Mindmath vs (Open Source) Mental Math

Sharpen your mental math in five minutes a day. Mindmath is a fast, structured trainer for everyday arithmetic. Each session has five focused one-minute rounds: addition, subtraction, multiplication, percentages, and a final mixed challenge; so you train every skill, every day. The difficulty adapts to you: answer correctly and it pushes you harder; slip and it eases back, keeping every round at the edge of your ability. After each session you get a score based on accuracy and difficulty, and your history is saved on your device so you can watch yourself improve over time. No accounts. No ads. Fully offline. Just focused practice built for speed. FEATURES - Five timed one-minute rounds: add, subtract, multiply, percentages, mixed - Adaptive difficulty that tracks your performance - A score that rewards both accuracy and difficulty - Local progress history: track your trend or clear it anytime - Fast, distraction-free interface built for rhythm - Fully offline - No ads Whether it's for work, school, or staying sharp, MindMath gives you a structured way to practice mental math every day.

A free, open-source mental math trainer. No ads, no paywalls, no locked content — every exercise and difficulty is included. Sharpen your arithmetic with quick timed tests, custom drills, and a library of mental-math tricks. Everything runs offline and your progress stays on your device. FEATURES Timed Tests A daily 60-second challenge plus sprints, a two-minute marathon, per-operation tests, and a hard mixed test — at four difficulty levels, each with best scores. Custom Trainer Pick a number domain (Times tables, Natural, Decimal, Money, Huge), choose one or more exercises, and set per-exercise difficulty from Easy to Super hard. All the Operations Addition, subtraction, multiplication, division, squares, square roots, fractions, percentages, and modulo. Mental Math Tricks Dozens of step-by-step tricks for faster addition, subtraction, multiplication, division, and squares — with worked examples and favorites. Practice Any Trick Every trick comes with a 60-second drill built for it: × 11 drills, squares ending in 5, numbers near 100, and more. Magic Square A number puzzle: make every row, column, and diagonal add up to the same total. Four levels, from 1-9 up to bigger number sets. Progress Tracking Solved totals, accuracy, best run, daily streak, longest streak, and a weekly activity view. Fast Sessions An on-screen keypad with instant answer checking and haptics. No ads. No paywalls. No account required. 100% Open Source The complete source code is public - see it, audit it, or contribute at https://github.com/Open-Apps-Studio/mental-math