Somebody did actually make an app that does exactly that for Cantonese! https://www.reddit.com/r/Chinese/comments/xx5g39/cantone_an_app_for_mandarin_and_canton

Somebody did actually make an app that does exactly that for Cantonese! https://www.reddit.com/r/Chinese/comments/xx5g39/cantone_an_app_for_mandarin_and_cantonese_tones/ https://www.reddit.com/r/Chinese/comments/xx5g39/cantone_an_... https://apps.apple.com/us/app/cantone/id1602297692 https://apps.apple.com/us/app/cantone/id1602297692 https://play.google.com/store/apps/details?id=com.cantone.cantone https://play.google.com/store/apps/details?id=com.cantone.ca...