customer.io vs mailman3.com
Market traction comparison · Updated Jul 2026
| customer.io | mailman3.com | Leads | |
|---|---|---|---|
| Monthly Visits | 725.7K | 654 | customer.io |
| Bounce Rate | 37.9% | 42.6% | customer.io |
| SEO & Keywords | 5 | 20 | mailman3.com |
| Domain Age | 14y 10m | 11y 4m | customer.io |
customer.io leads in 3 of 4 dimensions, while mailman3.com leads in 1.
Growth Momentum
| customer.io | mailman3.com | Leads | |
|---|---|---|---|
| Monthly Visits | 725.7K | 654 | customer.io |
| MoM Change | +17% | -43% | customer.io |
| Avg. Session | 6m49s | 1m24s | customer.io |
| Pages / Visit | 12.3 | 2.4 | customer.io |
Growth Momentum · Insight
mailman3.com is losing traffic (-43%) despite 654 monthly visits. customer.io's +17% growth puts it on a trajectory to overtake.
Acquisition Strategy
| customer.io | mailman3.com | Leads | |
|---|---|---|---|
| Primary Channel | Direct 76% | — | |
| Bounce Rate | 37.9% | 42.6% | customer.io |
| SEO & Keywords | 5 | 20 | mailman3.com |
Keyword Overlap Rate: 9%
Business Maturity
| customer.io | mailman3.com | Leads | |
|---|---|---|---|
| Domain Age | 14y 10m | 11y 4m | customer.io |
| Registered | Oct 2011 | Apr 2015 | |
| Expires | Oct 2026 | Apr 2027 |
Business Maturity · Insight
customer.io has been in the market for over a decade, indicating established presence.
Market Position
| customer.io | mailman3.com | Leads | |
|---|---|---|---|
| Global Rank | #41.0K | #12.9M | customer.io |
| Category Rank | #2.2K | — | |
| PH Upvotes | 144 | 0 | customer.io |
Market Position · Insight
Each has untapped markets the other serves: customer.io could expand into Germany, France, while mailman3.com could target United States, United Kingdom, Canada.
Key Takeaways
- •mailman3.com is losing traffic (-43%) despite 654 monthly visits. customer.io's +17% growth puts it on a trajectory to overtake.
- •customer.io receives 1109.6x more monthly traffic than mailman3.com (725.7K vs 654).
- •customer.io is growing (+17%) while mailman3.com is declining (-43%).
- •customer.io keeps visitors significantly longer (6m49s avg session vs mailman3.com's 1m24s), suggesting deeper product engagement or stickier content.
- •With only 9% keyword overlap, they target largely different search audiences.
- •mailman3.com has 4.0x more ranking keywords (20 vs 5), indicating broader SEO footprint.
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Report based on data from July 2026