Tally vs (Open Source) Mental Math

Tally makes you faster at mental math — genuinely, measurably faster — with a few focused minutes a day. No childish games, no ads, no accounts. Just a beautifully quiet training room, an adaptive engine, and numbers that start obeying you. TRAINING THAT FITS YOU Every mode tracks its own skill rating. Answer quickly and correctly and the problems grow harder; struggle and they ease off. Tally aims to keep you around 80–85% accuracy — the zone where practice feels challenging, never punishing. A five-problem calibration on first launch means even your first session fits. EIGHT MODES • Add & Subtract — from single digits to four-digit carrying • Multiply — tables through two-by-two digit products • Divide — exact division, then remainders (real mod arithmetic) • Percentages — always exact, never rounded lies • Fractions — add, compare, simplify • Squares & Roots — squares to 25², perfect roots • Powers of 10 — the decimal-shifting reflex • Mixed Gauntlet — everything, blended FIVE WAYS TO TRAIN • Practice — ten adaptive problems, untimed • Sprint — 60, 120, or 180 seconds against the clock • Zen — endless, no score, ambient calm • Gauntlet — twenty problems, three lives, rising difficulty • Daily Challenge — ten problems, date-seeded, the same ten for every Tally user on Earth. Compare your standing when you finish. PROGRESS YOU CAN SEE XP, levels, and ranks from Novice to Grandmaster. A skill graph per mode. Speed trends, your weakest operations detected automatically, and a training heatmap. After every session, a magazine-style review shows each problem, your time, and the mental-math trick you could have used. A STREAK WORTH KEEPING The ember on your home screen grows with your streak — 7, 30, 100, 365 days. Miss a day as a Pro member and a Streak Freeze covers it automatically, two per month. Reminders are gentle, optional, and honest. DESIGNED LIKE IT MATTERS Typography-first interface. A flagship dark mode. Custom haptics on every key. Subtle Metal-rendered moments when you get it right. Full Reduce Motion support. No third-party code, no analytics SDKs — your data never leaves your device. FREE VS PRO Free forever: Add & Subtract, Multiply, and Percentages practice, Zen mode, the Daily Challenge, one Sprint a day, streaks and levels. Tally Pro unlocks all eight modes, unlimited Sprints, the Gauntlet, full statistics, manual difficulty and exam presets (GMAT, GRE, aptitude), and automatic Streak Freezes. Monthly, annual (7-day free trial), or a one-time lifetime purchase. Subscriptions Details -------------------- Subscription | Validity Period | Price ----------------------------------- Pro Lifetime | Lifetime | $39.99 Pro Monthly | 1 Month | $3.99 Pro Annual | 1 Year | $24.99 Two minutes a day compounds. Start today. Privacy Policy: https://www.mindzbase.com/privacy-policy Terms of Use: https://www.mindzbase.com/terms-of-use

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