wp.insider

smp7

This addon allows you to specify a MailChimp list name for each of your access levels. When members join your site, they get signed up to the specified MailChimp list.
This addon requires the <a href="https://wordpress.org/plugins/simple-membership/" rel="ugc">simple membership plugin</a>.
After you install this addon, edit your membership level and specify the mailchimp list name. Then go to the MailChimp settings interface and specify your API Key.
Read the following page for step by step usage documentation: 
https://simple-membership-plugin.com/signup-members-mailchimp-list/

Simple Membership MailChimp Integration

An addon for the simple membership plugin to signup members to your MailChimp list

wpsolutions

The Contact Form 7 AutoResponder Addon plugin allows you to automatically add people to your MailChimp list after they’ve submitted one of your Contact Form 7 forms.
The plugin will read any type of configured fields which are submitted from your CF7 form and insert the information in the relevant Mailchimp list.
For more information on how to configure and use this plugin please <a href="https://wpsolutions-hq.com/contact-form-7-mailchimp-addon-plugin" rel="nofollow ugc">see this</a> page.

CF7 AutoResponder Addon

Allows automatic subscription of people to your MailChimp list after they've submitted a CF7 form. > GDPR-compliance: This plugin works in ta …

Simple Membership MailChimp Integration vs CF7 AutoResponder Addon