Realistic prices and realistic friction
A simulator is only useful if its prices behave like the real market. Look for live or near-live data, real spreads, and realistic order execution. If it lets you buy at unrealistic prices or instantly fills enormous orders, you are training the wrong reflexes.
Friction matters too: small delays, market hours, and the inability to undo a trade all teach you that real investing is not a video game.
It should reward patience, not action
Many simulators gamify trading frequency — points for trades, leaderboards for biggest gains. This trains exactly the wrong behaviour. The best simulators reward holding, dollar-cost averaging, and diversification.
If your practice account makes you feel like you should be trading every day to 'win', delete it.
It should connect to real life
A stock simulator on its own is a sandbox. A great learning platform connects the simulator to the rest of your money: your salary, your budget, your monthly investing routine. That is what Citizen Investor's Real Life Mode is for — practising not just trades, but the whole rhythm of being an investor.
It should explain why, not just show what
Look for simulators that explain concepts as you go: what diversification does, why a P/E ratio matters, what a recession looks like in a portfolio. Without context, you are just clicking buttons.