How does the email subject line tester work?

Type your subject line and the tester scores it out of 100 in real-time. It checks character length, spam trigger words, power words, personalization tokens, emoji usage, and urgency signals.

What is a good email subject line score?

Aim for 70+ out of 100. Scores above 80 indicate strong subject lines that typically achieve above-average open rates. The tester provides specific recommendations to improve low scores.

What spam words does the tester detect?

The tester checks for 50+ common spam trigger words including "free," "guarantee," "act now," "limited time," and other phrases that can land your emails in spam folders.

Is the email subject line tester free?

Yes, completely free with no sign-up. Test unlimited subject lines. All analysis happens in your browser — we never store your email content.

Free Email Subject Line Tester

Analyze your email subject lines for open rate effectiveness — real-time scoring as you type

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Start typing your subject line above to see your score

Need help with your email marketing strategy?

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