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Kotoba vs 10ten Japanese Reader: catalog facts
Kotoba	10ten Japanese Reader
Free Free and open source under the GPL-3.0-or-later licence.	Free Free to use; source code is published on GitHub.
Linux	Browser extension
Native GTK and libadwaita interface Written in Rust	Translations appear on hover without leaving the page Actively developed with frequent commits
Very young project, created in 2026 Linux only	Only helps with Japanese text Works inside the browser, not in other desktop apps
Downloadable app	Browser extension
Open source	Closed source
License: GPL-3.0-or-later	License not stated
Not stated if an account is needed	Not stated if an account is 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.