Email Subject Line Optimizer
skill✓ VerifiedAnalyzes email subject lines and generates optimized variants applying open-rate best practices like curiosity gaps, personalization, urgency, and length optimization.
v1.0.0
MIT
☐ 891 installsby vibecodin.gg
email-marketingsubject-linesconversion-optimizationcopywritinga-b-testingmarketing-automation
Tested with: claude-sonnet-4-6
Created: 2026-04-04|Updated: 2026-04-04
Trigger: Invoke when you need to improve email subject lines for better open rates, A/B test variations, or analyze existing subject line performance.
Commands:
optimize — Generate 5-7 optimized subject line variants with detailed reasoning for each improvementanalyze — Evaluate current subject lines against industry best practices and provide specific feedbackInstall
Install this skill to your local environment via the CLI.
vibecodin install email-subject-line-optimizerDon't have the CLI? npm install -g vibecodin
↓ Download FilesExtract to .claude/skills/email-subject-line-optimizer/