CL CalcLabHub
AI

Email Subject Line Generator

Tell us what your email is about, and we'll generate 10 subject lines proven to drive opens. Pick the one that fits your voice.

Email subject line statistics

  • 35–50 characters is the sweet spot
  • Personalization (first name) lifts open rates by ~10%
  • Numbers in subjects boost opens (e.g. "5 tips" vs "Some tips")
  • Emoji can help — but 1 max, and only if brand-appropriate
  • Lowercase looks conversational, Title Case looks formal
  • Avoid spam triggers: FREE, ACT NOW, $$$, !!!, "guaranteed"

Frequently asked questions

What makes a good email subject?

Specific, personalized, under 50 chars, creates curiosity or value.

Open-rate tricks?

Numbers, brackets, lowercase, emoji sparingly.