it's Unofficial app with Standoff 2 case. It works almost like case simulator but there the huge difference.
The thing is to open cases in one time with your opponents. If you get more valuable drop then you'll get all cases of your opponents.
In game can participate from 2 to 4 players
You can open as many cases as you want
All you drop will be saved in an inventory.
The cases have the same skins as in the game with similar drop rates.

The first release available with BOTs only. The next updated will be in the way to allow you play with real players.

Good luck and GG