Only a japenese developer can do it so brilliantly simple and feature rich.
I am buying this app with the last 1 dollar from my 50$ prepaid card and I am extremely happy I saved that dollar because now I finally have one of the best if not outright the best application for rolling dice, ever created. There's just three feature requests I can come up with, on top of my head, after which I would gladly pay the developer a PayPal donation for creating the best of the best:
1. Implement subtract, multiply and divide on the dice calculator.
2. Option to mark the X lowest/highest dice in different color.
3. The option to give the results on the bottom of the screen as a formua instead of a sum, i.e. "3+4+5" instead of 12. Also, if the X lowest/highest dice were color marked, their respective values should be colormarked as well.
4. The option to colormark dice depending on their value, Storyteller games count all dice that come up 10 as success, all 9s as partial success etc.
This will allow D&D players to roll "4d6 exclude the 1 lowest value", and Storyteller players to roll "10d10, mark all values of 9".