Free Email Subject Line Tester – Online Marketing Metrics

Email Subject Line Tester

Analyze your subject lines to increase open rates and avoid spam filters.

Your Subject Line is Your First Impression

35% of email recipients open email based on the subject line alone. It’s the single most important factor in determining whether your email gets opened or ignored. A great subject line is the key to a successful email marketing campaign.

How We Score Your Subject Line

Length & Word Count

We check if your subject line is within the optimal length (20-50 characters) to avoid being cut off on mobile devices.

Spam Trigger Words

Our analyzer scans for common words and phrases (like “free,” “act now,” “winner”) that can land your email in the spam folder.

Sentiment & Emotion

We analyze the emotional tone of your subject line. Positive, urgent, or curiosity-driven language can significantly boost open rates.

Use of Numbers & Personalization

Subject lines with numbers or personalization tokens (like [First Name]) often stand out in a crowded inbox and perform better.

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