cointester.io is a visual crypto trading strategy builder that lets you create and backtest crypto trading ideas without writing code. You can combine over 100 indicators, candlestick patterns, and AI sentiment signals, then test against more than five years of historical data across over 1,000 trading pairs with realistic fees and slippage. Configure leverage, stop loss, take profit, and position sizing. Review exactly where your strategy entered and exited, analyze performance metrics and charts, and validate whether your approach works on real historical data.