PlugMatter Feature Box is a powerful plugin for creating feature boxes - those optin boxes you see on sites like Social Triggers or Smart Passive Income that get email addresses right from the start, using the most powerful location on your website.
It has lots of features to help you create a stunning feature box, with templates and a wysiwyg editors for easy, non-tech creation.
They also have split (A/B) testing to help optimize your conversions too.
LeadPages is great for anyone looking to seriously build their email list or make sales.
It was built as a high converting Landing Page builder and has evolved into a powerful and easy to use tool for getting leads, emails, sales and more.
You can build pages, optin forms, get leads via SMS and more. And it all integrates easily with WordPress via a simple plugin installation.
Although not the cheapest tool on the block, it is very well built and great for pros and businesses.
A feature-rich popup builder that also comes with some extras to make it worth your while.
All the popup and optin forms you would expect (top/bottom of site, bottom of post, slide in and more).
Various triggers (scroll, exit intent, click on link) and filtered content (only the optins you want on any given page).
This is one of the top list building plugins you should be considering.
Sumo Me is a great place to start if you want to add list building functionality to your website for free.
They provide basic popups, scroll boxes, header bars and some other options. But the really stunning options you have to pay for.
It also comes with a great Image Sharer, which is worth trying on it's own for it's image focused social sharing capabilities.
Another great list building plugin with all the features you need.
All the optin form types you could imagine, A/B Testing to optimize, Exit Intent popups and categorized optins (show only where you want) and even location based content.
They also provide various levels of pricing so you can buy the features you need.
Thrive Leads is one of the most comprehensive list building plugins for WordPress.
It gives you the ability to add optin forms almost anywhere on your website (sidebar, footer of posts, header ribbon, popups, links etc) and all using an amazingly easy editor. That means "no tech skills required".
They also give you built-in A/B testing so you can fine-tune your optins and get even more stunning results.