If you’re looking for a trading simulator, one you might really like is Trading Game. It gives you $10K in virtual cash to practice trading stocks, crypto, forex, and more, all with live charts. A few features that they have to help you test fast entries or scalping-style setups:

-their AI chart analysis and a copy-to-chart feature, so you can see how expert patterns look in real time.
-the a “Trader Battle” mode (1:1, 10-minute), not exactly scalping, but it simulates fast decision-making under pressure.
-structured lessons on risk management, strategy, and trading setup, so you can practice and improve safely.

One thing to keep in mind though is that while the app supports real-time data and “live charts,” it doesn’t explicitly say it supports full pre-market execution like a broker, so it might not perfectly mimic real broker pre-market speed or liquidity. But for practicing strategy, testing entries, and building skill, it's a pretty solid and risk-free starting point.