Enter your subject line and get an instant score across 8 factors — length, spam words, curiosity, personalisation, and inbox preview.
The best cold email subject lines are short (4-7 words), specific, personalized, curiosity-driven, and avoid spam trigger words. They should feel like they came from a real person, not a marketing department.
A good cold email open rate is 40-60%. Above 50% is excellent. Open rates below 30% indicate subject line or deliverability issues that need to be addressed.
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