Raijin Software

Kopfnuss

Paid

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...

Kopfnuss Lite

Free

Kopfnuss Lite is the free Sidekick of the Top Ten Education App Kopfnuss. Like in the full version, you can train your brain in order to deal with...