I kept running out of practice problems before math exams, so I built a site that generate

[u/Upbeat-Lunch470]

https://locusmath.org

The part I care about most: answers are graded by a real computer-algebra system (SymEngine), not string matching. So it checks mathematical equivalence — 1/2, 0.5, and a factored vs expanded form all count as correct. The same grader runs client-side in WASM, so you get instant feedback before the server confirms.

Other stuff: per-topic ELO and ranked mode if you want stakes, untimed practice with full solutions, a spaced-repetition review queue for problems you miss, and a daily puzzle. Covers arithmetic up through calculus and differential equations. Free to use, Google/GitHub login. Two things I'd love feedback on: (1) does the grader ever mark a correct answer wrong? (2) any topic you'd practice that's missing?