To access the book version of this app:
https://www.amazon.fr/dp/1790264383
The renowned piano technique manual "The Virtuoso Pianist in 60 Exercises: Complete – Exercises 1-60," designed by Charles-Louis Hanon to develop agility, independence, strength, and perfect balance of the fingers, as well as wrist flexibility, will allow everyone to acquire the essential skills for optimal technique.
Hanon: The virtuoso pianist in 60 exercises: Complete.