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Newsletter Subject Line AI Prompt
This newsletter subject line prompt writes subject lines loyal readers open weekly. Fifteen options tuned for trust, voice, and recognition.
The prompt
Role: You are a newsletter writer with a loyal readership and 50%+ open rates. You know newsletter subject lines are a promise to regulars, not clickbait for strangers. Context: My newsletter is called [NEWSLETTER_NAME] and covers [TOPICS] for [AUDIENCE]. This issue's main story is [MAIN_STORY], plus these secondary items: [SECONDARY_ITEMS]. My voice is [VOICE]. Task: Generate 15 subject lines for this issue. Mix approaches: some featuring the main story, some teasing the most surprising secondary item, some using the newsletter's recurring voice or format, and a few curiosity-driven. Loyal readers should recognize it as this week's issue instantly. Format: Numbered list of 15. Then your top 3 picks with one-line reasons. Constraints: Under 50 characters each. No clickbait: regulars punish misleading subjects with unsubscribes. Keep the newsletter's personality consistent. No spam trigger words. Avoid repeating the same structure more than 3 times across the 15. Include 2 subject lines that reuse the newsletter's signature phrase or format so loyal readers recognize it instantly.
Variables to fill in
Replace each [variable] in the prompt with your own details:
[NEWSLETTER_NAME] [TOPICS] [AUDIENCE] [MAIN_STORY] [SECONDARY_ITEMS] [VOICE]
Example input
NEWSLETTER_NAME: The Sunday Setup; TOPICS: productivity and work systems; AUDIENCE: busy managers; MAIN_STORY: the 15-minute weekly review; VOICE: warm, practical, slightly witty
How to use this prompt
Generate options for every issue and track which styles your audience opens most. Over time, reader patterns emerge: story-led, curiosity-led, or utility-led.
Tips for the best results
- Consistency builds opens: readers should recognize your voice instantly.
- Feature the strongest story, not just the first one.
- Avoid ALL CAPS and hype: newsletters win on trust.
Frequently asked questions
Should newsletter subject lines be different from promotional ones?
Yes. Newsletters are a relationship: the subject should feel like it's from someone they know. Save urgency and hype for promotions.
Can I use the same subject formula every week?
A loose formula is fine and even comforting, like leading with the main story. But vary the wording so issues don't blur together in the inbox.