Optimize · Subject-Line & A/B Variants
Generate Reply-Bait Short Subject Lines
Get 10 ultra-short subject lines (≤3 words) engineered to bait a reply from busy operators.
When to use
Use this when you're emailing busy founders, CMOs, or e-com operators who triage inbox by glance. Ultra-short subjects (1-3 words) often beat longer specific subjects on reply rate because they look internal, not marketed. This prompt produces 10 variants that bait a reply without being clickbait or vague.
The prompt
You are a cold-email specialist for a digital marketing agency. You know that for time-poor operators, fewer words = more replies, as long as the body delivers immediately. Agency: [AGENCY_NAME] — [SERVICES] | Email body: [EMAIL_BODY] | Prospect: [PROSPECT_NAME] at [PROSPECT_COMPANY] | Prospect role: [PROSPECT_ROLE] | The single most useful thing this email offers: [CORE_OFFER] Write 10 reply-bait subject lines, each 3 words or fewer, that look like internal/peer notes rather than outbound. - Max 3 words each — count each word - Lowercase only - No emoji, no punctuation except '?' (allowed on 2 max) - Must connect honestly to [CORE_OFFER] in the body - Avoid: hi, hello, intro, partnership, opportunity, services - Each variant uses a distinct angle: name-drop, question, observation, number, one-word, internal-sounding, deliverable, fragment, status, request Numbered 1-10: subject — angle — rationale (1 line, why a busy operator would tap it). Mark (WINNER) on the safest reply-getter, mark (WILDCARD) on the riskiest high-upside one.
Variables
[AGENCY_NAME]Your agency[SERVICES]Services[EMAIL_BODY]Email body the subject must match[PROSPECT_NAME]First name[PROSPECT_COMPANY]Company[PROSPECT_ROLE]Their job title[CORE_OFFER]The one concrete thing the email offers them
Example input
Agency: PixelBarn — Webflow dev | Email body: 90 sec Loom showing their hero section CLS issue and a fix | Prospect: Maya, CMO at Klario | Core offer: free Loom of one fix to their homepage
Example output
1. klario homepage (WINNER) — name-drop — looks internal; tap-to-skim safe. 2. hero fix — deliverable — promises a thing, not a meeting. 3. cls issue — observation — technical, peer-tone. 4. 90 sec loom — number — sets time cost up front. 5. one fix — fragment — curiosity at zero risk. 6. webflow? — question — peer tone, opens reply loop. 7. maya — one-word — wildly personal. (WILDCARD) 8. quick loom — status — feels like a teammate. 9. homepage cls — observation — paired keyword peer-speak. 10. fixing your hero — request-style — implies action started.
Pro tips
- Ultra-short only works if the body's first line earns the open in 8 words — rewrite the opener if needed.
- Never send ultra-short from a brand-new mailbox; deliverability tools flag the pattern.
- Run ultra-short against your current control as a permanent A/B — it'll either win or expose your control is weak.
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