This question shall not be confused with Demo-trading as in demo you have real-time or near to real-time data feeds connected to your trading platform and you place orders manually and it will reach the Take-Profit/Stop-Loss etc target in due time.
In the simulated trading, you have the historical tick data (or at least historical data from a reputable Forex/Futures broker), and you can place the order manually and set the Take-Profit/Stop-Loss etc then you play/playback the market.
Conceptually the Trading simulator platform is different from demo if you know what I mean?
May someone please mention a few Forex/Futures trading simulator platforms names and prices?
Tnx and best of luck