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SuperMemo is the original software based on the spaced repetition system (SRS) algorithm, designed for maximum efficiency in long-term memorization. It is not a pre-made course but a powerful tool that allows you to create your own flashcards and learning materials. It is renowned for the effectiveness of its algorithm but also notorious for its steep learning curve and dated user interface. This tool is best for highly dedicated, self-directed learners who want ultimate control over their study material.
FluentU uses authentic video content—such as music videos, commercials, and news clips—as its foundation for language lessons. The platform features interactive subtitles that allow users to click on any word for a definition, example sentences, and pronunciation. New vocabulary can be saved as flashcards, which are then reinforced through personalized quizzes. While it offers a method for learning vocabulary in context and improving listening skills, it does not provide explicit grammar instruction or speaking practice.