[keyboard_smash]

Somebody made this app[1][2][3] for practicing tones in Cantonese.

[1] https://www.reddit.com/r/Chinese/comments/xx5g39/cantone_an_...

[2] https://apps.apple.com/us/app/cantone/id1602297692

[3] https://play.google.com/store/apps/details?id=com.cantone.ca...