An AI tutor for anything you want to understand. It checks what you already know, teaches one idea at a time with formulas and figures, and brings ideas back before you forget. On Mac, iPhone, and iPad, in English, Japanese, German, and Chinese.
Each idea comes with an explanation, formulas, and figures, then a short check that you can explain it yourself.
A few quick questions, with how sure you are, find the gaps before it teaches.
Every idea you learn lights up as a star, and related ideas join into constellations.
Ideas come back on a spaced schedule, just before you forget them.
