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

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