📧 Email Subject Line Analyzer
Type an email subject line and get an instant score with actionable feedback to improve open rates.
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What makes a great subject line?
The best email subject lines are 30–50 characters long (fits mobile screens), contain power or emotional words that spark curiosity or urgency, avoid ALL CAPS and excessive punctuation, and are specific rather than vague. Personalization tokens (first name) can lift open rates 10–26%.
Avoid spam trigger words like "free", "guaranteed", "act now", "winner", and excessive exclamation marks — these damage deliverability.