Test a strategy claim — see what it really did, after real costs, measured against simply holding.

Paste a strategy someone is selling — a rule you were handed, a description in plain English, or a “this made X%” claim — and we reconstruct a testable version and run it on an honest engine: real costs and slippage on, next-bar fills, every trade set beside simply holding. Once the costs are real, most claims come out behind simply holding — so the rare one that doesn’t is worth finding before you risk a cent.