← Lab

LAB / 04 · Live tool

Experiment Preflight

Check whether an A/B test has enough traffic and time to detect an effect that would actually be worth shipping.

Open tool
Experiment Preflight calculator
04 / EXPERIMENTS

01 / CONTEXT

The problem

Many experiments begin with a variant but no honest answer to whether the available traffic can resolve the decision. Preflight makes that constraint visible before implementation work begins.

02 / CAPABILITIES

What it does

  1. 01

    Estimate required sample size and runtime.

  2. 02

    Connect minimum detectable effect to business relevance.

  3. 03

    Expose assumptions before a test is added to the roadmap.

03 / SYSTEM

Privacy & architecture

A small static decision-support tool that runs calculations in the browser.

Built with

  • Static web app
  • Experiment statistics
  • Vercel

04 / HONEST NOTES

Known limits

  • Estimates do not replace a complete experimental design review.
  • Traffic seasonality, novelty and interference still require judgment.