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