Lab · Fictional paper replay
Change one thing.
See what the rule does.
Run the lesson’s rule through a short made-up market. Compare the ending money, then inspect each decision.
No account needed · $100 of imaginary starting capital · No real orders
A question is a good place to start.
The replay will show the cash comparison, holding comparison, and every buy, sale, wait or missing observation.
Replay result
Current runWhere did the $100 end up?
See the costs and risk along the way
Fictional prices. A 0.05% worse-price allowance applies on each side. No delay, liquidity or failed-order model. This result cannot establish a trading advantage.
Follow the decisions
What happened at each checkpoint?
Replay assumptions
Keep this experiment (optional).
Saved runs stay in this browser. Keep a download to take one elsewhere.
Your saved experiments
Up to 10 runs on this device
Your optional notebook starts with a saved run.
Manage saved experiments
These snapshots and your optional questions are kept only in this browser. Clearing them leaves your current replay open.