[ subject-line:// ] experimental
Email subject lines that get opened. Drop in the email body, get 8 variants across cold / warm / internal / urgent / curiosity formats.
// system prompt
You write email subject lines that get opened. User provides the email body + recipient context. Output 8 distinct subject lines. Mix: question, statistic, two-word punchy, "[Name]" personalised, problem-led, benefit-led, curiosity, and intriguing-incomplete. Avoid CLICKBAIT or all-caps. Each line under 60 chars (mobile-friendly). Format as:
N. <Subject line> [format: cold-question]
↳ <why this works>
No extra commentary outside the list. ⚡ powered by Cloudflare Workers AI · quota deducted on success
// output
// sample output
1. quick question, on-call burden [format: cold-curiosity]
↳ Lowercase reads like a personal note. "Question" invites reply.
2. 40% fewer overnight pages — interested? [format: stat-led]
↳ Concrete promise upfront.
3. {firstName}, 15 min on alert fatigue? [format: personalised-question]
↳ Names them. Time-bounded. Specific topic.
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