pajko

This plugin will enable you to add any kind of slide in/out popups to your WordPress website. 
New widget, called “SlideIn Box”, is added. Each of these widgets can hold one slidein box content, whitch can be any HTML or PHP code. Inside these widgets you will have complete control over your slidein box layout. 
New widgets sidebar, called “SlideIn Boxes”, is added, where you should place all defined “SlideIn Box” widgets. After that, they will be selectable from the dropdown menu on Global SlideIn Options page, and inside page/post meta boxes.
<ul>
<li>You can control the position for each SlideIn box. </li>
<li>You can control when will these SlideIn boxes display to your visitors.</li>
<li>You can specify delay for each SlideIn box.</li>
<li>With little HTML/CSS knowleadge you can have your own styles for toggle and close buttons. </li>
<li>Page/post settings will override global settings for SlideIn boxes.</li>
</ul>

Slide In Popup

Define the bottom edge slide-in box with any HTML/PHP globally or for each WP page/post.

Damian

WP Popups is the best popup maker for WordPress. With the easy and intuitive template builder you will be able to create and customize your popup with just a few clicks. No coding skills needed!
Is the perfect solution to show important messages such as EU Cookie notice, increase your social followers, add call to actions, increase your mailing lists by adding a form like mailchimp or to display any other important message in a simple popup.
<iframe loading="lazy" title="How to create a popup in WordPress" width="750" height="422" src="https://www.youtube.com/embed/_yJ-xHVOQYw?feature=oembed" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" referrerpolicy="strict-origin-when-cross-origin" allowfullscreen></iframe>
It’s compatible with the major form plugins like : 
* Wp Forms ( recommended ) 
* Gravity Forms 
* Ninja Forms 
* Contact form 7 
* USP Forms 
* Infusion Soft 
* Jetpack 
* Mailpoet 
* Mailchimp for WP 
* Postmatic 
* Any generic form
There are multiple display filters that can be combined:
<ul>
<li>Show popup on specific pages, templates, posts, etc</li>
<li>Filter user from search engines</li>
<li>Filter users that never commented</li>
<li>Filter users that arrived via another page on your site</li>
<li>Filter users via roles</li>
<li>Show popup depending on referrer</li>
<li>Show popup to logged / non logged users</li>
<li>Show or not to mobile, desktop and tablet users</li>
<li>Show or not to bots / crawlers like Google</li>
<li>Show or not depending on query strings EG: utm_source=email</li>
<li>Show depending on post type, post template, post name, post format, post status and post taxonomy</li>
<li>Show depending on page template, if page is parent, page name, page type</li>
</ul>
<h4>Available Settings</h4>
<ul>
<li>Choose from 5 different popup locations</li>
<li>Trigger popup after X seconds , after scrolling % of page, after scrolling X pixels</li>
<li>Auto hide the popup if the user scroll up</li>
<li>Change font color, background, borders, etc</li>
<li>You can also configure background opacity.</li>
<li>Days until popup shows again</li>
<li>Shortcodes for social networks available</li>
</ul>
<blockquote>
Premium Version
Check the new premium version available in (<a href="https://wppopups.com?utm_source=readme%20file&utm_medium=readme%20links&utm_campaign=Popups%20Premium" rel="nofollow ugc">https://wppopups.com</a>)
<ul>
<li>Beautiful optin forms for popular mail providers</li>
<li>Exit Intent technology</li>
<li>AJAX login popups</li>
<li>Popup scheduler</li>
<li>Popups Geolocation</li>
<li>Currently supporting MailChimp, Aweber, Postmatic, Mailpoet, Constant Contact, Newsletter plugin, Activecampaign, InfusionSoft, etc</li>
<li>New popup positions: top/bottoms bars , fullscreen mode, after post content</li>
<li>A/B testing. Explore which popup perform better for you</li>
<li>More Display Rules: Show after N(numbers) of pages viewed</li>
<li>More Display Rules: Show popup at certain time / day or date</li>
<li>More Display Rules: Show/hide if another popup already converted</li>
<li>Track impressions and Conversions of social networks and forms like CF7 or Gravity forms</li>
<li>Track impressions and Conversions in Google Analytics ande define custom events</li>
<li>Data sampling for heavy traffic sites</li>
<li>Background images</li>
<li>40 New animations effects</li>
<li>More trigger methods</li>
<li>Timer for auto closing</li>
<li>Ability to disable close button</li>
<li>Ability to disable Advanced close methods like esc or clicking outside of the popup</li>
<li>Premium support</li>
</ul>
</blockquote>
WP Popups template builder it’s based on the famous <a href="https://wordpress.org/plugins/wpforms-lite/" rel="ugc">WPForms plugin</a>, the best form plugin for WordPress!

WP Popups – WordPress Popup builder

Popup didn't close after conversion (mailchimp form). None of the tooltips showed - just blank box. Needs a little more tweaking.

Some features didn't work

WP Popups is the best popup maker for WordPress. Easy but powerful plugin with display filters, scroll-triggered popups, and Gutenberg block editor.

Slide In Popup vs WP Popups – WordPress Popup builder