Data from 50M+ Emails

The Numbers Don't Lie

Every statistic on this page is backed by real email data. No guesswork, no hypotheticals—just proven cold email numbers.

50M+
Emails Analyzed
2.1M
Responses Tracked
847K
Meetings Booked
12K
Campaigns Studied
Interactive Data

Explore the Numbers

48.7%
Average open rate with AI-personalized subject lines
vs. 21.3% for generic emails
72%
Best-in-class open rate
48.7%
Suplex average
21%
Industry average

What Drives Higher Open Rates?

AI-Personalized Subject
48.7%
Personalized (Manual)
35.8%
{{First_Name}} Merge Tag
27.2%
Generic Template
21.3%
Key Metrics

Critical Cold Email Numbers

Subject Line Length Optimal
4-7
Words in subject line for highest open rates. Shorter is better.
Email Length Optimal
50-125
Words in email body. Sweet spot for response rates.
Follow-up Sequence Recommended
4-7
Touchpoints in sequence. 70% of responses come from follow-ups.
Follow-up Interval Optimal
3-4
Days between follow-ups. Maintains presence without spamming.
Best Send Hour Peak Performance
10 AM
Local time of recipient. 23% higher open rates vs. average.
Best Send Day Peak Performance
Tuesday
Tuesday and Wednesday outperform by 18% on average.
Personalization Depth AI-Powered
8.9%
Response rate with deep AI personalization vs 1.2% generic.
List Quality Impact Critical
3.2x
Difference in results between verified and unverified lists.
Benchmark Matrix

Cold Email Performance Matrix

Metric Poor Average Good Excellent Suplex Avg
Open Rate <15% 15-25% 25-40% 40%+ 48.7%
Click Rate <1% 1-3% 3-8% 8%+ 14.2%
Response Rate <1% 1-3% 3-8% 8%+ 8.9%
Meeting Rate <0.5% 0.5-1% 1-3% 3%+ 2.4%
Bounce Rate >5% 3-5% 1-3% <1% 0.8%
Unsubscribe Rate >1% 0.5-1% 0.2-0.5% <0.2% 0.05%
Spam Rate >0.3% 0.1-0.3% 0.05-0.1% <0.05% 0.008%
The Math

The Cold Email Success Formula

Example: 10,000 emails with Suplex performance metrics
10,000 Emails Sent
×
48.7% Open Rate
×
8.9% Response Rate
×
27% Meeting Rate
=
117 Meetings Booked

With an average deal size of $5,000 and 20% close rate, that's $117,000 in new revenue from one campaign.

70%
Responses from Follow-ups
Not the first email
4.2x
More Likely to Buy
With personalized emails
$42
Cost Per Lead
vs $198 industry avg
3-5 PM
Worst Send Time
42% lower open rates

Let the Numbers Work for You

Every Suplex campaign is optimized based on these proven metrics

Start Free Trial Download Full Report