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