Just use this instead of real dice!
You can throw as many as 12 dice. The sum is on the screen. There's a hold mode, to hold the dice between the throws (up to six throws). Also, the screen can be always-on. You can enable Shake-to-throw, pick a background color, turn the sound on and off, and choose your dice color.
If you're annoyed by ads, please consider buying an ad-free version. It costs about as much as a cup of coffee. Have fun!