Text & chat prompt
A/B test ideas for email subject lines
A/B test ideas for email subject lines: a free, copy-paste prompt for ChatGPT, Gemini and Claude. Paste the prompt and replace each [BRACKETED] field with your own details.
The prompt
Create five pairs of email subject lines to A/B test for [EMAIL PURPOSE] to [AUDIENCE]. For each pair say what is being tested (for example curiosity vs benefit, or short vs long), give the two versions with preview text, and state which result would make you choose which. Suggest how many recipients I need.
Pro tip: Change only one thing per test, such as length, question or personalisation.
How to use this prompt
- Open ChatGPT and start a new chat.
- Paste the prompt.
- Replace each [BRACKETED] field with your real details and paste in your own text where asked.
- Reply with follow-ups such as "make it shorter" or "make it sound more like me".
Prompt at a glance
- Category
- Text & chat
- Works with
- ChatGPT · Gemini · Claude
- Length
- 54 words
- Fields to fill in
- EMAIL PURPOSE, AUDIENCE
- Last updated
Frequently asked questions
Which AI tools work with this prompt?
It is written for ChatGPT, Gemini and Claude. Paste it into your preferred tool and adjust the wording if the result is off.
What do I need to fill in?
Replace these fields before you send it: EMAIL PURPOSE, AUDIENCE. Each field shows an example in the prompt.
Should I paste private information into the prompt?
Only what the task needs. Remove names, contact details and other sensitive data before pasting a resume or document into any AI tool.
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