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Kalba vs Readlang: catalog facts
Kalba	Readlang
Free Free and open source under GPL-3.0.	Freemium Free to start, with paid plans available.
Linux	Web, Browser extension
Accepts text from websites, files, and the clipboard Fetches definitions and grammar details	Click-to-translate on any text or website Translated words saved automatically as flashcards
The project describes the software as alpha	Best suited to learners who can already read simple texts Some features require a paid plan
Downloadable app	Web application, Browser extension
Open source	Closed source
License: GPL-3.0	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 8, 2026	Official website Full listing and sources Checked September 23, 2026

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