Assayon — free stock backtesting that assumes you're fooling yourself

Assayon is free stock backtesting with honest statistics. Declare a strategy as a spec — no code — and get the naive result and a pre-registered statistical verdict side by side, deflated for every parameter swept, every resubmission, and an untouched out-of-sample window. Most strategies fail the assay. That is the point.

How it works

  1. Declare the strategy — indicators, entry and exit rules, symbols — as a spec, not code.
  2. We backtest it on up to ten years of real daily market data, charging each symbol a liquidity-derived round-trip cost.
  3. Two verdicts, side by side: the naive result and a pre-registered validation gate.

Frequently asked questions

Is Assayon free?

Yes. Assayon's free tier is free stock backtesting with the full validation gate — no credit card. An account is only needed to run the backtest, so your results and iteration history have somewhere to live.

What is a strategy assay?

A backtest that assumes you are fooling yourself. Assayon returns the naive result and a pre-registered statistical verdict side by side — deflated for every parameter swept and every resubmission, with an untouched out-of-sample window. Most strategies fail the assay; a pass is the hallmark.

Do I need to write code to backtest a strategy?

No. You declare the strategy as a spec — indicators, entry and exit rules, and the symbols it trades. Every parameter list sweeps a grid, and each combination counts as a trial in the statistics.

How is Assayon different from other backtesting tools?

Most tools report the naive number. Assayon charges each symbol a round-trip cost measured from its own liquidity, corrects the t-statistic for the number of trials, and demands persistence in a blind out-of-sample window — the scrutiny most backtests never face.

What market data does Assayon use?

Up to ten years of daily bars of real market data, with per-symbol round-trip costs from a Corwin-Schultz spread estimate, floored by asset class.

Assayon is a ProveHouse LLC company.