Marketing Automation & CDPs · 2026 reliability ranking
Most Reliable Marketing Automation & Customer Data Platforms (2026)
We ranked 15 marketing automation platforms by real-world reliability over the last 90 days, using 72 status page incidents and our own around-the-clock uptime checks. Marketing automation platforms and customer data platforms collect events from your website and app and use them to send emails, texts, push messages and audience updates. When one has an outage, scheduled campaigns and triggered messages such as cart reminders or welcome series go out late or not at all, and tracking events can be delayed or lost. A missed send on a sale day or a gap in customer data costs revenue that is hard to recover afterwards.
Last updated Nov 1, 2026 · How we score
| # | Vendor | Score | Uptime (90d) |
|---|---|---|---|
| 1 | HubSpot Marketing HubHubSpot Marketing Hub is the email marketing and marketing automation product within HubSpot's CRM platform. | 96.2 | 100% |
| 2 | Customer.ioCustomer.io is a messaging automation platform for sending behaviour-triggered email, push, SMS and in-app messages. | 96.2 | 99.99% |
| 3 | IterableIterable is a San Francisco-based cross-channel marketing platform for email, SMS, push and in-app campaigns and customer journeys. | 93.7 | 99.96% |
| 4 | RudderStackRudderStack is a customer data platform that collects event data and sends it to data warehouses and marketing and analytics tools. | 93.0 | 99.94% |
| 5 | HightouchHightouch is a composable customer data platform that syncs customer data from a company's data warehouse into marketing, sales and advertising tools. | 89.2 | 99.92% |
| 6 | OptimoveOptimove is a customer data and CRM marketing platform for segmenting customers and running multichannel campaigns, used heavily in retail and gaming. | 80.0 | 99.88% |
| 7 | CensusCensus is a reverse-ETL and data activation tool, now part of Fivetran, that syncs customer data from a data warehouse into business and marketing tools. | 78.8 | 99.72% |
| 8 | BrazeBraze is a New York-based customer engagement platform for sending cross-channel messages such as push notifications, email, SMS and in-app messages based on user data and behaviour. | 78.0 | 99.65% |
| 9 | MoEngageMoEngage is a customer engagement platform for push, email, SMS, in-app and web campaigns, founded in India and headquartered in San Francisco. | 77.3 | 99.69% |
| 10 | Bloomreach EngagementBloomreach Engagement (formerly Exponea) is the customer data and marketing automation product from Bloomreach, used mainly by ecommerce businesses. | 67.3 | 99.39% |
| 11 | KlaviyoKlaviyo is an email and SMS marketing platform aimed at ecommerce businesses, headquartered in Boston. | 62.2 | 99.26% |
| 12 | Twilio SegmentTwilio Segment is a customer data platform owned by Twilio that collects website, app and server events and routes them to analytics, marketing and warehouse tools. | 60.5 | 99.35% |
Marketing Automation & CDPs reliability at a glance
- Across the 12 ranked marketing automation platforms, average 90-day uptime is 99.73%. Reliability scores range from 96.2 (HubSpot Marketing Hub) to 60.5 (Twilio Segment).
- Together they published 72 incidents in the last 90 days, 21 of them partial or major outages.
- The typical vendor takes 2h 52m to resolve an incident. Customer.io is fastest, at 19m on average.
- Klaviyo reported the most incidents (13 in 90 days).
What to check before you choose a marketing automation platform
- Check which components fail most often: event ingestion and message sending matter more than the reporting dashboard, which can catch up later.
- Ask what happens to events and triggered messages during an outage: are they queued and replayed, or dropped?
- Many of these platforms run separate clusters or regions, so find out which one your account will live on and read that cluster's incident history.
- Look at incidents caused by email, SMS and ad-network partners as well as the vendor's own systems, and subscribe to the status page before a big campaign.
90-day uptime history
Each bar is one day. Hover a bar for that day's uptime and incidents.
1. HubSpot Marketing Hub
100% uptime · 10 incidents · avg resolve —2. Customer.io
99.99% uptime · 5 incidents · avg resolve 19m3. Iterable
99.96% uptime · 4 incidents · avg resolve 1h 12m4. RudderStack
99.94% uptime · 3 incidents · avg resolve 57m5. Hightouch
99.92% uptime · 9 incidents · avg resolve 1h 14m6. Optimove
99.88% uptime · 1 incidents · avg resolve 15h 59m7. Census
99.72% uptime · 5 incidents · avg resolve 2h 13m8. Braze
99.65% uptime · 4 incidents · avg resolve 2h 52m9. MoEngage
99.69% uptime · 6 incidents · avg resolve 3h 5m10. Bloomreach Engagement
99.39% uptime · 2 incidents · avg resolve 6h 42m11. Klaviyo
99.26% uptime · 13 incidents · avg resolve 3h 39m12. Twilio Segment
99.35% uptime · 10 incidents · avg resolve 8h 15m- No incidents
- Degraded
- Partial outage
- Major outage
- No data
Being tracked (not ranked yet)
These vendors join the ranking once we have enough evidence: at least 14 days of data, and for vendors with a quiet status page (silent for a year, or for 90 days while their competitors report several incidents), 30 days of our own independent monitoring.
- CleverTap · quiet status page, awaiting our own monitoring
- Adobe Marketo Engage
- Salesforce Marketing Cloud
Recent Marketing Automation & CDPs incidents
Bloomreach Engagement - Application access disruption, login is unavailable
Affected: C7S, CA1, CIN, CIS, ENG, EU1 +8 more
Affected: Email Sending, Text Message Sending, WhatsApp Sending, Mobile Push Sending
Affected: Email Sending, Text Message Sending, WhatsApp Sending, Mobile Push Sending, Processing
Some customers using Sparkpost (US hosted) for email may be seeing delayed or slow sends
Affected: Global Campaign Sends
Dashboard Login and Sign-Ups via Google failing
Affected: Dashboard, Dashboard, Dashboard, Dashboard, Dashboard, Dashboard
Dashboard-04 – Campaign Engagement Statistics Delayed
Affected: Campaign Stats
Customer.io UI is currently unavailable for some customers
Affected: Management Interface
Campaigns v1 and Push API Service Disruption
Affected: Push APIs, Push APIs, Push APIs, Push APIs, Push APIs, Push APIs +1 more
Head-to-head comparisons
- HubSpot Marketing Hub vs Customer.io reliability
- HubSpot Marketing Hub vs Iterable reliability
- HubSpot Marketing Hub vs RudderStack reliability
- HubSpot Marketing Hub vs Hightouch reliability
- Customer.io vs Iterable reliability
- Customer.io vs RudderStack reliability
- Customer.io vs Hightouch reliability
- Iterable vs RudderStack reliability
- Iterable vs Hightouch reliability
- RudderStack vs Hightouch reliability
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Frequently asked questions
What is the most reliable marketing automation platform?
Based on the last 90 days of data, HubSpot Marketing Hub is the most reliable marketing automation platform we track, with a reliability score of 96.2/100 and 100% uptime.
How do you measure marketing automation platform reliability?
We poll each vendor's public status page every few minutes, record every incident, and run our own uptime checks against each vendor's login and customer-facing pages. Uptime (40%), incident frequency (20%), average time to resolve (20%) and transparency (20%) combine into one score out of 100.
How often are these rankings updated?
Continuously. Status pages and uptime checks run every five minutes and scores are recalculated several times an hour.
Can vendors pay to rank higher?
No. Sponsored placements are clearly labelled, shown separately from the rankings and never change a vendor's score.