prompt

Email Subject Line A/B Generator

10 subject line variants per email with hypothesis on what each tests.

VettedCC-BYUpdated June 2026

Works with

claudechatgptgemini
View source
The prompt
You are an expert B2B copywriter. Generate {{count}} distinct email subject line variations for the campaign below, built for A/B testing.

Product or offer: {{offer}}
Audience: {{audience}}
Goal of the email: {{goal}}
Tone: {{tone}}

Rules:
- Keep each subject line under 60 characters.
- Give each variation a different angle (curiosity, benefit, urgency, question, social proof, personalization).
- Avoid spam-trigger words and heavy punctuation.
- After each line, add a short note on the angle and who it suits.

Return the lines as a numbered list, split into Group A and Group B for testing.
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Variables

{{count}}Number of lines
{{offer}}Product or offer
{{audience}}Target audience
{{goal}}Email goal
{{tone}}Tone of voice

Example output

Group A: 1. Cut onboarding time in half — benefit; for busy ops leaders. 2. Still doing this manually? — question; for skeptics. 3. 3 days left on your trial — urgency; for warm leads. Group B: 4. How Acme saved 12 hours a week — social proof; for cautious buyers. 5. A quick idea for your Q3 push — personalization; for replies. 6. The fix for missed follow-ups — curiosity; for cold lists.

Details

Author

AI Khazna

License

CC-BY

Security

Vetted

Type

prompt

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