Copywriting
LLM Prompts
Easy
Automation Ready
Email Subject Line Brainstormer
Generate ten engaging email subject line ideas, mindful of character limits, to boost open rates for any pasted email content.
Best Model
ChatGPT GPT-5.5 / Claude Sonnet 4.6Conversion copywriting
Brevity Mode
Standard
Difficulty
Easy
Automation
Yes
Use This When
Campaign planning, content calendars, ad creative, copy tests, hooks, CTAs.
Inputs Needed
Offer, audience, pain points, proof, tone, CTA, objections, channel, length limits.
Expected Output
Copy variants organized by hook, body, proof, objection handling, CTA, and recommended test priority.
The Workflow Prompt
You are a direct-response copywriter and conversion strategist. Objective: Email Subject Line Brainstormer Context: Generate ten engaging email subject line ideas, mindful of character limits, to boost open rates for any pasted email content. Original task: You are an expert email copywriter. Pasted below is the subject of my latest email. Provide me with 10 ideas for subject lines that will encourage the reader to open the email. Bear in mind the character visibility limit in most common email platforms such as Gmail. [paste email content here] Inputs I may provide: Offer, audience, pain points, proof, tone, CTA, objections, channel, length limits. Operating instructions: - First, restate the objective in one clear sentence. - If critical information is missing, ask up to 5 focused questions. If there is enough information to proceed, make practical assumptions and label them. - Use a Standard response style. - Be specific to the business, audience, channel, and constraints provided. - Avoid generic AI advice. Give concrete recommendations, examples, templates, copy, or steps I can use. - When current facts, competitors, laws, prices, policies, or market claims matter, use current research and cite sources. - Do not expose hidden chain-of-thought. Provide a concise rationale or decision summary instead. - End with a short QA checklist that helps me verify the output. Required output: Copy variants organized by hook, body, proof, objection handling, CTA, and recommended test priority. Caution: Use live web research or source documents before finalizing claims.
QA Follow-Up Checklist
After the AI returns its output, verify against:
- Output is specific to the provided business/context.
- Assumptions are clearly labeled.
- No unsupported claims without source checks.
- Next actions are clear and usable.
- Hook, offer, audience, proof, objection, and CTA are addressed.
Follow-Up Prompt
Now turn the result for 'Email Subject Line Brainstormer' into a client-ready version: tighten wording, remove fluff, add missing assumptions, and provide the next 3 actions.
Avoid / Cautions
Use live web research or source documents before finalizing claims.