Most apps teach you something and move on. Erudia keeps track of every concept you've studied and schedules a review right before you'd forget it. A few minutes a day, and the math stays with you.
No credit card. Begins with a quick check to find where you already are.
You don't forget because you're bad at math. You forget because nothing brought it back.
Cramming feels productive and disappears in a week. Erudia schedules every concept on a forgetting curve, so five minutes of review today saves you from relearning a whole chapter next month.
Short lessons built around interactive widgets you can drag and adjust, not videos to sit through. You see what a concept does before you're asked to use it.
Miss a question and it tells you what went wrong: a sign error, an off-by-one, a missing step. Then it brings that skill back until it holds.
The engine estimates when each skill is about to fade and brings it back right then. Your time goes to what's slipping, not what you already know.
Every skill is linked to the ones it depends on, so you can start anywhere and always know what comes next.
An FSRS spaced-repetition engine tracks the strength of every skill and times reviews to your personal forgetting curve — so a review lands the day before you'd have lost it, not weeks too late.
Hundreds of skills wired by prerequisite. Nothing unlocks before its foundation, and gaps get caught before they compound.
A short diagnostic finds what you already know, so you skip what you've covered and start where it's useful.
Drag a vector, sweep an angle, watch a Riemann sum converge. You build intuition by doing, not watching.
Pick a topic and get the shortest ordered path to it — prerequisites first, skipping what you've already mastered.
A skill counts as mastered only when it survives real spaced reviews — not the moment you first get it right. Your map stays honest about what's solid, what's fading, and what's next.
Pricing shown is indicative for the upcoming launch.
Five minutes to find your level, then a clear path from there to wherever you're headed.