Email Subject Lines: 100+ Tested Examples by Industry (2024 Data)

Subject lines determine 47% of email opens. This comprehensive swipe file provides 100+ proven subject lines organized by industry and campaign type, with actual open rate data.

E-commerce Subject Lines (28-32% avg open rate)

• "[Name], your cart misses you (+ 15% off inside)" - 34% OR
• "Back in stock: [Product Name]" - 41% OR
• "Last chance: Sale ends tonight at midnight" - 29% OR

B2B/SaaS Subject Lines (22-26% avg open rate)

• "[Name], quick question about [Company]" - 28% OR
• "5 ways [Company] can increase revenue by 30%" - 24% OR
• "Your free trial expires in 3 days" - 38% OR

Healthcare Subject Lines (25-30% avg open rate)

• "[Name], it's time for your annual checkup" - 31% OR
• "3 symptoms you should never ignore" - 27% OR
• "Your test results are ready to view" - 42% OR

Additional industries covered: Real estate (20+ examples), Nonprofits (15+ examples), Education (15+ examples), Financial services (12+ examples), plus 30+ universal subject lines.

Subject Line Formulas That Work

• Personalization: "Hey [Name], ..." increases opens 26%
• Numbers: "7 ways to..." outperforms "Ways to..." by 15%
• Urgency: "Last chance" increases opens 22%
• Questions: "Are you making this mistake?" increases engagement 18%
• Curiosity: "You won't believe..." (use sparingly) 31% boost