Klaviyo change history

Klaviyo reported a major degradation in flow message sending starting 2026-10-17 17:01 UTC, with some customers’ flow emails delayed; immediate sends remained unaffected. The incident was still open when archived, after 1 h 4 min at the last update. Klaviyo said it had identified the cause and was working on a fix, without specifying either.

Klaviyo reported a critical incident preventing some customers from logging in or loading app pages, starting 2026-10-08 15:00 UTC and resolved at 2026-10-08 16:13 UTC (reported duration: 1 h 12 min). A fix restored access; campaign and flow sending were not impacted, and customers logged out during the incident may need to log in again.

Klaviyo reported a major degradation starting 2026-08-27 00:09 UTC: some profiles stalled at flow time delays, affecting email, text messaging, push, and WhatsApp sending. Campaigns and flows without time delays were unaffected. A fix was deployed and affected-message processing completed; the incident resolved at 2026-08-27 03:42 UTC after 3 h 33 min.

Klaviyo reported a major incident affecting SMS subscriptions, delaying SMS sends, and causing errors creating or scheduling SMS and WhatsApp campaigns. It started at 2026-07-21 20:36 UTC and was resolved at 2026-07-21 21:09 UTC, lasting 32 min. Klaviyo implemented a fix but did not disclose the cause.

Klaviyo reported a major outage affecting WhatsApp messaging, Meta integrations, and Instagram connectivity from 2026-06-12 14:49 UTC to 2026-06-12 17:30 UTC (2 h 40 min), caused by an upstream provider disruption. Services returned to normal; failed messages were reprocessed, but a small number that never reached Klaviyo could not be recovered.

Klaviyo reported a critical outage of all WhatsApp functionality, including message sending, integration setup and template editing, due to an upstream provider outage. The incident started at 2026-06-06 17:18 UTC and was marked resolved at 2026-06-06 23:05 UTC, lasting 5 h 47 min; Klaviyo confirmed services were restored after monitoring.

Klaviyo’s major Shopify API outage caused integration setup errors and data-sync delays from 2026-06-03 14:23 UTC to 2026-06-03 17:16 UTC, lasting 2 h 52 min. Klaviyo attributed it to a partial upstream-service outage; syncing returned to normal, with automated retries clearing backlogs and failed integration states. Customers whose new integration setup failed can retry.

A critical Klaviyo disruption affected klaviyo.com, APIs, message sending and event processing, potentially preventing logins and campaigns or flows. It started 2026-05-05 21:24 UTC and was resolved 2026-05-07 23:02 UTC (2 days 1 h). Services were restored by 2026-05-06 15:59 UTC; subsequent background recovery did not affect platform use.

Klaviyo reported major real-time segmentation delays affecting a subset of customers, with segments up to 2.5 hours out of date. The incident started at 2026-03-27 04:46 UTC and lasted 29 min, resolving at 2026-03-27 05:15 UTC. Engineering identified a solution, and Klaviyo confirmed real-time processing was restored.

Klaviyo reported a major campaign scheduling and sending incident starting 2026-01-12 11:12 UTC, lasting 1 h 10 min and resolved at 2026-01-12 12:23 UTC. New campaigns and scheduled RAST campaigns could not send; previously scheduled non-RAST campaigns continued processing. A fix restored service and all delayed campaigns were replayed; no data loss was expected.

Klaviyo reported a major incident affecting template cloning from the Template Library (Email Sending - Email Content), starting 2025-12-17 01:11 UTC and resolved at 2025-12-17 01:49 UTC (37 min). Engineering identified the cause, began implementing a fix, and later confirmed template cloning was fully restored.

Klaviyo reported a major Customer Agent Web Chat outage starting 2025-12-03 19:57 UTC, lasting 38 min and resolved at 2025-12-03 20:36 UTC. Missing follow-up prompts prevented users from continuing conversations or escalating to a human agent; SMS chat was unaffected. Klaviyo identified a recent change as the cause and restored prompts by reverting it.

Klaviyo reported a major outage affecting Helpdesk, Customer Hub, and Customer Agent’s onsite web chat, starting at 2025-11-28 20:27 UTC. The incident lasted 1 h 38 min and was resolved at 2025-11-28 22:05 UTC; Klaviyo reported restoring access and monitoring stability.

Klaviyo reported a major Cloudflare-related outage: onsite forms appeared, but requests, events and subscriptions did not process; preference pages errored and API calls returned 403s. It started 2025-11-18 13:58 UTC and resolved 2025-11-18 19:06 UTC, lasting 5 h 7 min. Fixes were implemented, and all affected components were operational at resolution.

Klaviyo reported a critical outage affecting login, sending and other services, caused by an upstream provider outage. The incident started at 2025-10-20 08:58 UTC and lasted 32 h 7 min, disrupting access and delaying sending, segmentation, unsubscribes and conversion attribution analytics. All services were restored, with resolution recorded at 2025-10-21 17:06 UTC.

Klaviyo reported a major incident affecting subscribe and unsubscribe pages for all profiles, potentially preventing marketing opt-ins and opt-outs. It started at 2025-10-01 02:16 UTC and was resolved at 2025-10-01 02:31 UTC, lasting 15 min; no cause or fix was stated.