Seven of the ten marketing platforms StatusBird tracks finished the last 90 days with a perfect 100% uptime and zero incidents: ActiveCampaign, Attentive, Drip, HubSpot, Mailchimp, Postscript, and SendGrid. Klaviyo, the platform most e-commerce stores actually depend on, landed mid-pack at 99.74% with two incidents, and Intercom brought up the rear at 99.17% with four.
All figures come from StatusBird's independent status monitoring, checked every 2 minutes over the 90 days ending July 2026. Here is the full ranking, followed by what each platform's numbers actually mean.
Email and SMS marketing platform rankings, 90 days to July 2026
| Rank | Service | 90-Day Uptime | Grade | Incidents |
|---|---|---|---|---|
| 1 (tie) | ActiveCampaign | 100% | A+ | 0 |
| 1 (tie) | Attentive | 100% | A+ | 0 |
| 1 (tie) | Drip | 100% | A+ | 0 |
| 1 (tie) | HubSpot | 100% | A+ | 0 |
| 1 (tie) | Mailchimp | 100% | A+ | 0 |
| 1 (tie) | Postscript | 100% | A+ | 0 |
| 1 (tie) | SendGrid | 100% | A+ | 0 |
| 8 | Omnisend | 100% | A+ | 2 |
| 9 | Klaviyo | 99.74% | B+ | 2 |
| 10 | Intercom | 99.17% | B | 4 |
How each marketing platform performed
Mailchimp: 100% uptime, 0 incidents
Mailchimp is still the most widely used email platform among small stores, covering campaigns, basic automations, and landing pages. Zero major or critical incidents across 43,000+ checks this window. A clean quarter from the biggest name in the category.
SendGrid: 100% uptime, 0 incidents
SendGrid is the transactional email backbone for thousands of stores: order confirmations, shipping notices, password resets. Transactional infrastructure failing is worse than a delayed newsletter, so its perfect record over 61,000+ checks matters more than most on this list.
HubSpot: 100% uptime, 0 incidents
HubSpot bundles email marketing with CRM and automation, and is common among stores selling B2B or higher-touch products. It went the full 90 days without an incident.
ActiveCampaign: 100% uptime, 0 incidents
ActiveCampaign focuses on automation-heavy email and light CRM for small and mid-size merchants. Another flawless record: 100% uptime, A+ grade.
Attentive: 100% uptime, 0 incidents
Attentive is one of the two dominant SMS marketing platforms in e-commerce. SMS is a real-time channel, so outages are unusually visible to customers. None occurred in this window.
Postscript: 100% uptime, 0 incidents
Postscript is Attentive's main rival for Shopify SMS marketing. It matched Attentive check for check: zero incidents across more than 61,000 probes.
Drip: 100% uptime, 0 incidents
Drip is an e-commerce-focused email automation tool positioned as a lighter Klaviyo alternative. Its 90-day record was spotless.
Omnisend: 100% uptime, 2 incidents
Omnisend combines email and SMS for e-commerce and is popular with Shopify merchants on a budget. It technically logged two incidents, but they totaled just 4 minutes of downtime, about 2 minutes each, most recently on April 30, 2026. That is why its uptime still rounds to 100% and its grade stays A+: two blips that short are operationally invisible.
Klaviyo: 99.74% uptime, 2 incidents
Klaviyo is the default email and SMS platform for serious Shopify stores, running the abandoned-cart and post-purchase flows that drive real revenue. Its two incidents totaled 326 minutes, averaging 163 minutes each, with the most recent on June 12, 2026. Two multi-hour outages in a quarter is not a crisis, but it is enough to interrupt scheduled campaigns and delay flow sends. We took a longer look at this question in is Klaviyo reliable.
Intercom: 99.17% uptime, 4 incidents
Intercom handles customer messaging, chat, and increasingly AI-driven support alongside marketing messages. Four incidents totaling 1,028 minutes, roughly 17 hours, averaging 257 minutes each, most recently on June 11, 2026. Four separate incidents is the highest count in this category and suggests recurring instability rather than one bad day. If live chat is a sales channel for you, this is the number to watch.
The pattern worth noticing
The platforms with perfect records skew toward pure email sending, while the two weakest scores belong to platforms doing real-time work: Klaviyo's event-triggered flows and Intercom's live messaging. Real-time systems have more ways to fail, and this quarter they did. It is also a reminder that market leadership and reliability are different things; Klaviyo dominates the category and still finished ninth of ten.
How we measure reliability
StatusBird checks each platform's status independently every 2 minutes and aggregates results over the trailing 90 days, current as of July 2026. Availability counts major and critical outages only; minor degradation is excluded. Grades run from A+ to F based on uptime and incident history. Live figures for every service are on the StatusBird reliability tracker, with deeper analysis in the State of E-commerce Infrastructure 2026 report.
Hear about the outage before your flows miss a send
StatusBird monitors Klaviyo, Mailchimp, Attentive, and every platform on this list every 2 minutes and sends you an SMS the moment a status change is detected, so you know whether to hold that campaign before it half-sends. Monitor your marketing stack alongside Stripe, Shopify, and 80+ other e-commerce services in one dashboard. Start monitoring free.