Anki is a powerful, open-source flashcard program renowned for its effective spaced repetition system (SRS). It isn't a language course itself, but a highly effective tool for memorizing vocabulary, phrases, or grammar rules that you input yourself or download from shared user-created decks. Its high degree of customization allows for rich cards with audio, images, and cloze deletions. While its interface can be unintuitive for new users, its effectiveness for long-term retention is largely considered unparalleled for dedicated learners.

Yabla immerses learners in the language through a vast library of authentic videos, including everything from TV shows and music videos to interviews. Its standout feature is a unique video player with clickable, dual-language subtitles, slow-motion playback, and looping functions that make native-level content accessible. Integrated games reinforce vocabulary and comprehension from the videos. It is an exceptional tool for intermediate to advanced learners looking to sharpen their listening skills, but it is not a structured, A-to-Z course for beginners.