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Is your audience suffering from email newsletter fatigue? Are your email open rates declining?

You're not alone.

That's why email subject line testers are so popular. They give you a nice, neat score which, in theory, will help you craft better, more compelling subject lines.

But how accurate are these tools' ratings? Are they really a good predictor of how well your email subject lines will work?

Venngage tested 45 email subject lines using 3 of the most popular email subject line tools, to see if the scores they gave us reflected the actual open rates we got.

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