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Kotoba vs Kiten: catalog facts
Kotoba	Kiten
Free Free and open source under the GPL-3.0-or-later licence.	Free Free and open source under the GPL-2.0-or-later licence.
Linux	Windows, Linux
Native GTK and libadwaita interface Written in Rust	English-Japanese and Japanese-English dictionaries Kanji dictionary with several lookup methods
Very young project, created in 2026 Linux only	Built around KDE, so it looks most at home on a Plasma desktop Focused on lookup rather than structured lessons
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0-or-later	License: GPL-2.0-or-later
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 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.