Marketing Automation & CDPs · reliability comparison
Iterable vs Klaviyo: which is more reliable? (2026)
Iterable is more reliable than Klaviyo, scoring 93.7 vs 62.2 out of 100. Over the last 90 days Iterable reported 4 incidents and Klaviyo reported 13, with effective uptime of 99.96% and 99.26% respectively. Iterable resolves incidents faster on average (1h 12m).
Data updated Nov 1, 2026 · How we score
| Metric | Iterable | Klaviyo |
|---|---|---|
| Reliability score | 93.7 | 62.2 |
| Rank (marketing automation platforms) | #3 | #11 |
| Uptime (90 days) | 99.96% | 99.26% |
| Incidents (90 days) | 4 | 13 |
| Partial / major outages | 0 | 5 |
| Avg time to resolve | 1h 12m | 3h 39m |
| Outages we detected | 0 | 0 |
| Transparency score | 100/100 | 100/100 |
Where Iterable and Klaviyo differ
- Klaviyo reported 3.3× as many incidents as Iterable over the last 90 days (13 vs 4).
- Klaviyo had 5 partial or major outages, compared with 0 for Iterable.
- Iterable fixes problems faster: 1h 12m on average, against 3h 39m for Klaviyo (3.1× quicker).
- Iterable's longest outage on record lasted 40m (Jul 16, 2026); Klaviyo's lasted 2d 1h (May 5, 2026).
90-day uptime
Iterable
Klaviyo
- No incidents
- Degraded
- Partial outage
- Major outage
- No data
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
Recent Klaviyo incidents
- Partial outageOct 29, 2026 · resolved in 2h 10m
Campaign Sending Delaysofficial update ↗
Affected: Email Sending, Text Message Sending, WhatsApp Sending, Mobile Push Sending
- InformationalOct 28, 2026 · resolved in 23h 43m
Affected: Email Sending, Text Message Sending, WhatsApp Sending, Mobile Push Sending, Processing
- Partial outageOct 22, 2026 · resolved in 14h 47m
Outbound Webhook Delaysofficial update ↗
Affected: Analytics
- Partial outageOct 17, 2026 · resolved in 4h 49m
Flow Sending Delaysofficial update ↗
Affected: Email Sending, Text Message Sending, WhatsApp Sending, Mobile Push Sending, Flow Editor, Processing
- Degraded performanceOct 9, 2026 · resolved in 2h 6m
Analytics Events Processing Delays
Affected: Segments, Profiles, Analytics
- Major outageOct 8, 2026 · resolved in 1h 13m
Login and page loading issuesofficial update ↗
Affected: Klaviyo App
Other marketing automation platforms to consider
- HubSpot Marketing Hub · #1 · 100% uptime
- Customer.io · #2 · 99.99% uptime
- RudderStack · #4 · 99.94% uptime
- Hightouch · #5 · 99.92% uptime
See the full most reliable marketing automation & customer data platforms ranking →