Integrate with Constant Contact



Klaviyo's Constant Contact integration is designed to help you move from Constant Contact to Klaviyo. We don't recommend using both platforms at once other than during the interim period as you make the switch.

We also have a general checklist that covers how to completely migrate over to Klaviyo from a different Email Service Provider (ESP) here.

From Constant Contact, Klaviyo pulls in:

  • When someone received, opened, or clicked a particular email
  • A list of emails who have unsubscribed or bounced
  • Existing lists in Constant Contact; you can choose to create Klaviyo lists from Constant Contact lists
If you delete people in Constant Contact, they will not also be deleted in Klaviyo. However, if people are added to a Constant Contact list that is synced with a Klaviyo list, they'll be added to Klaviyo within an hour.

Enable the Constant Contact Integration

Click on the Integrations tab in the left sidebar of your account.

Navigate to the All Integrations tab and find Constant Contact on the list of available integrations and click Add Integration. You will be taken to a Settings window where you click Connect to Constant Contact.


When you click Connect to Constant Contact, you will be brought to Constant Contact to login and connect (authenticate) with Klaviyo.


Once you've done that, you'll be brought back to the Integrations page when you can adjust Advanced Settings

Monitor the Klaviyo Sync

Once you've connected Klaviyo with Constant Contact, data will start syncing within a minute or two. If you navigate to the Metrics tab in your Klaviyo account, you should see a several metrics for Constant Contact data (received email, opened email, and clicked email) each with a Constant Contact icon next to it.


Once your sync is complete, you'll see Constant Contact on your Enabled Integrations list.

Frequency of the Klaviyo Sync

Klaviyo will run an initial sync of all historical data as soon as you click Update Constant Contact SettingsMoving forward, however, Klaviyo will sync data on an ongoing basis once an hour.

Best Practices

To ensure that you maintain good deliverability, you should only send your first few email campaigns to an engaged segment of your list(s) from Constant Contact. Since you'll have open and click data from Constant Contact, you'll be able to use this to segment your list.

If you email your subscribers more than once a week, you should send your first week of email campaigns to an engaged segment defined as follows:

Opened Email at least once in the last 120 days
OR Clicked Email at least once in the last 120 days
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