ten feel-prototypes · 60–90 seconds each
These are feel prototypes, not products. No accounts, no saving — refresh resets everything. All ten draw from one shared pool of 56 real ACT/SAT math items, so what differs between them is the mechanic and nothing else.
A 90-second test measures arousal, not return. It will favour the arcade-y ones and punish the come-back-tomorrow ones. Read the ranking as "which directions are alive", not "which one to build".
Built for JD & Dad · SpeedPrep · Aug 2026