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Sumatora Dictionary vs Yomitan: catalog facts
Sumatora Dictionary	Yomitan
Free Free and open source under GPL-3.0-or-later.	Free Free and open source.
Android	Browser extension
Searches Japanese in romaji, hiragana and katakana Supports nine search languages	Instant hover lookups without leaving the page Continues Yomichan with active maintenance
Android app only	Dictionaries must be found and imported separately Setup takes some effort for new users
Downloadable app	Browser extension
Open source	Open source
License: GPL-3.0-or-later	License: GPL-3.0
Not stated if an account is needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked October 8, 2026	Official website Full listing and sources Checked October 1, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.