Subject line checker
Enter a subject line and optional context. We grade it across six email heuristics (length, clarity, value, urgency, relevance, deliverability) and return an overall 0-100 score plus pointed suggestions.
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score
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Length
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–Keywords
–Mobile preview
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Suggested preheader
Add a preheader or we will recommend one.
Next steps
Targeted edits that usually unlock a stronger subject line.