Very interesting project, since it combines an authoring tool for teachers, printable worksheet generator functionality, and "quiz tool" for students to use.<p>The random problem generation functionality in particular is very powerful. It reminds me to the random problem generation API in the khan-exercises framework, but with a different interface. Instead of requiring teachers to learn JavaScript to generate problems, they just have to learn how to use the problem generators for different type of problems. Generating generators for <i>all</i> kinds of math problems will be a lot of work, still, it's nice to see a new take on the problem.<p>Another promising project in the same space is <a href="https://ximera.osu.edu/" rel="nofollow">https://ximera.osu.edu/</a> [latex --> (js,pdf) exercise generator]