What does Rule Lab do?

It replays one list of trades against the rules of 2 to 4 prop firm plans and draws the equity curve, each plan's max loss floor and its daily loss limit, trade by trade. It marks the first breach and says in plain words which rule caused it.

Why do intraday trailing plans breach first so often?

An intraday trailing floor follows your highest equity, open profit included. A trade that runs up $1,000 and closes at $200 still lifts the floor by $1,000. EOD trailing only moves on the closing balance, and a static floor never moves.

Are the firm rules in Rule Lab exact?

No. Max loss, drawdown type, daily loss and consistency come from BestProps data pulled on 2026-10-01. Profit targets are often filled in and are labelled Illustrative. Whether a trailing floor stops at the starting balance and whether a daily loss limit ends the account are engine assumptions, labelled Assumed. Check the firm rulebook before you trade.

How is the consistency rule calculated?

As your best day's profit divided by your net profit for the period. A 40% rule passes when the best day is 40% of net profit or less. Some firms measure against the profit target instead, so check the wording.

Does Rule Lab predict whether I will pass?

No. It shows what the rules would do to the trades you enter. It does not estimate pass rates or future results.

Engine v1.0Rule Lab

Same trades. Different rules. Watch which floor breaks.

Each glass floor is one plan's max loss limit, moved by its own rule. The white line is your trades. Pick a week, or type your own trades below.

Four green days where open profit ran much higher than the close, then one bad day.

Change plans and trades

Loading plan data from BestProps program pages. Illustrative

02Workbench

Step through it, trade by trade

Inputs

Up to four plans from BestProps program pages, limited to plans whose page states the max loss and how the floor moves. Two engine switches you control, marked Assumed on each plan.

Plan 1

Plan 2

Plan 3 optional

Plan 4 optional

Evaluation Funded

Trailing floor stops at starting balance

By market means futures plans pause for the day and forex plans fail.

Fig. 02Good week, then a red dayP and L from the starting balance. Each coloured line is one plan's max loss floor.

Plan by plan

Edit the trades8 trades over 5 days, net -$400

Enter each trade's closed P and L. Best open profit and worst open loss are optional: they are the highest and lowest the trade reached while open. We assume the best came before the worst, which is the harder case for trailing floors.

Day	Closed P and L	Best open	Worst open	Remove
Trade 1 day	Trade 1 closed P and L	Trade 1 best open profit