DannyCooper

Capture is a powerful WordPress plugin designed to help you build your email list with ease. Whether you’re connecting to external Email Marketing Services (EMS) or storing subscribers locally, Capture provides a seamless solution for collecting and managing email subscriptions.
Key Features:
<ul>
<li>Dual Storage Options: Connect to your favorite Email Marketing Service or store subscribers locally in your WordPress database</li>
<li>Block Editor Support: Native WordPress block for easy form creation and customization</li>
<li>Local Subscriber Management: Built-in admin interface to view, search, and manage subscribers</li>
<li>CSV Export: Export your subscriber list for use in other tools</li>
<li>Privacy Compliant: GDPR-ready with data retention settings and unsubscribe functionality</li>
<li>Customizable Forms: Flexible form styling and layout options</li>
<li>Admin Notifications: Optional email notifications for new subscribers</li>
<li>Search & Filtering: Advanced admin tools to find and manage specific subscribers</li>
</ul>
Supported EMS Providers:
<ul>
<li>Mailerlite</li>
<li>Mailchimp</li>
<li>Kit (previously known as ConvertKit)</li>
</ul>
Perfect For:
<ul>
<li>Bloggers and content creators</li>
<li>Small businesses building email lists</li>
<li>Developers needing a flexible subscription solution</li>
<li>Anyone wanting control over their subscriber data</li>
</ul>
How It Works:
<ol>
<li>With EMS Connected: Subscribers are automatically sent to your configured email marketing service</li>
<li>Without EMS: Subscribers are stored securely in your WordPress database with full admin management tools</li>
<li>Always Functional: Forms work regardless of your EMS connection status</li>
</ol>
<h3>External services</h3>
This plugin connects to third-party Email Marketing Service (EMS) APIs to synchronize subscriber data when an EMS integration is configured. The plugin only connects to these services when users explicitly configure their API credentials in the plugin settings.
When an EMS connection is configured, the plugin sends subscriber information (email address and optional first name) to the selected email marketing service each time a user submits a subscription form.
Supported External Services:
<ul>
<li>
ConvertKit (Kit): https://api.convertkit.com/v3/
<ul>
<li>Used for: Validating API credentials, retrieving available forms/lists, and subscribing users</li>
<li>Data sent: Email address, first name (optional), custom fields, and tags</li>
<li>Privacy policy: https://convertkit.com/privacy</li>
<li>Terms of service: https://convertkit.com/terms</li>
</ul>
</li>
<li>
Mailchimp: https://{dc}.api.mailchimp.com/3.0/
<ul>
<li>Used for: Validating API credentials, retrieving available lists, and subscribing users</li>
<li>Data sent: Email address and first name (optional)</li>
<li>Privacy policy: https://www.intuit.com/privacy/statement/</li>
<li>Terms of service: https://www.intuit.com/legal/</li>
</ul>
</li>
<li>
MailerLite: https://connect.mailerlite.com/api
<ul>
<li>Used for: Validating API credentials, retrieving available groups/lists, and subscribing users</li>
<li>Data sent: Email address and first name (optional)</li>
<li>Privacy policy: https://www.mailerlite.com/legal/privacy-policy</li>
<li>Terms of service: https://www.mailerlite.com/legal/terms-of-use</li>
</ul>
</li>
</ul>
Important Notes:
<ul>
<li>No data is sent to external services unless users explicitly configure an EMS connection</li>
<li>When no EMS is configured, all subscriber data remains stored locally in your WordPress database</li>
<li>Users can disable EMS integration at any time, reverting to local-only storage</li>
<li>The plugin respects user privacy and only transmits data necessary for email marketing functionality</li>
</ul>
<h3>Developer Notes</h3>
Hooks & Filters:
The plugin provides various hooks and filters for developers to extend functionality:
<ul>
<li><code>capture_before_subscribe</code> – Action fired before processing subscription</li>
<li><code>capture_after_subscribe</code> – Action fired after successful subscription</li>
<li><code>capture_form_fields</code> – Filter to modify form fields</li>
<li><code>capture_success_message</code> – Filter to customize success messages</li>
</ul>
Database:
The plugin creates a <code>capture_subscribers</code> table to store local subscriptions with proper indexing for performance.
Source Code:
To view the unminified source code, visit the <a href="https://github.com/dannycooper/capture" rel="nofollow ugc">GitHub repository</a>.

Capture

A WordPress plugin for capturing email subscriptions with EMS integration and local storage options.

sendmachine

Sendmachine’s official plugin will enable you to:
Set up signup forms 
You can set up a signup form in a few easy steps: connect using the provided API <a href="https://www.sendmachine.com/admin/#/myaccount/smtp_settings" rel="nofollow ugc">credentials</a>, select a contact list where your visitors will subscribe and you’re basically good to go. The signup form is available as a widget (in your widget area) or as a shortlink by pasting <code>[sm_subscribe_form]</code> in a post or page.
Add subscribe checkboxes 
Allow users to subscribe to your contact list only by checking a checkbox in certain website areas like comment form or register form.
Sync your wordpress users with a specific contact list 
You want to send emails to all your users but don’t know how? Well, don’t worry, we can help you with that. After you’ve successfully selected a contact list, you can use the “Sync users” button, to subscribe all your users to that contact list.
Send emails through our services 
No need for nasty, geeky configurations. Just set a from email, an optional from name and you are good to go. Also, make sure that “enable email sending” is set to <code>on</code>. 
If you set a from email that doesn’t already exist in your sendmachine account as a sender address, a confirmation email will be generated and sent to that address. 
Not quite sure if you’ve done everything right? You can test if everything is ok by sending a test email. If you got the mail, you can sit back and relax: you’ve done it, otherwise something went wrong.
Send transactional emails 
No more “dog ate my email” excuses. Using our services you can now monitor an email’s activity (opens, clicks, geolocations, user agents). In order to enable this option, after you install our plugin, go to “email settings” tab and check that “Register” and/or “Comment” checkboxes. Basically, if you tick that checkboxes on each email sent, that coresponds with that action, we add a custom tracking header: <code>X-Sendmachine-Campaign: campaign_name</code>, where campaign_name is the name of the transactional campaign that will be created, or updated if already exists. Campaign’s name can be found/modified next to every action’s checkbox.
Send news feed 
You can send a newsletter directly from the admin panel with the latest posts. You can choose to build your newsletter with the latest 5, 10, 15 or 20 posts, set newsletter’s width, color and content.

Sendmachine for WordPress

Official Sendmachine plugin featuring subscribe forms, users sync, news feed, email sending and transactional campaigns.

Capture vs Sendmachine for WordPress