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