10 ChatGPT Prompts for Email Subject Lines That Get 40%+ Open Rates
Copy-paste ChatGPT prompts to write email subject lines that actually get opened. Tested formulas for sales, newsletters, cold outreach, and follow-ups. Each prompt is tested, ready to copy-paste, and works with ChatGPT, Claude, Gemini, or any AI.
1 Curiosity-Driven Subject Line
Write 10 email subject lines for [YOUR PRODUCT/SERVICE] that use curiosity gaps to drive opens. Each should be under 50 characters. Target audience: [YOUR AUDIENCE]. Avoid clickbait — every subject line must be honestly fulfilled by the email body.
Pro tip: Curiosity gaps work best when they hint at a specific number or result.
2 Urgency Without Being Spammy
Write 10 email subject lines that create genuine urgency for [YOUR OFFER]. No fake scarcity. Use real deadlines, limited quantities, or time-sensitive relevance. Keep under 45 characters.
Pro tip: Real urgency outperforms fake urgency 3:1 in A/B tests.
3 Personalized Subject Lines
Write 10 email subject lines for [YOUR PRODUCT] that feel personally written to [TARGET AUDIENCE]. Use their language, reference their daily challenges, and sound like a friend texting — not a brand broadcasting.
Pro tip: Subject lines that feel personal get 26% higher open rates.
4 Question-Based Subject Lines
Write 10 email subject lines as questions that [YOUR AUDIENCE] would immediately want the answer to. Each question should relate to [YOUR PRODUCT/SERVICE] and make the reader think "that's exactly what I need to know."
Pro tip: Questions that match the reader's internal dialogue perform best.
5 Number-Driven Subject Lines
Write 10 email subject lines that lead with a specific number or statistic about [YOUR INDUSTRY/TOPIC]. Format: [Number] + [Benefit]. Example pattern: "7 ways to [achieve X] without [common pain point]."
Pro tip: Odd numbers in subject lines get 20% more clicks than even numbers.
6 Re-engagement Subject Lines
Write 10 email subject lines to re-engage subscribers who haven't opened in 30+ days. Product: [YOUR PRODUCT]. Tone: warm, not guilt-tripping. Include a mix of "we miss you" and "here's what you've missed" angles.
Pro tip: The best re-engagement subject lines acknowledge the gap without guilt.
7 Cold Outreach Subject Lines
Write 10 cold email subject lines for reaching out to [TARGET ROLE] at [COMPANY TYPE]. I'm selling [YOUR OFFER]. Subject lines must feel like a real person wrote them — no marketing speak, no ALL CAPS, no emojis.
Pro tip: Cold email subject lines under 5 words get the highest open rates.
8 Newsletter Subject Lines
Write 10 subject lines for a weekly newsletter about [YOUR TOPIC]. Each should tease the best insight from that week's issue without giving it away. Mix formats: questions, numbers, provocative statements.
Pro tip: Newsletter subject lines should build a habit — consistent format helps.
9 Follow-Up Email Subject Lines
Write 10 follow-up email subject lines for [SITUATION: e.g., after a demo, after no reply, after a purchase]. Each should add new value, not just say "following up." Reference a specific benefit or new angle.
Pro tip: Never use "Just following up" — it signals you have nothing new to say.
10 A/B Test Subject Line Pairs
Create 5 A/B test pairs of email subject lines for [YOUR CAMPAIGN]. For each pair, vary ONE element: length, personalization, emoji usage, question vs. statement, or number vs. no number. Explain what you're testing in each pair.
Pro tip: Only test one variable per A/B test for clear, actionable results.
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