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