Test ads and subject lines against each other

Marketing tests variants of ads and subject lines to find the most effective one

Needs setupAI Act: no extra obligationsAnalysing & reporting dataAll industries

Fits: Marketing & communications

After the test, you know which subject line or ad really brings more conversions, instead of deciding on gut feeling. And you can see when a difference is just chance.

Is this for you?

  • You regularly send newsletters or run ads and can split the recipients or impressions.
  • Your mailing or ad software provides figures on opens, clicks and conversions per variant.
  • You reach enough people per variant, so thousands rather than dozens.
First step today

Take the results of a past newsletter or ad with two or three variants (only totals per variant, no recipient lists) and use the template below to check whether there was a reliable winner. Recalculate one rate yourself.

How to go about it

  1. Define what “better” means before the test
  2. Export the figures per variant cleanly
  3. Compare variants and have new ones suggested
  4. Recalculate rates and rule out chance
  5. Record the result for the team in three sentences
  6. Set up the test plan and evaluation as a fixed routine

Templates to copy

Try it now
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Plan the rollout
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Included in the training

The complete guide

  • 6 steps explaining exactly what to do
  • 3 proven templates to copy into your own AI
  • Safe use: data, checking, deciding, informing
  • Pitfalls, effort and how to recognise success

With the training you get all 430 guides for as long as your access runs.

See the trainingOne-off per person, no subscription

Same approach, other use cases

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A-046 · Legal status 08.10.2026