Analyze Email Subject Lines
Analyze email subject lines for open rates and engagement. Score your subjects for spam triggers, length, and impact. Free email subject line tester.
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What subject line length gets the highest open rates?
Research indicates that subject lines between 30-50 characters (6-10 words) tend to achieve the highest open rates. Mobile devices show approximately 30-40 characters in the preview, making shorter subjects crucial for mobile-heavy audiences. The analyzer checks length for both desktop and mobile preview scenarios.
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