This app was mentioned in 1 comment, with an average of 1.00 upvote
I tried this one for a few minutes, wasnt the right way to do it for me but might suit you: Dont know if its avaiable on iOS tho, I dont use any Apple products.
https://play.google.com/store/apps/details?id=de.r2projects.dart
Edit: typos and such...