Dabuuker

Show content in a modal after page load.
Usage:
Select ‘SN Popup’ from the admin menu, then Add New. Type a name for the popup and insert any content you like. If you’re done, click Publish.
Now find a page or post you’d like to see the popup on and edit it. There should be a new metabox called ‘SN Popup’, choose the settings you want and hit Update, then view your page.
Video: https://www.youtube.com/watch?v=t6lt6v3fuEQ
To change the styling of the modal, you can override its styles in your theme’s css. Or for more advanced styling you can dequeue the default css and replace it with your own.
For reference, the default unminified version of the css is located at /plugins/sn-popup/vendor/featherlight-1.3.4/src/featherlight.css
To dequeue the old css and enqueue your own, add something like this to your functions.php:
<pre><code>add_action('wp_enqueue_scripts','remove_featherlight_css'); function remove_featherlight_css(){ wp_dequeue_style('sn-featherlight'); wp_enqueue_style('featherlight-new-css','/path-to-new-css'); } </code></pre>

Soronet Popup

Tim Eckel

Easily create responsive WYSIWYG popup modals that are displayed at a user-specified frequency and optionally printed with a single click (great for coupons!). Simple to use, yet advanced options:
<ul>
<li>Disable popup: (check to disable, uncheck to enable)</li>
<li>Frequency of popup: (Define how frequently each popup will display: every refresh, once per session, various minutes, various hours, weekly, monthly, yearly, or only once)</li>
<li>Popup expires after: (Specify the date the popup will expire, or never expire) [date picker UI]</li>
<li>Display popup on: (All pages, front page only, or interior pages only)</li>
<li>Print option: (Allow printing of the popup)</li>
<li>Popup location: (Centered, top center, bottom center)</li>
<li>Maximum width: (Define the maximum width of the popup in pixels)</li>
<li>Show title: (Allow the popup title to be visible or hidden for each popup)</li>
<li>Text color: (Select a foreground text color for each popup window) [color picker UI]</li>
<li>Background color: (Select a background color for each popup window) [color picker UI]</li>
<li>Button location (No buttons “X” to close, left, center, or right)</li>
<li>Test popup (while creating in the admin console)</li>
</ul>

Popup Modal

Easily create responsive WYSIWYG modals that popup at your desired frequency and optionally print with a single click.

Soronet Popup vs Popup Modal