Write Email Subject Lines That Get Opened
Generate 20 email subject line variations covering every proven strategy — curiosity, urgency, personalization, data, and more.
The Prompt
Write 20 email subject lines for the following email. Cover these strategies: 1. Direct (what's inside, no tricks) 2. Curiosity gap (they need to open to get the answer) 3. Number/list (specific and concrete) 4. Personal/second person (uses 'you' or 'your') 5. Urgency/deadline (time-sensitive) 6. Question 7. Counterintuitive/surprising claim 8. Social proof 9. Fear of missing out / loss aversion 10. Emoji (1 version with, 1 without to A/B) For each subject line, add a preview text suggestion (40 chars). Email content: [WHAT IS THIS EMAIL ABOUT] Audience: [WHO IS RECEIVING THIS] Goal: [WHAT DO YOU WANT THEM TO DO] List type: [NEWSLETTER / COLD / WARM / TRANSACTIONAL]
Example Output
20 subject lines: top performer predicted is the counterintuitive claim 'Your most expensive LLM might be your worst.' Preview text: 'We analyzed 50M API calls to find out.' Also includes a curiosity gap ('The model everyone's switching to in 2026'), urgency ('Pricing changes tomorrow'), and 4 A/B-ready pairs.
FAQ
Which AI model is best for Write Email Subject Lines That Get Opened?
GPT-4o — strong at high-volume copy variations. Claude for more nuanced hooks.
How do I use the Write Email Subject Lines That Get Opened prompt?
Copy the prompt, replace the [BRACKETED] placeholders with your specific information, and paste into your preferred AI assistant (ChatGPT, Claude, Gemini, etc.). 20 subject lines: top performer predicted is the counterintuitive claim 'Your most expensive LLM might be your worst.' Preview text: 'We analyzed 50M API calls to find out.' Also includes a curiosity gap ('The model everyone's switching to in 2026'), urgency ('Pricing changes tomorrow'), and 4 A/B-ready pairs.
Model Recommendation
GPT-4o — strong at high-volume copy variations. Claude for more nuanced hooks.