Grasshopper is free to use and the app is available for iOS and Android.
To log in with your Google account. The basic principle is that you don't make any mistakes, but just of all tries, so the program to get the hang of. There first follows an explanation about the way of communicating within code and what you should do. Further, specify how often you want to practice, where every day is a good option, but you can also choose from a few times per week.
Grasshopper has the following characteristics:
You can free download Grasshopper and safe install the latest trial or new full version for Windows 10 (x32, 64 bit, 86) from the official site.
Devices: Desktop PC, Laptop (ASUS, HP, DELL, Acer, Lenovo, MSI), Ultrabook
OS: Professional, Enterprise, Education, Home Edition, versions: 1507, 1511, 1607, 1703, 1709, 1803, 1809