Key Takeaways
- Generates multiple subject lines designed to boost open rates.
- Works in ChatGPT, Claude, Gemini, and most AI assistants.
- Describe your email and audience in the brackets.
- Avoid clickbait — the subject must match the email honestly.
Your subject line decides whether an email is opened or ignored. This prompt generates a batch of subject-line options in different styles — curiosity, benefit, urgency — so you can pick the one most likely to earn the open, without resorting to clickbait.
The prompt
Act as an expert email marketer. Write subject lines for the email below. Email is about: [what the email contains] Audience: [who receives it] Goal: [e.g. get opens, drive clicks to an offer, share news] Write 10 subject line options in a mix of styles: curiosity-driven, benefit-led, direct, and playful. Keep them concise (ideally under about 50 characters), honest to the email's content, and free of spammy or misleading clickbait. Note which one or two you would recommend testing first.
How to use it
Describe what the email is about, who it is for, and your goal. You will get ten varied subject lines with a couple recommended to test. Pick two or three and A/B test them — and make sure each honestly reflects the email.
Tips for best results
- Keep it honest — a misleading subject gets opens once, then destroys trust.
- Test a few — A/B testing beats guessing which line wins.
- Mind the length — short subjects display fully on mobile.
- Ask for angles — "give me 5 more benefit-focused options".
A quick example
For a newsletter about "3 AI tools that save time", targeting busy professionals, you will get options from curiosity ("The 3 tools I stopped working without") to direct ("3 AI tools to save hours this week") — ready to test.
Frequently asked questions
Which AI tools does this work with?
Any capable chat assistant — ChatGPT, Claude, Gemini, and others. Paste it in and fill the brackets.
Do catchy subject lines really matter?
Yes — the subject line is the single biggest factor in whether an email is opened. But it must match the content honestly, or you win the open and lose the reader’s trust.
This prompt was written and tested by the World of AI Hub editorial team.