Numbio is described as 'Adaptive mental math app with arithmetic practice, speed drills, brain games, step-by-step tricks, personalized plans, and detailed progress tracking' and is a Math Game in the education & reference category. There are more than 25 alternatives to Numbio for a variety of platforms, including Android, iPhone, iPad, Android Tablet and Web-based apps. The best Numbio alternative is Mental Math - By Mental-Math, which is both free and Open Source. Other great apps like Numbio are Duolingo Math, Elevate, Ninimaths and Freaking Math.