Trading Signal Simulator is a free Android paper-trading app by Section Nine. It gives you a $10,000 virtual portfolio so you can enter forex, gold or crypto signals from any source and see modelled results after spread, slippage and commission. Size trades by risk percentage, track win rate, profit factor, drawdown and average R, and compare signal sources. Free with ads, no in-app purchases, no account needed. Simulator only: it places no real trades and holds no money. Results are hypothetical, and trading carries a high risk of loss. Not financial advice.