MailChimp is an extensive email marketing solution designed for brands and companies of any size. Send targeted campaigns, newsletters, and automated messages. Choose from a broad range of excellent templates and pre-made campaigns or customize with flexible design. Subscription management, custom reports, and advanced analytics allow for great insights. The full scope of hundreds of integrations and comprehensive mobile options make this one of the most versatile marketing tools out there.

Start saving time and set up a connection with one of your favorite apps.



We need permission to access both your accounts, this is necessary to keep your accounts in sync. 

*****For getting the most out of Mailchimp and BEST Practices of how to setup Lists, a Master List and Groups please click here. This will show you how to work with a Master List vs multiple lists so you can move people easily through your funnel for example from PROSPECT to CUSTOMER etc.*****

When you set up groups with group options in Mailchimp you will be able to use PieSync to move these changes (for example from Prospect to Customer) as you make them into your other apps. If you use lists PieSync will not be able to move people from one list to the other. 

In MailChimp, we need you to log in to your account and allow access to a certain List or Master List. When you click 'Authorize MailChimp', a pop-up window appears to log in and then another window that visualizes the lists to choose from. 

Why do I need to authorize each subset of my MailChimp contacts?

How does this translate when setting up Multiple Rules: OPTION 1

How does this translate when setting up Multiple Rules: OPTION 2 

Don't worry, though, we treat your data securely with absolute confidentiality!


For each step in the configuration, we have a separate help article available in the PieSync Help Centre. For ease of reference, we linked them in the subtitles below. 


Choose the filter for each app to define the subset of contacts you want to keep in sync. Setting up more than one rule is available from the Medium plan onward.

For MailChimp, authorization is required per list subset. Therefore, this already happens in the Authorization Step as described above. 

Keep in mind some important side notes in regards to the availability of Multiple Rules. Want to set up more than one rule? Check out here how to do this!

Once you have chosen your filter(s), you can continue with the rest of the configuration as described in the steps below. Bear in mind that not all steps/features are available in each connection.  Don't hesitate to drop us a line at in case you have further questions!


In between your filters you are able to choose the direction of your sync in the drop-down menu. Choose to sync two-way or one-way in either direction.


Only syncing contacts with an email address, as this is the field we use to match your contacts. This feature is optional when configuring 'older' connections, you'll be able to tick or untick the box. For newer ones, this is mandatory, just to make sure you're always protected from duplicates (don't we all hate them!). If you do wish to turn off this feature, just give us a shout at Don't worry, we will always advise first on how best to proceed!


The availability of these features is app and connection dependent. If the boxes are not there to tick, the features are simply not available. We need to be able to detect deletions and/or unsubscribes on one side and at the same time be able to create a tag/group/list/... named 'PieSync Trash' or 'PieSync Unsubscribes' on the other side. When available, we always explain how and in which direction this feature works for that particular connection.

Syncing Unsubscribes or Syncing Deletions is not available in all connections. 

3.5) CHOOSE YOUR MASTER APP (When conflicting change is detected)

We need you to choose the 'winning app' in case PieSync detects conflicting changes. PieSync detects changes on a field level: Chances of having a conflict are very small; only when two people are updating the same field of the same contact, in different applications at the same time, with conflicting information, there is a conflict (phew, we hope you survived that sentence as well)! On the rare occasion, when a conflict does occur, PieSync will take the value of the master application.

During the initial sync, when we match your databases based on the email address field, we will also use your Master App choice when there's a difference on another field level. Don't worry, when your master app has empty fields, we won't delete any field information in the other app.


When you have a connection setup with Google Contacts, you can additionally sync your contacts to the Google Contacts group 'My Contacts’. This feature is especially useful for iPhone users, as your iPhone contacts get synced to 'my contacts' in Google by default.

This Feature is only available in connections with Google Contacts. 


This part in the configuration shows you the default fields we currently keep in sync and how we map them between the two apps you have connected. 


This feature allows you to create custom mappings, defining which contact fields should be kept in sync between your applications, including standard and custom fields.

Want to know more about setting up custom fields in MailChimp? Find out here!

The customizable field mapping is set up and shown in the white part below the default field mapping in the configuration. You can add an unlimited amount of mappings and remove, enable/disable them anytime.


Make sure no other integrations are running next to PieSync for the accounts you have connected in PieSync. Other integrations will have access to your data and have the ability to manipulate as well. For this reason, we kindly ask you to use PieSync and nothing else to keep your data in sync. Other integrations running in parallel with PieSync are a no-go!

In case you have a lot of contacts in your applications, the initial sync will take some time, even if you configured PieSync only to sync a subset of your contacts. During the initial scan, we need to process all of your contacts (also the contacts outside the chosen subset) to avoid duplicates during the sync. After the initial sync, it should never take much longer than five minutes for updates to show.

Once your connection is active, PieSync works in the background. If you're curious, you can log in and see on the dashboard what has been syncing the last 24 hours. Here below you see an example of how this is visualized.

Thanks to the feedback we have already received, we created a list of popular apps that we’re going to work on very soon. By voting them up in our pipeline, YOU decide which connectors we’ll release first. If you don’t see your app on the list or need any further help, drop us a line - 

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