Brain training with numbers, five minutes a day.

Numbio is a brain training app built on mental math. Short daily sessions of arithmetic drills, Sudoku, Magic Square and Number Hunt give your mind a workout you can measure, with every score charted over time. No ads, no clutter, just numbers.

$Three Numbio exercise cards: multiplying whole numbers, multiplying euro amounts, and a fraction task$

A daily habit in over 40 countries

More than 40,000 people open Numbio every month in over 40 countries, from commuters and retirees to lifelong puzzle fans, and it has earned over 5,000 five-star ratings along the way.

Smiling older woman with gray hair and glasses in a rust cardigan

Jules Arkansas

Aug 27, 2025

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United States

I was looking for a way to do mental math faster and also for a habit that would exercise my brain, “get the engines running” first thing in the morning. This is a fun, helpful and also beautiful app.

GuateMiguk
Sep 17, 2025
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Canada
“You can teach an old dude new tricks. As a senior citizen (aka old geezer), this app has inspired me to relearn algebra, geometry and trig.”
i-mane the new man from apple
Aug 13, 2024
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Morocco
“I started using the app as a substitute to social media to avoid scrolling all the time and i really like it! It’s mind refreshing”
Rain River
May 9, 2024
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United Kingdom
“Just 5 minutes a day to keep your mind sharp”
NormanRockwel
Jan 18, 2025
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Brazil
“I love to use it as a warmup for the day! My morning routine”
Imawalker220
Jun 1, 2024
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United States
“As I get older I like to keep up with mental math. This is a great review and it’s in short segments.”
Deuce McShneebs
Oct 10, 2025
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United States
“Helps improve mental math speed and wake the brain up a bit. Like hi-performance flash cards.”

4.6

8K+ Ratings

1 M+

Users Globally

Number puzzles, not just drills

Sudoku, Mini Sudoku, Magic Square and Number Hunt turn arithmetic into puzzles. Fill the grid, make every row hit the target sum, or combine numbers to reach a goal. All four games are free, with leaderboards to chase.

Numbio Magic Square puzzle with the target sum 15, one cell just filled with 1, solved in 1:42.

Numbio daily goal card with six days completed, a 12-day streak and five minutes of practice today.

Five minutes with your morning coffee

Set a daily goal, keep your streak alive, and let the Home Screen widget show a new exercise every minute. It’s shorter than the morning news and more satisfying than scrolling.

Tricks that feel like magic

Why does almost every four-digit number lead to 6174? Why do the digits of any multiple of 9 add up to a multiple of 9? The Textbook explores number curiosities like these and the tricks behind fast mental math, and it’s free to read.

Numbio Textbook card showing Kaprekar's routine from 3524: 5432 − 2345, 8730 − 0378 and 8532 − 2358, ending at 6174.

Numbio performance chart with a rising test score of 31, ranking the player in the top 12% of their age group.

See yourself get faster

Every test score is charted over time, so you can watch it climb week by week. Numbio also ranks your speed against players worldwide, and against your own age group once enough of them have played.

A full workout for your number sense

Drills, puzzles and tricks, plus the tools that make five minutes a day stick.

Four number games

Sudoku, Mini Sudoku, Magic Square, Number Hunt.

Timed tests

Free one-minute rounds to beat your best.

Listening mode

Hear the exercise, solve it in your head.

Chain calculations

Carry a result across several steps.

Mental math tricks

Shortcuts that make big numbers easy.

Number curiosities

Kaprekar’s 6174, the magic of 9 and more.

Streaks and daily goal

A small target each day, and a streak to protect.

Home Screen widgets

A new exercise every minute.

Leaderboards

Seasonal rankings for every test.

Give Your Brain Five Minutes a Day!

Tests, games and the Textbook are free with no ads. Pro unlocks every drill and listening mode.