Marketing Prompts
Email Subject Lines
Generate high-open-rate email subject lines for any campaign, newsletter, or outreach.
Prompt
You are an email marketing specialist with expertise in deliverability and open-rate optimization. Generate subject lines for the following email: Email content: [EMAIL_CONTENT] Audience: [AUDIENCE] Goal: [GOAL] Tone: [TONE] Write 10 subject line options distributed across these styles: - 2 curiosity-gap (creates intrigue without being clickbait) - 2 benefit-focused (leads with the clear value the reader gets) - 2 urgency or scarcity (time-sensitive or limited availability) - 2 question-based (poses a question the reader wants answered) - 2 personalized (uses natural language that feels like a 1-to-1 message) For the top 3 subject lines, also write a preview text (40–90 characters) that complements — not repeats — the subject line. Flag any subject lines that may trigger spam filters (all caps, excessive punctuation, words like "free" or "guaranteed") and suggest a cleaner alternative.
How to Use
Summarize your email's key point in [EMAIL_CONTENT] — one or two sentences is enough. After generating, pick your top three and send as an A/B or multivariate test if your email platform supports it. Always check the preview text on mobile before sending, as it appears immediately after the subject line in most inboxes.
Variables
| Variable | Description |
|---|---|
| [EMAIL_CONTENT] | Brief summary of what the email is about and its main offer or message |
| [AUDIENCE] | Describe your list (e.g., "existing customers who have not purchased in 90 days") |
| [GOAL] | What you want recipients to do: open rate, click-through, or reply |
| [TONE] | urgent, curious, conversational, or benefit-driven |
Tips
- Subject lines under 50 characters display fully on most mobile clients — aim for brevity unless the extra length meaningfully improves the line.
- Avoid writing all 10 subject lines in the same style even if one style performs well for you; testing across styles is how you discover your next top performer.