Mathemystic is the app you should consider when learning Vedic maths.
Vedic maths is an ancient Indian system of mathematical techniques and shortcuts on learning which, one can improve his speed of calculation by leaps and bounds. One can do calculations with large numbers with great ease if he/she understands these techniques.
The app comes with interactive tutorials and a gamified practice experience. The tutorials are detailed an cover a lot of edge cases. The games contain different kinds of problems. Users are awarded with stars and badges.
Users get predefined practice sets as well as the feature to customize their own practice sets.
The app comes bundled with features akin social sharing, storing of dates the user practiced on, guided practice, multi-user support and a lot more.
Although there are other Vedic maths apps on the App store, Mathemystic brings a different level of gamification and much detailed topic coverage.