Free Tool
Cold Email Subject Line Grader
Paste your subject line below and get an instant score with specific improvement suggestions.
What Makes a Great B2B Subject Line?
✓ Specific over generic
Generic lines signal mass email. Reference their role, company, or industry.
✓ Under 50 characters
70% of B2B email opens are on mobile. Long subject lines get cut off.
✓ Direct question format
Questions invite response. "Is X a priority?" works better than statements.
✓ Specific numbers
Numbers signal data. "34% reduction" is more credible than "big improvement".
✗ Avoid curiosity-gap only
Without relevance, curiosity-gap lines are deleted as suspected spam.
✗ No ALL CAPS
All-caps triggers spam filters and looks aggressive to business recipients.
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