Review with a due list, a forecast and five grades

Review brings back problems you solved so you rebuild the approach before you forget it. The page starts with what is due today, then a forecast of the next 14 days.

Each card asks you to recall the approach before you see your notes and hints. Grade the attempt Nothing, Something, Hard, Okay or Easy. Nothing and Something bring the problem back tomorrow; Hard grows the gap slowly, and Okay and Easy grow it further.

Review is free. It needs an account, because it keeps your own history, and new accounts start with it on.