Dec 5 , 04:00 EST Resolved - Between 3:48am (US Eastern) and 4:10am (US Eastern) Cloudflare experienced an outage which affected Klaviyo. During this time, users were unable to access Klaviyo.com and all Klaviyo APIs. During this window, a number of services were affected.
Cloudflare incident disrupting Klaviyo
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December 5, 2025
domain
klaviyo