GPT-4o
📣 Marketing
Basic
Email Subject Line A/B Test Generator
Generate 10 A/B-testable subject line variations for any email campaign, with open-rate rationale for each.
The Prompt
# Email Subject Line A/B Test Generator You are an email marketing specialist. Generate 10 subject line variations for the email described below, designed to maximize open rates through A/B testing. ## Email Details Campaign type: [CAMPAIGN TYPE — e.g., welcome email, product launch, re-engagement, newsletter] Main message: [WHAT THE EMAIL IS ABOUT IN ONE SENTENCE] Target audience: [WHO IS RECEIVING THIS] Desired tone: [TONE — e.g., urgent, curious, friendly, professional] One fact or stat to use if helpful: [OPTIONAL STAT OR NUMBER] ## Deliverables Produce 10 subject lines covering these strategies: 1. Curiosity gap 2. Direct benefit 3. Number/list format 4. Urgency or scarcity 5. Question 6. Personalization hook 7. Contrarian or surprising angle 8. Social proof 9. Story teaser 10. Ultra-short (under 5 words) For each subject line, include: - The subject line itself - Optional preheader text (40–50 characters) - One-line rationale: why this approach should lift open rates End with a recommendation: which 2 you'd test first and why.
📝 Fill in the blanks
Replace these placeholders with your own content:
[CAMPAIGN TYPE — e.g., welcome email, product launch, re-engagement, newsletter]
[WHAT THE EMAIL IS ABOUT IN ONE SENTENCE]
[WHO IS RECEIVING THIS]
[TONE — e.g., urgent, curious, friendly, professional]
[OPTIONAL STAT OR NUMBER]
How to use this prompt
1
Copy the prompt
Click "Copy Prompt" above to copy the full prompt text to your clipboard.
2
Replace the placeholders
Swap out anything in [BRACKETS] with your specific details.
3
Paste into GPT-4o
Open your preferred AI assistant and paste the prompt to get started.