Don’t you know when you should review? Don’t you feel like reviewing over and over? Can’t you memorize even if you review repeatedly? The app automatically notifies you of reviews at the best timing based on the forgetting curve. You can easily learn it by simply reviewing it when you get a notification from the app. The idea of “forgetting curve” is proved by Hermann Ebbinghaus, a famous German experimental psychologist, born in 1850. Ebbinghaus theorized that the human brain will forget info