Matthew Poer

I wrote this plug-in mostly as an attempt to learn more about creating WordPress Plug-ins, but I think it is potentially useful for certain folks and so I am releasing it as an open-source, unsupported piece of software. I hope you enjoy it.
The goal of the plug-in is to help a WordPress Site Administrator integrate a MailChimp mailing list into the WordPress site. Once the plug-in is installed, you must provide a MailChimp.com APIKey, then select a list to enroll your visitors to.
The default widget is practical, but not very pretty. Basically, it includes a typical widget layout containing three input fields, one hidden field to track the page URL, and a submit button. The HTML for the widget can be customized to fit your site and WordPress theme. If you choose to do this, please don’t try to change the input fields’ NAME or ID attributes. It won’t work if you change these.

MailChimp Newsletter Widget

The goal of the plug-in is to help a WordPress Site Administrator integrate a MailChimp mailing list into the WordPress site.

Danny van Kooten

ibericode

Harish Chouhan

This plugin shows your Mailchimp lists activity, right in your WordPress dashboard.
<h4>Mailchimp lists activity</h4>
Once activated, it will show a new dashboard widget containing a bar-graph or line-graph (<a href="https://wordpress.org/plugins/mc4wp-activity/screenshots/">screenshots</a>) showing day-to-day changes to your Mailchimp lists. You can choose to view relative activity (daily subscribes vs. unsubscribes) or a line graph visualizing your total list sizes.
Requirements
This plugin has the following requirements.
<ul>
<li>The <a href="https://wordpress.org/plugins/mailchimp-for-wp/">Mailchimp for WordPress</a> plugin (3.0 or higher).</li>
<li>PHP 5.3 or higher.</li>
</ul>
To get started with the plugin, please have a look at the <a href="https://wordpress.org/plugins/mc4wp-activity/installation/">installation guide</a>.

MC4WP: Mailchimp Activity

Disclaimer: I'm the plugin author.
We've been using this plugin internally for quite a few months now to show MailChimp list sizes right in our WordPress dashboard so we didn't have to log into our MailChimp account every now and then to monitor list related activity. 
So yes, we use it on a daily basis and love it. Now we decided to share it with you, for free. :)



Handy for a quick overview of MailChimp list activity.

Very handy executive summary of your Mailchimp list anayltics right in the dashboard. Thanks!



Featured on iThemes Training Plugin Roundup, March 2016

Shows activity for your Mailchimp lists, right in your WordPress dashboard.

MailChimp Newsletter Widget vs MC4WP: Mailchimp Activity