Humans forget newly learned material in a matter of days (red curve) unless reviewed from time to time (green curves).
Humans more easily remember items when they are studied a few times spaced over a long time span
than when studied repeatedly in a short period of time.
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Spaced repetition is a learning technique in which items are reviewed in increasing intervals of time
to make most use of the spacing effect so that they can be remembered effectively and efficiently.
It is especially well suited for memorizing huge amounts of material and keeping them indefinitely in memory.
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No installation. No synchronization between smartphone and web. Directly access your cards with a simple, modern web application on an Android, iPhone, iPad, Mac, or PC.
Create your own decks to memorize anything from vocabulary and foreign languages to chemical symbols and programming language APIs. Or simply select a deck from the official decks list, which includes decks for Kanji, English vocabulary, programming language APIs, and more.
The key to memorizing is repetition. With access from your smartphone, review your cards when you have a bit of spare time, anywhere.
With Spaced Repetition, the repetition interval is automatically adjusted based on whether you've remembered the card or not, so you spend time on those that need it, and less on the ones you have memorized.
Handwrite your answers directly on screen to precisely test your memory and to help you memorize better. Standard keyboard input is also supported.
Add images to your cards to memorize maps, pictures, and drawings.
Add links to websites with detailed information or format your cards as you like by creating your card text in Markdown.
If you have cards in another system or a file containing card data, simply import them with a CSV file. Or use Excel or your favorite editor to create cards and import them with a few clicks.