I've been using TouchControl
. This is an iPad/iPhone App, no Android. Obviously, there are very few hard buttons compared to Pronto, but one can use the Volume buttons. Screen interactions are much richer and one can be more elaborate with the artwork.
You do need to a different mindset. Don't approach TouchControl as a Pronto on steroids. If you held one of my TouchControl designs next to an ancient Pronto design, you'll see lots of similarities, but they are different under the hood. Some of the cheap tricks in Pronto don't play well in TouchControl and there are some cheap tricks in TouchControl that I would not attempt in Pronto.