Add new Builder.io form leads to a Mailchimp audience

Every form submission on your Builder.io site goes to Mailchimp, where the visitor is added to the audience you choose, or their details are updated if they are already a member.

Builder.io

Mailchimp

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2 steps Setup ~5 min Used on 3.2k sites Free to import

What this workflow does

Builder.io lets you build landing pages and sign-up forms fast, but the leads they collect still have to reach your email list. Exporting them by hand means delays and missed contacts. This workflow sends each lead to Mailchimp the moment the form is sent.

FlowMattic's Builder.io trigger starts a run for every new form entry on your site. FlowMattic passes the submitted answers to Mailchimp, where Add New Member puts the person on the audience you select. If the address is already on that audience, Mailchimp updates the member instead of adding a second copy.

The workflow has two steps and no conditions, so every submission reaches Mailchimp. That includes test entries and spam, unless you add a Filter. Task History shows what was sent for each lead and Mailchimp's response.

Landing page for a product launch

A Builder.io launch page collects early-interest emails, and each one joins the Mailchimp audience you will send the launch announcement to.

Gated download on a marketing site

Visitors fill in a Builder.io form to get a guide, and their details land in Mailchimp ready for your welcome sequence.

Waitlist for a new service

A simple waitlist form built in Builder.io feeds a Mailchimp audience, so you can email everyone at once when spots open.

How this workflow runs

What happens at each step once the workflow is on, and what you need before you import it.

Step 1Trigger
Builder.io New Form Submission
Runs each time a visitor submits a form on your Builder.io site. The answers in that submission become data you can map into Mailchimp.
Step 2Action
Mailchimp Add New Member
Adds the person to your chosen Mailchimp audience, or updates them if the address is already there. Connect your Mailchimp account and map the form's email answer, plus any name answers you collect.

What you need

FlowMatticCore
Builder.io AccountAccount
Mailchimp AccountAccount

After importing, map your own data. To keep the template universal, not every step is pre-filled. Open each step in the builder and connect your accounts and fields (channels, lists, sheets, recipients) before you switch the workflow on.

Make it yours

Changes worth making after you import it.

Add a Filter after the trigger that continues only when the email answer is not empty, so Mailchimp never gets a submission without an address.
If your Builder.io site has several forms and the test data shows which form sent the entry, add a Filter on that value so only your sign-up form feeds this audience.
Submit the Builder.io form once after import so FlowMattic captures its fields, then do the Mailchimp mapping from that sample.

Questions about this workflow

What happens if the Builder.io lead is already on my Mailchimp audience?

Mailchimp refreshes that person's details on the audience rather than listing them twice. The run still completes, and Task History shows Mailchimp's reply.

Are Builder.io leads from before the import sent to Mailchimp?

No. The trigger reacts to new submissions only, so earlier leads stay where they are. You can import those into Mailchimp yourself.

Which Builder.io form answers can I send to Mailchimp?

Any answer the submission carries. After a test submission, those answers show up for mapping in the Mailchimp step.

Does the workflow send an email to the new Mailchimp member?

Not by itself. The step stops at putting the lead on the audience. Any welcome email depends on what you set up in Mailchimp.