You are shown a question. Try to answer it in your head, then tap the card to see whether you were right, and say how it went.

Again means you did not know it. Hard means you got there, slowly. Good means you knew it. Easy means it was obvious. Be honest — the app uses your answer to decide when to show the card next, so flattering yourself just means seeing it less.

Cards you find hard come back within minutes. Cards you know come back in days, then weeks. That is the whole trick: you spend your time on the material you have not learned yet.

Nothing is uploaded. Your progress is stored in this browser, so back it up from the Progress tab before you change phone.