Cold email subject line generator · Used by 8,000+ SDRs
Cold email subject lines that get opened
In 2 minutes, get 10 proven cold email subject lines customized to your prospect and product.
Free · 10 variations · Copy instantly
THE PROBLEM
Cold email subject lines are the only thing that matters.
If they don't open, nothing else you wrote matters. Get this right first.
01
Your cold email is brilliant. Your offer is perfect. But it never gets read because the subject line killed it.
02
The average executive gets 121 emails a day. You have 3 seconds and 41 characters to earn the open.
The best cold email subject lines don’t sell. They spark curiosity and earn the click.
03
Great subject lines feel personal. They address pain points. They make prospects want to read more.
Generate 10 proven cold email subject lines
6 inputs. 2 minutes. Instantly copy high-converting cold email subject lines.
THE NEXT MOVE
Want higher open rates and more replies?
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.
Raju Bhupatiraju
20+ years at Oracle & Xerox · Author of “Magical Selling”
15 minutes with Raju. Build outbound that works.
HOW IT WORKS
What makes cold email subject lines work
The 3-second test
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 vs. clarity
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.
Personalization that works
"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.
Length matters
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.
FAQ
Frequently asked questions
What is a good open rate for cold emails?
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.
Should I use the prospect’s name in the subject line?
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.
What subject line formulas get the highest open rates?
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.
How do I A/B test cold email subject lines?
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.
What words should I avoid in cold email subject lines?
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.