How it works

Every replay is a real period of market history, cut into decision points. At each one you are standing on a specific day, with the chart drawn up to that day and no further.

1. Pick a company you know

Nvidia, Tesco, Bitcoin, gold, the pound. Sixty-six of them, each with a plain-English primer explaining what the business actually does and the three things that move its price.

2. Make the decision

Buy, sell or hold. You are asked why, and given the option to set a target or a stop. Holding counts — it is recorded exactly like the other two, because half of what this measures is what you chose not to do.

3. Time moves

Days or weeks pass. The next real headline arrives. Nothing you see is hindsight: both dates are ones you have already stood on.

4. Find out

At the end you get three figures — your result, what buying and holding would have done, and what panicking would have done. Then a coach reads your actual decisions and tells you what they show.

What it will not do

• It will not tell you what to buy. It is not advice and never will be.
• It will not show live prices. Prices appear at a decision point, where they are a decision rather than a browse.
• It will not let you use leverage or options — but it explains what they are, and why it does not simulate them.