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TachiyomiSY vs Usagi: catalog facts
TachiyomiSY	Usagi
Free Free and open source.	Free Free and open source under GPL-3.0-only.
Android	Android
Adds features beyond the upstream Mihon reader Familiar interface for existing Tachiyomi and Mihon users	Built-in tunnels to reach sources behind firewalls Several interface styles, including Modern and Classic
Android only Not distributed through the Play Store	Android only Content depends on third-party online sources
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
Not stated if it 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.