A New, Native Integration for Klaviyo

Track Marketing Campaigns and Seamlessly Pair with Your Ecommerce Data

Estuary’s new in-house Klaviyo capture connector brings real-time speed to your marketing data. This native rendition applies Estuary’s signature speed and efficiency to your Klaviyo data so you can get caught up on historical data and backfills in record time.

The new connector provides:

• 15 data streams including Campaigns, Events, Forms, and more
• 5x faster backfills on events streams
• Parallel streaming on all data resources
• Lookback window to capture resources with eventual consistency

Pair it with Estuary’s native Shopify connector to capture message clicks right alongside sales events.

In with the New

You had feedback. We listened.

The native Klaviyo capture connector replaces an older version based on a third-party open-source connector. To improve performance and reliability, we decided to build a new connector from the ground up.

Due to Klaviyo’s delayed eventual consistency, the old connector could miss events, affecting downstream analysis. The new connector uses a dual-stream method so you don’t need to compromise between real-time insights and capturing delayed events. The real-time stream captures the bulk of events as they happen while a delayed stream acts as a lookback window to fill in any missing data.

And, since Klaviyo can generate a lot of events to ingest, the old connector could fall behind, especially when backfilling historical data. The new native connector implements concurrent processing to ingest chunks of data 5x faster for the events stream. With parallel processing across all streams, users can therefore see up to 10x performance improvements.

We gave Klaviyo the in-house treatment so we could provide a connector that reflects Estuary’s ethos: faster and more reliable.

We will therefore be deprecating the old third-party Klaviyo connector and encourage all users to migrate to the native connector for a better experience. Don't hesitate to reach out if you have any questions around this update.

Connector Highlights

• Supported Data Resources
  • campaigns
  • forms
  • events
  • metrics
  • segments
  • And more. See the full list of available streams.
• Seamless Real-Time Integration – Automatic schema mapping to Flow collections for instant use in downstream analytics.
• Enterprise Flexibility – Configure start dates and window sizes to match your operational needs.
• Backfill Support – Seamlessly replicate your historical Klaviyo data to kickstart your analysis.

Built for Enterprises

Like every connector in Estuary Flow, the Klaviyo integration benefits from our unified, enterprise-ready platform:

• Real-Time + Batch in One Platform – Stream marketing interactions as they happen alongside historical datasets without maintaining separate tools.
• Declarative Pipelines – Simplify complex ingestion workflows while ensuring consistency and governance.
• Secure Deployment Options – Choose fully managed, hybrid, or bring-your-own-cloud (BYOC) deployments for full control and compliance.

Getting Started

To begin streaming Klaviyo data into Flow, you’ll need:

1. A Klaviyo account with Owner or Admin permissions
2. A Private API Key for Klaviyo

Once configured in the Flow web application (or via your catalog spec for code-driven workflows), your Klaviyo data will be continuously ingested and ready for action.

📚 Find more setup instructions: Read the Klaviyo Connector Documentation →

With the new Klaviyo connector, Estuary Flow helps you bring your marketing data to life without compromise: why choose between real-time insights and historical accuracy when you can have both?