Does it simulate the real market because if it doesn't then it is a useless app because there are other services that offer paper trading and they are far more established which means that they are more reputable and safe. I think that this thread do belong in the Services Discussion though, you can move it by looking for the Move Topic at the bottom left of this thread and click it then choose the right discussion that it belongs.
Yep, it is a real-time market replay tool.