RN TradeLab is a free backtesting and research platform for NSE stocks, built so traders don't have to guess if a strategy actually works. Walk-forward testing, write your own indicators and strategies, and Pattern Probability - real historical odds for any candlestick pattern, sample size always shown, never oversold. Gold unlocks Live Chart and Pattern Probability early. Built solo, after losing money on ideas that only looked good in hindsight.