Anki is a free and open-source software that utilizes a Spaced Repetition System (SRS) and is available for both computers and mobile devices. It offers a versatile platform for studying foreign languages, providing access to over 80 million user-generated flashcards. Users can also create their own custom flashcards or combine both approaches to suit their learning needs. Anki’s advanced algorithm tracks your progress with each vocabulary item, identifying which words require more frequent review to ensure mastery, while allowing less critical terms to be revisited at a later time.