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Bookaccio vs Sobuu: catalog facts
Bookaccio	Sobuu
Free Free and open source under the GPL-3.0.	Free Free and open source under the Apache-2.0 licence, with no ads.
Android	Android
Book search through the Google Books API Reading progress tracking	Page-by-page reading progress and reading time Comments tied to a page so others avoid spoilers
Book search depends on the Google Books API Android only	Android only Social features depend on other readers using the app
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0-only	License: Apache-2.0
Not stated if an account is needed	No account needed
Not stated if it works offline	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.