NumDrill - Math You Can't Stop
Sharpen Your Brain, Every Day
Free · Designed for iPad. Not verified for macOS.
Relying too much on calculators and AI? Get your number sense back. Drills from arithmetic to trig and logs. Compete on global leaderboards!
Can you still calculate a tip, split a bill, or work out a percentage in your head?
Every time you reach for a calculator or ask AI, your mental math skills quietly fade. The good news: they come back fast with regular practice.
NumDrill is a focused mental math drill app designed for short, satisfying sessions. Instead of mindless scrolling or another mobile game, sharpen the brain you already have.
■ Who it's for
· Anyone whose mental math has gotten rusty from over-relying on calculators or AI
· Students preparing for exams or standardized tests
· Professionals who want to stay mentally sharp
· Anyone who suspects they're wasting time on games but keeps playing anyway
■ 10 Problem Categories
- Arithmetic (addition, subtraction, multiplication, division — customize digits & decimals)
- Quadratic expressions (factoring & expansion)
- Trigonometry (sin / cos / tan values)
- Square roots
- Logarithms & Exponents
- Ratio & Percentage (everyday percentage calculations)
- Make10 / Make24 (card-based number puzzles)
- Memory (memorize and recall grids of numbers & icons)
- Mastermind (deduce a hidden number sequence with logic)
- Calculator mode (Practice mental arithmetic using calculation patterns you frequently use in everyday life)
■ 3 Play Modes
- Count / Timed / Endless
■ Features that keep you coming back
- Streaks / Combos / XP / Global Leaderboards / Social Share
■ Customizable
- Difficulty / Advance rules / Sound & Vibration
Your brain is a muscle. Five minutes a day is all it takes.
Open NumDrill.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
■ New category: Mastermind
Crack the hidden number sequence in this classic code-breaking game. Solve it in as few guesses as you can and put your logic to the test.
■ Daily Challenge
Complete daily quests to earn bonus XP, with extra rewards the longer you keep your streak going.
■ Play reminders
Get a notification at the time you choose to keep your streak alive.
■ First-launch tutorial
New players get a quick guide to the controls — replay it anytime from Settings.
■ More improvements
- Redesigned dial-lock UI for arithmetic settings
- Countdown to the next ranking aggregation
- Your answer and a report button on the answer dialog
- Improved icons and scoring for the Memory category
- Bug fixes and stability improvements
The developer, KEN ITAKURA, 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 Used to Track You
The following data may be used to track you across apps and websites owned by other companies:
- Identifiers
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Identifiers
- Usage Data
- Diagnostics
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- KEN ITAKURA
- Size
- 116.2 MB
- Category
- Education
- Compatibility
Requires iOS 18.2 or later.
- iPhone
Requires iOS 18.2 or later. - iPad
Requires iPadOS 18.2 or later. - Mac
Requires macOS 15.2 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 2.2 or later.
- iPhone
- Languages
- English and Japanese
- Age Rating
13+
- 13+
- Frequent
Contests
Contains
Advertising
- Copyright
- © 2026 Ken Itakura