This app helps you actively recall words you would like to learn by following the concept called the "forgetting curve", using spaced repetition technique.
Learn more about it on spaced repetition Wikipedia page, or watch this brief video on spaced repetition and why it works.
This app allows you to review all the words you have learned (on the "Learned Words" page), as well as the words you still need to learn (on the "Your Words" page).
The main function of the app is to repeat words based on the above explanation. The page dedicated to that purpose is called "Recall."
You will receive an email when it's time to recall certain words.
There are five rounds of repetition, and each time you will grade how well you have remembered a word. Repetitions will reset if you mark a word as not recalled well enough, using a rating scale from 0 to 5. Any rating below 3 (0, 1, or 2) is considered "not good enough."