AI Blocks › Plan what ads to test
Experiment designer
Describe the change you want to test. Get a clear hypothesis, test plan, sample size and a way to read the result.
Experiment designer is a free AI skill for the job "Plan what ads to test". Give the instructions to an AI assistant that supports the required files and tools, then review its output.
Free · No account · MIT licence · Made by Corey Haines
Made by Corey Haines. See the original on GitHub; we copied it as it is, with its licence.
What it does
A test plan you can run without fooling yourself: one clear hypothesis, the right sample size, the metric to judge it and rules for reading the result. You describe the change you want to try. The skill asks about your current conversion rate, your traffic, and your tools and timeline. It then writes a specific prediction rather than a vague hope, sets a single variable to change, and picks one main metric tied to money plus a few side metrics. It fixes the sample size in advance and tells you not to stop early when results look good. You also get guidance on turning tests into a regular program.
You give it
- The change you want to test
- Current conversion rate
- Weekly traffic
- Tools and deadline (optional)
- Your results (optional)
You get
- Written hypothesis
- Test design with one variable
- Sample size and run time
- Main and side metrics
- Rules for reading the result
Use it when
- You want to test a new headline, page or price and need a proper plan.
- Past tests gave results nobody trusted.
- You do not know how much traffic a test needs.
- You want a simple routine for running experiments each month.
How to use it
- Add it to your AI once: download it and add the folder to Claude, ChatGPT or Codex as a skill.
- Ask for the job in your own words. Your AI opens the skill when it fits.