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Email Subject Line Tester
Free AI email subject line tester and analyser. Paste up to 5 subject lines, select your audience and goal, and get instant scores, spam risk ratings, and improved alternatives. Powered by Gemini AI. Free for 3 uses per day.
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Frequently Asked Questions
What makes a good email subject line?
Effective subject lines are typically 6 to 10 words, create curiosity or urgency without being clickbait, avoid spam trigger words (free, guarantee, act now), are relevant to the recipient, and preview well on mobile (first 30 to 40 characters).
What is a spam risk score?
Spam risk is an assessment of how likely a subject line is to trigger spam filters or be perceived as spam by recipients. Spam trigger words, excessive punctuation, and ALL CAPS increase spam risk.
Can I test more than 5 subject lines?
The tool accepts up to 5 subject lines per analysis. To test more, run multiple analyses. Pro and Business subscribers can run unlimited analyses per day.
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