Compare software

Readlang vs Kalba: catalog facts
Readlang	Kalba
Freemium Free to start, with paid plans available.	Free Free and open source under GPL-3.0.
Web, Browser extension	Linux
Click-to-translate on any text or website Translated words saved automatically as flashcards	Accepts text from websites, files, and the clipboard Fetches definitions and grammar details
Best suited to learners who can already read simple texts Some features require a paid plan	The project describes the software as alpha
Web application, Browser extension	Downloadable app
Closed source	Open source
License not stated	License: GPL-3.0
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 September 23, 2026	Official website Full listing and sources Checked October 8, 2026

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