The best free alternative to Quizlet is Anki, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 50 alternatives to Quizlet and loads of them is free so hopefully you can find a suitable replacement. Other interesting free alternatives to Quizlet are Memrise (Freemium), AnkiDroid (Free, Open Source), RemNote (Freemium) and Mochi (Freemium).
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