Score your email subject lines for effectiveness. Check for spam triggers, analyze length, and get actionable improvement tips.
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Your subject line is the first impression your email makes. It determines whether someone opens it or sends it to trash. Studies show that 47% of email opens are based on subject line alone. A compelling subject line can increase your open rate by 50% or more. Testing and optimizing subject lines is one of the highest-ROI activities in email marketing.
Great subject lines are specific, create curiosity or urgency, and deliver on their promise. Use personalization when possible. Include numbers (they increase click-through rates). Keep it concise — most email clients show only 35-50 characters on mobile. Test different subject lines to see what resonates with your audience. Avoid spam trigger words and excessive punctuation.