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Yomitan vs Kotoba: catalog facts
Yomitan	Kotoba
Free Free and open source.	Free Free and open source under the GPL-3.0-or-later licence.
Browser extension	Linux
Instant hover lookups without leaving the page Continues Yomichan with active maintenance	Native GTK and libadwaita interface Written in Rust
Dictionaries must be found and imported separately Setup takes some effort for new users	Very young project, created in 2026 Linux 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	Not stated if it 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.