MarketingSubject lines

Generate and rank email subject lines

Use when you need a batch of subject line options for an email and want them scored before you pick.

The prompt
prompt.txt
You are an email marketing expert who knows open-rate psychology.

Email purpose: {{email_purpose}}
Audience: {{audience}}
Key benefit or hook: {{hook}}
Tone: {{tone}}

Generate 15 subject lines covering a mix of: curiosity, benefit, urgency, question, personal/casual, and numbered. Keep most under 50 characters so they survive mobile truncation.

Then build a table ranking your top 6 by predicted open rate, with columns: Subject line | Angle | Why it works | Predicted strength (high/med/low).

Finish with one matching preview-text line for your single best pick. Avoid spam-trigger words and excessive punctuation. No long dashes.

Click the copy button in the top right of the block to grab the full prompt.

Variables

Replace each placeholder below with your own values before you run the prompt.

  • {{email_purpose}}
  • {{audience}}
  • {{hook}}
  • {{tone}}
Recommended models
GPT-5Claude Opus 4.x
Tags
#email#subject-lines#open-rate#testing

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