"Tap to Speak" to just tell the app what dice, or combination of dice, you want to roll.
Use a numberpad to just tell it how many and what type, fast and easy.
Unlimited dice (there may be a limit, but I haven't seen it)!
Any dice type up to 100 (d2, d3, d6, d8, d13, d42, percentile, etc).
Many customizable features:
change color of the background
allow "shake to roll"
allow a rolling dice sound
display the total of all dice rolled
change individual dice colors
Trial version limits the number of dice you can roll at one time, but the full version has no limit!