Free Email Subject Line Tester & Scorer
The subject line decides whether your email gets opened or ignored — it's doing more work than the whole message behind it. Good ones are the right length (they don't get cut off on mobile), avoid spammy words that trip filters, and feel personal rather than promotional. This tool scores yours on those factors and suggests improvements, so more of your emails actually get read.
Frequently Asked Questions
- What makes a good email subject line?
- Keep it under 50 characters, be specific, personalise where possible, create urgency without being spammy, and avoid ALL CAPS and excessive punctuation.
- What words trigger spam filters?
- Words like 'Free', 'Win', 'Guaranteed', and excessive exclamation marks can trigger spam filters. The scorer flags these and suggests alternatives.