Email Marketing Platforms · reliability comparison
Campaign Monitor vs Mailchimp: which is more reliable? (2026)
Campaign Monitor is more reliable than Mailchimp, scoring 59.2 vs 55.1 out of 100. Over the last 90 days Campaign Monitor reported 1 incident and Mailchimp reported 7, with effective uptime of 99.50% and 99.28% respectively. Mailchimp resolves incidents faster on average (1d 1h).
Data updated Nov 1, 2026 · How we score
| Metric | Campaign Monitor | Mailchimp |
|---|---|---|
| Reliability score | 59.2 | 55.1 |
| Rank (email marketing platforms) | #12 | #13 |
| Uptime (90 days) | 99.50% | 99.28% |
| Incidents (90 days) | 1 | 7 |
| Partial / major outages | 0 | 0 |
| Avg time to resolve | 3d | 1d 1h |
| Outages we detected | 0 | 0 |
| Transparency score | 100/100 | 100/100 |
Where Campaign Monitor and Mailchimp differ
- Mailchimp reported 7× as many incidents as Campaign Monitor over the last 90 days (7 vs 1).
- Mailchimp fixes problems faster: 1d 1h on average, against 3d for Campaign Monitor (2.8× quicker).
- Campaign Monitor's longest outage on record lasted 1h 9m (Jul 16, 2026); Mailchimp's lasted 3d (Oct 9, 2026).
90-day uptime
Campaign Monitor
Mailchimp
- No incidents
- Degraded
- Partial outage
- Major outage
- No data
Recent Campaign Monitor incidents
- Degraded performanceSep 4, 2026 · resolved in 17d 1h
- MaintenanceAug 9, 2026 · resolved in 1h 10m
Recent Mailchimp incidents
- Degraded performanceOct 29, 2026 · resolved (duration not published)
Access Issues and Errors Across Mailchimp
Affected: Access Issues and Errors Across Mailchimp
- Degraded performanceOct 27, 2026 · resolved in 1d 2h
Access Issues and Errors Across Mailchimp
Affected: Access Issues and Errors Across Mailchimp
- Degraded performanceOct 9, 2026 · resolved in 10d 12h
Cropped Images Disappearing in Campaigns
Affected: Cropped Images Disappearing in Campaigns
- Degraded performanceSep 11, 2026 · resolved in 2h 37m
Delayed updates to All Contacts table
Affected: Delayed updates to All Contacts table
- Degraded performanceAug 13, 2026 · resolved (duration not published)
Campaign links resulting in "500" errors.
Affected: Campaign links resulting in "500" errors.
- Degraded performanceAug 4, 2026 · resolved (duration not published)
Affected: Campaign Click Tracking Issue
Other email marketing platforms to consider
- Drip · #1 · 100% uptime
- MailerLite · #2 · 100% uptime
- Omnisend · #3 · 100% uptime
- AWeber · #4 · 100% uptime
See the full most reliable email marketing platforms ranking →