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About this tool
Drafts a newsletter prompt with segment, cadence and CTA guidance — subject-line limits and a per-item word budget built in.
The Newsletter Prompt Builder writes an AI drafting prompt for one newsletter edition, built around your audience segment, sending cadence and a single primary CTA. It allocates the word count across the opening note, each item and the sign-off, and embeds the deliverability limits that matter in practice: a roughly 40-character mobile subject line, a 40-100 character preheader, and a rule that the one CTA appears at most twice.
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The prompt names a single ask and caps it at two appearances, so drafts stop arriving with five competing links.
Daily, weekly, fortnightly and monthly presets carry word ceilings (300 / 800 / 1,200 / 1,500) and warn when your target exceeds them.
Subject-line and preheader character limits are written into the prompt, so what the model drafts survives mobile truncation.
Keep it to about 40 characters. Mobile mail clients — where most opens happen — truncate subject lines around 30 to 40 characters, with iPhone Mail in portrait being the usual worst case. This tool writes that 40-character ceiling directly into the drafting prompt.
It depends on cadence: roughly up to 300 words for a daily send, 800 for weekly, 1,200 for fortnightly and 1,500 for monthly are workable ceilings. The more often you land in the inbox, the shorter each email must be — this tool warns when your target length exceeds the ceiling for your chosen cadence.
One primary CTA per email is the safer rule — multiple competing asks split clicks and muddy what the edition is for. The generated prompt allows the single CTA to appear at most twice: once mid-email and once restated in the sign-off.
The preheader is the preview line mail clients show next to or under the subject, and 40 to 100 characters is the practical range. Shorter than about 40 characters, many clients pad the slot with whatever stray text opens your email — often an unsubscribe link or 'view in browser'.