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Kalba vs LingQ: catalog facts
Kalba	LingQ
Free Free and open source under GPL-3.0.	Freemium Free sign-up, with paid plans listed on the pricing page.
Linux	Web, Browser extension
Accepts text from websites, files, and the clipboard Fetches definitions and grammar details	Learning from real books, podcasts and shows Tracks vocabulary as you read
The project describes the software as alpha	Requires an account Full use depends on 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	Account 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.