Numvolt: Mental Math Trainer

Challenges and a leaderboard

Free · In‑App Purchases · Designed for iPad. Not verified for macOS.

Five minutes a day of mental arithmetic: short sessions, every mistake explained, and a leaderboard that starts with the player's own city. Numvolt is the joy of getting better at mental math. Open, calculate, understand, repeat. No account, no ads, optional one-time purchase. TEN TOPICS, A HUNDRED RUNGS EACH Addition, subtraction, multiplication, division, fractions, percentages, order of operations, powers, algebra and square roots. Each topic has its own 100-rung journey; the difficulty adjusts during the session, block by block. You pick your starting point at setup, and you can always replay a lower level. EVERY MISTAKE EXPLAINED A wrong answer takes nothing away. The correction shows the method — "take away 20, then add 1" — not just the result. In Zen mode there is no timer: time to understand. SPRINTS AND A DAILY CHALLENGE 15, 30 or 60 seconds on the + − × ÷ mix. +1 per correct answer, −1 per mistake. The daily challenge is the same 60-second series for everyone, all day long. A LADDER FROM YOUR CITY TO THE WORLD Join the ladder with a nickname and your city. Your best sprint is ranked on six rungs: city, county, region, country, continent, world. After every sprint you see exactly what you climbed — "5th → 2nd · Rhône" — and how many points you need to overtake the next player. Only your nickname, city and scores are published. Never your exact location. DUEL ON ONE PHONE Two players, the same questions in the same order, 30 seconds each. Scores are revealed at the end. YOUR PROGRESS, VISIBLE XP, overall level, accuracy, day streak, seven-day chart, level per topic and session history. A Home Screen widget shows your daily goal and starts a sprint in one tap. WHAT STAYS WITH YOU Your progress lives on your iPhone, in the app's storage. No account. Anonymous usage counters, which you can switch off in Settings, only tell us where the app gets stuck. Fractions and decimals accepted on the keypad. Light, dark or automatic appearance. Available in 46 languages. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

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• Clearer proportion drills: a direct a → b | c → ? layout, never with two equal values. • Stronger haptics, combo badges and a live personal-best tracker during sprints. • Share your score in one tap. • Now on iPad. • Prices load more reliably, and the suggestion box opens an e-mail.

Version 0.2.5

In-App Purchases

The developer, ROMEO ILARIO FLAVIO GAMBINO, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

  • Data Not Linked to You

    The following data may be collected but it is not linked to your identity:

    • Location
    • User Content
    • Identifiers
    • Usage Data

Privacy practices may vary, for example, based on the features you use or your age. Learn More

Accessibility

The developer has not yet indicated which accessibility features this app supports. Learn More

Information

Seller
  • ROMEO ILARIO FLAVIO GAMBINO
Size
  • 32.2 MB
Category
  • Education
Compatibility
Requires iOS 17.0 or later.
  • iPhone
    Requires iOS 17.0 or later.
  • iPad
    Requires iPadOS 17.0 or later.
  • Mac
    Requires macOS 14.0 or later and a Mac with Apple M1 chip or later.
  • Apple Vision
    Requires visionOS 1.0 or later.
Languages
English and 43 more
  • English, Arabic, Bengali, Catalan, Croatian, Czech, Danish, Dutch, Filipino, Finnish, French, German, Greek, Hebrew, Hindi, Hungarian, Indonesian, Italian, Japanese, Kannada, Korean, Malay, Marathi, Norwegian Bokmål, Persian, Polish, Portuguese, Punjabi, Romanian, Russian, Simplified Chinese, Slovak, Slovenian, Spanish, Swahili, Swedish, Tamil, Telugu, Thai, Traditional Chinese, Turkish, Ukrainian, Urdu, Vietnamese
Age Rating
4+
In-App Purchases
Yes
  • Numvolt Pro Yearly $14.99
  • Numvolt Pro $8.99
  • Learn More
Copyright
  • © 2026 Roméo Gambino
  • Developer Website
  • Privacy Policy

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