iPhone Screenshots


Kopfnuss is an app that helps you train your brain in order to deal with all kinds of numbers.
Whether you're summing up your shopping bill, tipping appropriately at your local diner or deciphering roman numbers on historical buildings - soon everything appears to be as easy as 1+2=3.

★ Press and User opinions ★

"Well done! Elementary schools math in an enjoyable way."
5/5 - APPS&CO

"A well-made App for your entire family."
5/5 - Appsolutely

"Math game with a nicely done interface, that trains your mental arithmetic capabilities."
Grade: 2.1 - Macwelt

"At a mere 99 cents, Kopfnuss is a great bargain. The game is well-made, and it offers plenty of challenging gameplay that almost anyone would enjoy."
5/5 - helium.com

"I would highly recommend you buying this app."
5/5 - TheDolt's Blog

"Top! This app is just perfect!"

"What a great way to get one's couch potato brain of its couch."

"Well-thought-out, beautiful and challenging app."

"A fun, friendly app to keep your mind sharp, quick and flexible."

"Made with love."

"This incredibly well polished game has a beautiful simple interface and challenging gameplay."

★ Features ★


With Kopfnuss, you can practice basic arithmetics, the rule of three, percentage calculation, roman and square numbers and calculating basic sums of money.
Each exercise contains ten problems. Take your time solving them, there's no time limit. If you get one wrong, Kopfnuss will show you the correct answer and ask the same question later again.
Some exercises take approximations for an answer. These are identified by "≈" preceding the result. A 5% spread is perfect, a 10% spread is the permitted maximum.
You can choose the level of difficulty for all exercises. If hard is no more challenge to you, Kopfnuss will increase the level of difficulty. If your score withers, the problems get easier again.

➜ TIME TRIAL - Ready for a challenge?

Time: 90 seconds.
Math problems: one by one until you run out of time.
Rules: credits for correct and quick answers, if you answer incorrectly, points will be deducted.
Award: Highscore list entry and trophies on your own device. And you can publish your score on Facebook!


Share Kopfnuss with your family, your roommates, your best friend – the app provides user profiles for each and everyone.
Kopfnuss remembers the number of correct and false answers for everyone and their highscores and trophies respectively. To edit users or to add new people just tap the name on the start screen to enter the user management.


Kopfnuss remembers how many problems were solved right or wrong.
For every user, difficulty setting and kind of exercise. The gathered data is rendered into an attractive chart - combined or separated by exercises - that way you can review your progress from first use to the present day.

What's New

Version 1.1.0

- New exercise: Percentage calculation
- New exercise: Write roman numbers
- Approximate solutions for some exercises
- Additional time trial discipline
- New supported languages: French, Spanish

Ratings and Reviews


Un passe-temps amusant !

Joli graphisme et toujours utile pour refaire un peu de calcul mental…


Paul Christoph Grathwohl
3.5 MB
Requires iOS 3.0 or later. Compatible with iPhone, iPad and iPod touch.
English, French, German, Spanish
Age Rating
Rated 4+
© 2010 Raijin Software
1,09 €


  • Family Sharing

    Up to six family members will be able to use this app with Family Sharing enabled.

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