Trading simulator
Family V · Platforms
Not to be confused with trading signal, trading desk, trading terminal.
Trading simulator is a software environment that replicates the essential mechanics of a live market — price feeds, order types, fills, and account balances — while using simulated money instead of real funds. It is used for training, strategy testing, and platform familiarisation, and it may be offered by a broker, a data vendor, or a standalone application. Because it does not route orders to a real venue, fills and slippage are approximations rather than actual market outcomes.
How a simulator works
A simulator maintains a virtual order book and a virtual cash balance. When a user submits an order, the software checks it against the simulated market — typically a feed of real or delayed prices — and records a fill according to its own matching rules. Those rules may be optimistic: many simulators fill market orders instantly at the last traded price, ignore partial fills, and apply no queue position or latency.
Account equity, margin, and profit-and-loss are recalculated from the simulated positions. Because no order reaches a live venue, the results are indicative only. The gap between simulated and live results is often called slippage or execution shortfall, and it varies by instrument, order size, and market conditions.
Worked example
A trader starts a simulator with a virtual balance of 10,000 USD and buys 100 shares of a stock quoted at 50.00 USD.
The 300 USD gain is recorded in the virtual account. In a live account, commissions, spread, and the actual fill price would reduce or alter that figure.
Limits and typical uses
- Training: practising order entry, position sizing, and platform navigation without financial risk.
- Strategy testing: checking whether a rule set would have produced trades under historical or forward prices, though simulator fills are not a substitute for a dedicated backtesting engine.
- Feature comparison: evaluating a platform's interface before opening a live account.
Simulated results should not be treated as evidence of future performance. The absence of real execution frictions — partial fills, requotes, latency, and liquidity gaps — means a profitable simulation can correspond to a losing live account.
Often confused with
- trading signal
- A trading signal is a notification that a specific financial instrument should be bought or sold, often including an entry price, stop-loss and take-profit, generated by human analysis or an automated system and distributed through a platform, app or messaging channel.
- trading desk
- A trading desk is an organisational unit within a financial firm where staff execute, monitor and manage orders and positions, either for the firm's own account or on behalf of clients.
- trading terminal
- A trading terminal is a software application that connects to one or more brokers or exchanges and lets a user submit, modify and monitor orders, positions and market data from a single interface.