Marketing Automation & CDPs · reliability comparison
Customer.io vs Iterable: which is more reliable? (2026)
Customer.io is more reliable than Iterable, scoring 96.2 vs 93.7 out of 100. Over the last 90 days Customer.io reported 5 incidents and Iterable reported 4, with effective uptime of 99.99% and 99.96% respectively. Customer.io resolves incidents faster on average (19m).
Data updated Nov 1, 2026 · How we score
| Metric | Customer.io | Iterable |
|---|---|---|
| Reliability score | 96.2 | 93.7 |
| Rank (marketing automation platforms) | #2 | #3 |
| Uptime (90 days) | 99.99% | 99.96% |
| Incidents (90 days) | 5 | 4 |
| Partial / major outages | 0 | 0 |
| Avg time to resolve | 19m | 1h 12m |
| Outages we detected | 0 | 0 |
| Transparency score | 100/100 | 100/100 |
Where Customer.io and Iterable differ
- Customer.io reported 25% more incidents than Iterable over the last 90 days (5 vs 4).
- Customer.io fixes problems faster: 19m on average, against 1h 12m for Iterable (3.8× quicker).
- Customer.io's longest outage on record lasted 2h 42m (Jun 13, 2026); Iterable's lasted 40m (Jul 16, 2026).
90-day uptime
Customer.io
Iterable
- No incidents
- Degraded
- Partial outage
- Major outage
- No data
Recent Customer.io incidents
- Degraded performanceOct 27, 2026 · resolved in 25m
Customer.io UI is currently unavailable for some customers
Affected: Management Interface
- Degraded performanceSep 19, 2026 · resolved in 27m
Some US customers may experience delays in message sending
Affected: Message Sending
- InformationalSep 4, 2026 · resolved in 1h 19m
Reduced Deliverability to Microsoft-Hosted Email Addresses
Affected: Message Sending
- Degraded performanceSep 3, 2026 · resolved in 5m
- InformationalAug 5, 2026 · resolved in 26m
Customer.io UI is inaccessible
Affected: Management Interface
Recent Iterable incidents
- Degraded performanceOct 28, 2026 · resolved in 29m
Some customers using Sparkpost (US hosted) for email may be seeing delayed or slow sends
Affected: Global Campaign Sends
- Degraded performanceSep 22, 2026 · resolved in 56m
Timeouts on User Update API Endpoints
Affected: Global API Success
- Degraded performanceSep 10, 2026 · resolved in 2h 23m
EU platform slowness and gateway errors
Affected: Global Web Application, Global API Success, Global Journey Processing
- Degraded performanceSep 1, 2026 · resolved in 58m
Subset of customers using Twilio for SMS seeing a portion of messages getting droppped
Affected: Global Campaign Sends
Other marketing automation platforms to consider
- HubSpot Marketing Hub · #1 · 100% uptime
- RudderStack · #4 · 99.94% uptime
- Hightouch · #5 · 99.92% uptime
- Optimove · #6 · 99.88% uptime
See the full most reliable marketing automation & customer data platforms ranking →