Email Subject Line Tester
Score your email subject line 0–100 — length, spam triggers, personalization and power words checked.
—Score / 100
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How to use
Type your subject line and get an instant 0–100 score with specific fixes.
Frequently asked questions
What makes a good subject line?
30–50 characters, no spam words (FREE!!!), one clear idea, and ideally a personal touch.
Does it check spam triggers?
Yes — ALL CAPS, excessive punctuation and classic spam words all lower your score.
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