"PopupAlly allows you to create advanced popup signup forms in under 5 minutes without the need to deal with messy code.
If you're looking to grow your list, then PopupAlly is the no-fluff free WordPress popup plugin for you. With built-in advanced features this lightbox popup plugin allows you to build your list as people are about to exit your website. Exit-intent popups allow you to capture lost visitors and have been shown to increase conversion by over 300%. PopupAlly allows you to create advanced popup signup forms in under 5 minutes, even if you don't know code. PopupAlly's visual editor allows you to customize the look-and-feel of your popups with an instant preview, saving you lots of time."