the Google Books API Android only
Downloadable app	Downloadable app
Open source	Open source
License: Apache-2.0	License: GPL-3.0-only
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 October 2, 2026	Official website Full listing and sources Checked October 2, 2026

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