Thrive Leads is among the most feature-rich email optin solutions out there. Unlike the other players on this list, Thrive Leads is a WordPress plugin, and lets you work with your forms within a familiar WordPress interface.
Thrive Leads offers loads of optin form types, and allows you to customize everything to your liking. There are countless templates available, and you don’t need any design or development skills to work with them. On top of that, you get great tracking and analytics.
Multiple types of optin forms available (pop-ups, slide-ins, floating bars, widget forms, in-content forms).
Drag-and-drop form editor.
Fully editable form designs.
Every form is mobile friendly.
Display rules – set the exact pages where the forms are going to appear, or block them on other pages.
Stats and analytics.