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Openshelf vs Sobuu: catalog facts
Openshelf	Sobuu
Free Free and open source under the GPL-3.0 licence.	Free Free and open source under the Apache-2.0 licence, with no ads.
Android	Android
No account and data stays on the device Flexible organisation by category, collection and imprint	Page-by-page reading progress and reading time Comments tied to a page so others avoid spoilers
Android is the supported platform No cloud sync between devices	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
No account needed	No account needed
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.