In 2 minutes, get 10 proven cold email subject lines customized to your prospect and product.
Free • 10 variations • Copy instantly
The best cold email subject lines don't sell. They spark curiosity and earn the click.
If they don't open, nothing else you wrote matters. Get this right first.
6 inputs. 2 minutes. Instantly copy high-converting cold email subject lines.
Subject lines get you in the door. What you say next determines if you get a meeting. Let's build an outbound system that actually converts.
15 minutes with Raju. Build outbound that works.
Your subject line has 3 seconds to earn an open. In that time, the prospect decides: "Is this worth my attention or is it spam?" Generic subject lines lose instantly. The ones that win feel personal, specific, or genuinely interesting.
Curiosity works when the prospect doesn't know you: "Quick question about [Company]" creates intrigue. Clarity works when they might recognize value: "Reduce [pain] by 30%." Test both approaches—what works varies by audience and offering.
"Hey {First_Name}" isn't personalization—everyone does that. Real personalization references something specific: their recent funding, a job posting, a LinkedIn post. "Congrats on the Series B, [Name]" beats "Quick question about your sales team" every time.
Optimal subject line length: 4-7 words. On mobile (where 60%+ of emails are opened), long subject lines get cut off. "Quick question" (2 words) outperforms "I'd love to share some ideas about improving your sales process" (11 words). Brevity wins.
Industry benchmarks for B2B cold email: 15-25% is average, 25-40% is good, 40%+ is excellent. But open rate alone doesn't matter—reply rate does. A 50% open rate with 1% replies is worse than 25% opens with 5% replies. Focus on relevance and targeting, not just subject line tricks.
It depends. Using their first name can feel personal ("John, quick question") or it can feel automated (everyone does it now). Using their company name often works better ("Question about [Company]'s sales team"). Test both—the "right" answer varies by your audience and how saturated their inbox is.
Top performers: (1) "Quick question about [specific thing]" — creates curiosity, (2) "[Mutual connection] suggested I reach out" — leverages trust, (3) "Idea for [their specific challenge]" — promises value, (4) "[Company] + [Your Company]" — feels like partnership, (5) "Congrats on [recent news]" — shows you did research.
Split your list evenly (minimum 100 per variant for statistical significance). Test ONE variable at a time—subject line only. Send at the same time on the same day. Wait 48 hours before declaring a winner. Track both opens AND replies—a subject line that gets opens but not replies isn't winning.
Spam trigger words hurt deliverability: "Free," "Guaranteed," "Act now," "Limited time," excessive caps or punctuation (!!!, ALL CAPS). Also avoid anything that sounds like marketing: "Newsletter," "Monthly update," "We're excited to announce." Sound like a human, not a marketing department.