RetestLab.

Blind replay: no more rigged backtests.

Replay real futures sessions with the date hidden. You can't skip the bad days, and you can't remember how they ended. Your results come out in R, not in dollars that only went up because the index did.

Before you pay for a challenge, know how many you'll need.

With a trailing drawdown, a trader with zero edge passes a $50k challenge about 22% of the time. Test your strategy on real futures data under the challenge's own rules before you pay for the next one.

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What you'll get: the free guide you pick below, then launch emails only: an invite to test the beta, and the founders' pre-sale offer (a locked-in early price) for RetestLab and for the course on building an automated trading system. Nothing else, unless you tick the weekly email box. Unsubscribe in one click, any time.

Free guide (pick one or both) Is your backtest lying? A 10-point checklist The safety nets a trading bot needs before real money

Also send me the weekly email: the week's tests and one number you won't find on social media. (Optional.) I'm 18 or older. (Required: RetestLab is for adults only.)

We'll email you a link to confirm. Until you click it, you're not on the list. How we handle your email: privacy notice.

Blind replay of NQ and ES sessions, one minute at a time, date hidden until you're done.
Results in R, with real costs, and every replayed day counted, including the ones you'd rather forget.
Prop challenge rules built in: target, trailing drawdown, daily limits.
From a manual idea to an automated backtest in Python, when you're ready.

Educational tools and content. Not financial advice. Past results, real or simulated, don't predict future ones.