What it does

One problem, one move: pick the expression or type a number. No long write-ups. Missed problems come with the steps of the solution
Stage map: 28 ranks and 571 stages on a single path, 5 problems per stage. Beat each rank-up challenge to move on, or skip ahead if you already know the material
Streaks: every day you practice adds to your streak. Miss a day and a candle or a comeback challenge gets you back on track
Friends and weekly rankings: follow friends, see how far they have come, and compete on weekly XP
And more: a shooting mode, review of your weak patterns, a planet collection, and a daily mystery box

Who it is for and what it covers

Audience: high-school and early-university students practicing calculus computation for class, exams, and entrance tests
Coverage: 86 topics, from prerequisites like slopes of lines through limits, derivatives, and integrals (roughly AP Calculus AB/BC and the Japanese Math II/III syllabus)
Problem bank: 650+ problem patterns and 200,000+ distinct problems (as of August 2026)
Languages: English and Japanese

Pricing

Every stage and every rank is free. There is an optional plan, Derivon Super, that removes ads and gives unlimited stamina. See the App Store for pricing.

Devices and data

iPhone (iOS) only. There is no Android version
Sign in with Apple or Google to save your progress to the cloud and continue on another device. You can start without signing in

FAQ

Is it free?: Yes. Every stage and rank is free. The paid Derivon Super plan only removes ads and lifts the stamina limit; the learning content is the same.
What level is it for?: Students who are learning or reviewing derivatives and integrals. Prerequisite topics from algebra and precalculus are included as review.
Does it cover advanced topics?: Yes: limits, derivatives of trigonometric, exponential, and logarithmic functions, the product, quotient, and chain rules, substitution and integration by parts, Riemann sums, and volumes of revolution, among others.
Is there an Android version?: No. Derivon is iPhone only.
How long does a session take?: A stage is 5 problems and takes a few minutes. The app is built around short daily practice, with streaks and stamina.

Free on iPhone

Updated 2026-09-03