Daily practice
Twenty questions at most. What you miss returns tomorrow; what you know returns in days, then weeks.
Move your progress to another device
Copy the text below and paste it into the same box on the other device, then press Import. Nothing is uploaded anywhere.
How it schedules
Each card sits in a box from 0 to 5. A right answer moves it up and sets the next review one day, two, five, twelve or thirty days away. A wrong answer sends it back to box 0 and it returns in the same session.