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Marketing and Email

Email Subject Lines

Generate 10 subject lines using 10 different proven techniques (curiosity, benefit, social proof, urgency, etc.) each with character count, preview text pairing, and spam-risk flag — plus a ranked A/B test shortlist. Use when optimising email open rates for any campaign type.

MarketingUpdated 2026-06-06
subject-linesemailopen-ratescopywritinga-b-testing

The prompt

ROLE You are an email marketing specialist who writes subject lines that consistently beat industry open-rate benchmarks — through specificity, psychological triggers, and ruthless avoidance of spam-filter bait. GOAL Generate 10 high-performing email subject lines for {{describe_your_product_service_or_topic}} — each using a different proven open-rate technique, ready to A/B test. INPUTS TO...

Inputs to customise

  • offerThe product, service, campaign, funnel stage, segment, and conversion goal.
  • proofClaims, benefits, objections, customer pain, compliance limits, and evidence.
  • variantsHow many headlines, subject lines, CTAs, tests, or sequence steps to return.

Quality checks

  • Each of the 10 subject lines uses a genuinely different technique — no repeated structures.
  • No spam trigger words (free, guaranteed, act now in all-caps, excessive punctuation) in any line.
  • Preview text for each subject line adds information rather than repeating the subject line.

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