LingQ is an online language learning platform that helps learners of all levels improve their language skills. The platform provides users with a variety of learning tools and resources, including flashcards, audio lessons, lessons written by native speakers, and an interactive spaced repetition system. It also offers a social learning experience, where users can interact with native speakers and other learners from all over the world. LingQ is available on both web and mobile and allows users to learn more than 20 languages.
It is free. It has mostly the same functionality. It allows you to read text with almost instant word search. Word sorting works in the same way as LingQ. The other alternatives are mostly just memorization with spaced repetition, which is a very minor feature of LingQ.