Organize by Collection

Build collections of flashcards on any topic.

Combine into Study Sets

Interleave cards from multiple collections in a single study set. Interleaving increases retention.

Algorithm-Driven Study

The algorithm picks the next card to study.

Tune Your Study

Fine-tune how you study.

Here, a Learning card graduates to Review after 3 consecutive correct answers. Sessions pull in up to 10 new cards with a 30-card ceiling.

Dial In Your Repetition

Choose your review spacing.

Review cards progress through review stages. Each stage spaces out the next review. For example, if you graduate a Learning card to Review on Monday, it reappears Tuesday (1 day). Pass again, and it returns Friday (3 days). Then the following Friday (7 days). A correct answer advances the card to the next stage. An incorrect answer demotes it to the previous stage, or back to Learning if already at the first. After the final stage, the card is archived.

The Science

Without review, you forget most of what you learn within days. This rapid decay is called the forgetting curve. Spaced repetition beats it by scheduling reviews at increasing intervals, right before you're about to forget. Each review strengthens the memory and pushes the next one further out.

Interleaving — mixing cards from different topics in a single session — forces your brain to practice retrieving and distinguishing concepts, which builds more resilient memory than studying one topic at a time.