KendamApp is a tool for kendama players made by Platty Soft in cooperation with the British Kendama Association (BKA)

From Wikipedia page of Kendama:

A kendama (けん玉, also written as 剣玉 and 拳玉) is a traditional Japanese toy which consists of two wooden cups of different sizes placed on the center of a wooden spike and smaller cup with a ball connected by a string

The ultimate app for kendama lovers.

• A trick reference library of 100 tricks, with names in English and Japanese. From the basic Big Cup, to Aeroplane, Orbit, all the way up to “Reverse”, “Hanging”, and “Fast Hand” tricks, and much more. Keep a count of how many times you have done each one.
• Official skill level charts, so you can keep track of your progress. Self-certify yourself through the Kyu, Pre-Dan and Dan rankings.
• Trick ladders. Preset and user-defined ladders. Challenge yourself to an easy, medium or hard series of tricks. Keep a record of your success.
• Moshi Kame Metronome. Train your moshi kame to a beat. Increase your speed as you get better. Auto-detect mode will calculate how fast you are going!

Produced by the British Kendama Association.