Open-source Quizlet alternatives

Anki is a flashcard program built on spaced repetition. You build decks of cards, rate how well you recalled each one, and Anki schedules the next review for the moment you are most likely to forget, so time goes to the difficult material. The desktop source code lives in this repository, written mainly in Rust, and the project is open source with community contributions.

Cards can include audio, images, video and scientific markup, and both layouts and review timing can be customized. The homepage says decks of more than 100,000 cards work without trouble, and add-ons extend the program with new features. The free AnkiWeb service synchronizes your collection across devices. Anki Betas let non-developers try development builds. The repository metadata lists the license as Other, so check the LICENSE file for the exact terms.

AnkiDroid is a semi-official port of Anki, the open-source spaced repetition flashcard system, to Android. It lets people study flashcards on their phones and tablets, with the scheduling logic of spaced repetition deciding when each card is shown again so that material is remembered longer.

The app supports text, images, sounds and MathJax in cards, can sync with AnkiWeb, and includes a whiteboard, night mode, a progress widget and detailed statistics. It offers optional typed answers, text-to-speech integration and the AI-optimized FSRS algorithm for scheduling. More than 10,000 premade decks are available, and cards can be added from other apps, such as dictionaries, through Android intents.

AnkiDroid is written in Kotlin and released under GPL-3.0. Users can consult the user manual and wiki for help, and contributions in the form of beta testing, translation or code are welcome. The README lists a signing certificate fingerprint so that APK downloads can be verified, and credits many translators for broad language coverage.