This app was mentioned in 2 comments, with an average of 1.50 upvotes
https://play.google.com/store/apps/details?id=se.oort.diplicity
Diplicity. Its a remade version of the old app Droidippy that i used for years. I discovered the biard game in high school, took a few years off, then found that.
https://play.google.com/store/apps/details?id=se.oort.diplicity
That's the play store link, I don't know if it's on iOS yet.