WoW Classic SImulator? - Where is It?

So where is the WoW Classic simulator? I was told this site had one.
Where do I set my rotation? Where can I see my numbers?

I am more then willing to pay for one, if needed.

We have a WoW Classic optimizer, but not a simulator:

We use a mathematical model for ranking gear, and there are quite a few options that you can change to rank your gear as you see fit: fight length, consumables, buffs, etc. We also have a lot of customization options as well, like setting minimum resistance or hit thresholds, and customizing your spell breakdown with healers.