Mailchimp

Use the Mailchimp List Subscribe plugin to quickly add a Mailchimp signup form block, widget, or shortcode to your WordPress site.
After installation, if you already have a Mailchimp account, you’ll log in with that account and then proceed to configure settings.
If you don’t have an account, you can create one directly in the plugin. After entering in all your personal details, you’ll need to activate your account via an email that will be sent to you. Once done, you’ll proceed to configure settings.
On the settings screen, you’ll select your Mailchimp list, choose merge fields and groups, and configure other options. Once done, you can now add the block, widget, or shortcode (<code>[mailchimpsf_form]</code>) to your site. Typically, installation and setup will take about 5-10 minutes, and absolutely everything can be done via the WordPress Setting GUI, with no file editing at all.
WordPress.com compatibility is limited to Business tier users only. <a href="https://mailchimp.com/help/ways-to-add-a-signup-form-in-wordpress/" rel="nofollow ugc">How to add a signup form if you have a WordPress.com site</a>.
<h3>Access Token Encryption</h3>
Starting in version 1.6.0, authentication has changed to use OAuth. As part of this process, we retrieve an access token that can be used to make API requests. To provide a high-level of security, this access token is encrypted before being stored in the WordPress database. In order to ensure this access token can be decrypted when used, the plugin relies on certain security constants that should remain unchanged.
With no additional configuration, we use the standard <code>LOGGED_IN_KEY</code> and <code>LOGGED_IN_SALT</code> constants that are normally set in your site’s <code>wp-config.php</code> file. Some sites make use of security plugins that rotate these constants on a periodic basis. When this happens, we won’t be able to decrypt the access token and you’ll need to reconnect your Mailchimp account to generate a new access token.
To prevent such issues, it is recommended to define two additional constants in your site’s <code>wp-config.php</code> file: <code>MAILCHIMP_SF_ENCRYPTION_KEY</code> and <code>MAILCHIMP_SF_ENCRYPTION_SALT</code>. These constants should consist of a combination of characters, preferably at least 32 characters long. Once set, these values should not be changed. For strong values, you can copy some of the values from <a href="https://api.wordpress.org/secret-key/1.1/salt/" rel="nofollow ugc">here</a> and use them. You’ll end up with additional code like the following in your <code>wp-config.php</code> file:
<pre><code>define( 'MAILCHIMP_SF_ENCRYPTION_KEY', 'put your unique phrase here' );
define( 'MAILCHIMP_SF_ENCRYPTION_SALT', 'put your unique phrase here' );
</code></pre>
If these constants are added after you’ve already authenticated with Mailchimp, you will need to reconnect your account. To avoid this, you can copy the values from <code>LOGGED_IN_KEY</code> and <code>LOGGED_IN_SALT</code> (if they exist) to <code>MAILCHIMP_SF_ENCRYPTION_KEY</code> and <code>MAILCHIMP_SF_ENCRYPTION_SALT</code> respectively.
<h3>Upgrading</h3>
If you are upgrading to version 1.2.1 and you used the widget in your sidebar previously, all you need to do is drag the <code>Mailchimp Widget</code> back into the sidebar, visit the Mailchimp settings page (which will have maintained your prior settings), click the “Update List” button, and you’re done!

Mailchimp List Subscribe Form

Add a Mailchimp signup form block, widget, or shortcode to your WordPress site.

Fetch Designs

This plugin lets you quickly and easily set up sign-up sheets on your WordPress site. Use it for volunteer and time slot sign-ups, personnel and resource coordination, and much more.
The free version of Sign-Up Sheets includes the following features:
<ul>
<li>Administrator can add, edit and clear sign-up spots as needed – add/edit is NEW as of version 2.2.9</li>
<li>Copy a sheet or a task to a new one</li>
<li>Confirmation emails on sign-up</li>
<li>Allow logged-in users to see all the tasks they’ve signed up for on one page using the <a href="https://www.fetchdesigns.com/doc/user_sign_ups-shortcode/" rel="nofollow ugc"><code>[user_sign_ups]</code> shortcode</a>.</li>
<li>No limit on the number of sign-up sheets and sign-up spots</li>
<li>reCAPTCHA (optional) – NEW as of version 2.2</li>
<li>Export sign-up information for a single sheet or all sheets to a CSV</li>
<li>Supports WordPress <a href="//www.fetchdesigns.com/doc/gdpr-sign-up-sheets-wordpress-plugin/)" rel="nofollow ugc">GDPR privacy features for your sign-up sheets</a></li>
<li>Developed with accessibility in mind based on <a href="https://www.w3.org/WAI/standards-guidelines/" rel="nofollow ugc">WCAG Guidelines</a>. If you run into any accessibility issues, <a href="https://www.fetchdesigns.com/contact" rel="nofollow ugc">please report them</a> to help make the plugin more inclusive for all users.</li>
<li>And much more… <a href="https://www.fetchdesigns.com/sign-up-sheets-wordpress-plugin/" rel="nofollow ugc">full list of Sign-up Sheets features</a></li>
</ul>
The Pro version of Sign-Up Sheets includes the following features:
<ul>
<li>Ability to create <a href="https://www.fetchdesigns.com/doc/custom-fields/" rel="nofollow ugc">Custom Task fields and Custom Sign-up form fields</a></li>
<li>Automatically sends reminder emails before an event (optional)</li>
<li>Allows customization of the confirmation and reminder emails per sheet</li>
<li>Assign <a href="https://www.fetchdesigns.com/doc/sheet-categories/" rel="nofollow ugc">categories to sign-up sheets</a> and display a list of current sheets for a specific category.</li>
<li>Logged-in user can edit their own sign-ups</li>
<li>Spot Locking – Locks and holds a spot for 3 minutes when a user accesses the sign-up form (optional)</li>
<li><a href="https://www.fetchdesigns.com/doc/compact-semi-compact-standard-display-modes/" rel="nofollow ugc">Compact and Semi-Compact display modes</a> to condense tasks with a large number of spots into a single line (optional)</li>
<li>Enable sign-up limits per task</li>
<li>And much more… <a href="https://www.fetchdesigns.com/sign-up-sheets-wordpress-plugin/" rel="nofollow ugc">full list of Sign-up Sheets features</a></li>
</ul>
Sign-up Sheets is currently being used by organizations and businesses for non-profit and church volunteer opportunities, schools and PTO/PTA volunteering, club sign-ups, photographer and meeting room timeslot sign-ups, and more. It’s a great alternative to monthly paid services like SignUpGenius and allows you to control your own sign-ups right on your WordPress site.

Sign-up Sheets

An online sign-up sheet manager where your users can sign up for tasks.

Mailchimp List Subscribe Form vs Sign-up Sheets