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Kotoba vs Yomitan: catalog facts
Kotoba	Yomitan
Free Free and open source under the GPL-3.0-or-later licence.	Free Free and open source.
Linux	Browser extension
Native GTK and libadwaita interface Written in Rust	Instant hover lookups without leaving the page Continues Yomichan with active maintenance
Very young project, created in 2026 Linux 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
Not stated if it works offline	Works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked October 1, 2026

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