Tradebreath

Tradebreath serves two kinds of users with one product. Discretionary traders get a proper manual replay: a chart that moves through history, 100+ built-in indicators plus custom ones, drawing tools and candlestick patterns, bar-by-bar fill simulation using real tick data at L1 bid and ask, multi-chart replay across symbols and timeframes, and full time control down to 1-second bars. Systematic traders get an agent: describe a market and a rule in plain language, and it writes the strategy or custom indicator, runs the backtest, and explains what it did. An AI backtest arrives as an order list you can open on the chart and continue by hand.

The data layer is deliberately broad. Over 800 symbols cover seven asset classes — forex, stocks, crypto, commodities, indices, ETFs and bonds — with roughly 20 years of history and more than 10 billion bars, refreshed daily. Tick history includes L1 bid and ask, so entries and exits fill at prices that actually existed at that moment, and spreads and commissions are applied during replay rather than estimated afterwards. You can also upload your own OHLCV or tick CSV and backtest it like any listed symbol, with files parsed in your browser so your data never leaves your machine.

Strategy management is version-tree based rather than number-based. Saving a strategy records a version and the version it came from, so you can fork any version to test a different exit without losing the one that worked, and each version keeps its own runs and results for comparison. Sessions end with a full report covering trade statistics, a performance calendar, Monte Carlo simulation, net profit, profit factor, win rate, expectancy, max drawdown and Sharpe ratio. Finished work exports as Pine Script for TradingView, MQL5 for MetaTrader 5 or Python for your own research stack. The core product is free forever with usage quotas, and paid plans unlock more capacity.