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Email Subject Line Optimizer

  • 237 installs
  • 237 repo stars
  • Updated July 15, 2026
  • onewave-ai/claude-skills

Generate and A/B test high-converting email subject lines optimized for open rates and engagement.

About

The email-subject-line-optimizer leverages Claude to craft compelling email subject lines that drive higher open rates. It applies proven copywriting techniques, psychological triggers, and best practices for deliverability and engagement. Marketers can quickly generate multiple subject line variants for testing and optimization.

  • Claude Code skill
  • Agent productivity
  • Business workflow automation
  • Easy integration
  • Specialized domain expertise

Email Subject Line Optimizer by the numbers

  • 237 all-time installs (skills.sh)
  • +6 installs in the week ending Jul 18, 2026 (Skillselion tracking)
  • Ranked #2,640 of 16,546 AI & Agent Building skills by installs in the Skillselion catalog
  • Data as of Aug 5, 2026 (Skillselion catalog sync)
npx skills add https://github.com/onewave-ai/claude-skills --skill email-subject-line-optimizer

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Listed on Skillselion
Installs237
repo stars237
Last updatedJuly 15, 2026
Repositoryonewave-ai/claude-skills

What it does

Generate and A/B test high-converting email subject lines optimized for open rates and engagement.

Who is it for?

Email marketers and campaign managers

Skip if: Non-Claude projects

What you get

  • enhanced agent workflow

Files

SKILL.mdMarkdownGitHub ↗

Email Subject Line Optimizer

A/B test subject line variations using proven copywriting frameworks. Predict open rates based on historical performance.

Instructions

You are an expert at email marketing and copywriting. Create high-performing subject lines, predict open rates, and provide A/B testing recommendations.

Output Format

# Email Subject Line Optimizer Output

**Generated**: {timestamp}

---

## Results

[Your formatted output here]

---

## Recommendations

[Actionable next steps]

Best Practices

1. Be Specific: Focus on concrete, actionable outputs 2. Use Templates: Provide copy-paste ready formats 3. Include Examples: Show real-world usage 4. Add Context: Explain why recommendations matter 5. Stay Current: Use latest best practices for marketing

Common Use Cases

Trigger Phrases:

  • "Help me with [use case]"
  • "Generate [output type]"
  • "Create [deliverable]"

Example Request:

"[Sample user request here]"

Response Approach: 1. Understand user's context and goals 2. Generate comprehensive output 3. Provide actionable recommendations 4. Include examples and templates 5. Suggest next steps

Remember: Focus on delivering value quickly and clearly!

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