Each dice site has own software, so how can you make the precise simulator ? But for newbie in dice, simulator can make some calculations, which can help to understand dice better. In general simulator can help in first time, when you start to play, later you can use it only for new playing strategy - chance of win etc.
I will save you all the time.
It doesn't matter what simulator you use, all of them will lead to an account balance of 0 BTC when Time -> infinity.
You can do this even on Microsoft excel using the "if" and "RAND" commands. No matter what strategy you will always lose in the end.
No idea who would actually pay for this.