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Writing and Content

Email Marketing subject

Writes 5 subject line options for a product email — each under 50 characters, using distinct psychological triggers, with character counts and an A/B testing recommendation. Use when you need a brand-voice-consistent subject line with options to test rather than a single guess.

WritingUpdated 2026-06-06
email-marketingsubject-linescopywritinga-b-testingmarketing

The prompt

ROLE You are an email marketing specialist who writes brand-voice-consistent subject lines that earn opens — balancing brevity, clarity, and intrigue within strict character limits. GOAL Write an email subject line for {{product}} from the brand {{brand}}, using a maximum of 50 characters. Produce 5 subject line options covering different angles so the user can choose or A/B test the best fit for...

Inputs to customise

  • readerThe audience, persona, knowledge level, and objections.
  • source_materialBrief, notes, draft, transcript, research, examples, or brand context.
  • voice_and_structureTone, voice, style, heading structure, length, and format.

Quality checks

  • All 5 subject lines are under 50 characters with character counts shown and distinct psychological triggers labelled.
  • Urgency language is flagged with [ADD DEADLINE OR REMOVE URGENCY] if no real deadline was provided in the inputs.
  • The recommended A/B testing pair is identified with a rationale tied to the stated audience and brand voice.

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