Electronically roll 1, 2 or 3 die for d4, d6, d8, d10, d12 or d20. You can also choose to roll d100/% (percentage dice) directly rather than interpreting 2d10.
The application allows you to switch between any of the above die types and the amount of die with simple selections.
Visual representations of the die are above each value to give you a better feel of actually rolling.