What happens to a word after you save it, and why the app asks about it when it does.
After seeing the answer, you tap one of three buttons. Your choice tells the algorithm exactly how well you remembered.
Each correct answer multiplies your review interval by a personal ease factor. The better you know a word, the longer before you see it again.
Your review interval determines your mastery level. As intervals grow, you progress through six stages — from first encounter to fully mastered.
The result: you spend time on words you're about to forget, not words you already know. No manual scheduling, no guesswork — just science.