What is this, in plain English?
A backtest takes a trading strategy and runs it on real past market data — so you can see how it would have performed over the last few years, before you risk a single dollar.
The one question that matters: did it beat simply buying the S&P 500 and doing nothing? That's the easy alternative, and the bar any strategy must clear. This page tells you, honestly.
Set up your test
Only the two validated styles are shown — both beat the market in our testing. (Short-term styles lagged and were retired.)
Longer = more reliable. 3 years covers good and bad markets.
Type ticker symbols, separated by commas (e.g. AAPL, MSFT). More = slower. Max 30.
Advanced options (most people can ignore these)
⏱ 10 stocks over 3 years takes about 20–60 seconds (it downloads real price history).
Clone a legendary investor's 13F 📋
Every big fund must disclose its US stock holdings each quarter (a 13F filing). This shows what $10,000 cloning that fund — buying its holdings, rebalanced each quarter with the real 45-day reporting lag — would have become, versus simply buying the S&P 500.
200+ funds — the largest active managers + famous investors, ranked by their 13F clone's return. Holdings are real SEC filings.