Shopify Forms

Great app for getting a clean nice looking popup on your website. The linking to discounts is really intuitive and easy. Plus it allows more customization than ones that come within themes.
The biggest complaint is probably a bug. If you set up a popup as an exit popup it doesn't work. It just pops up after the timer and doesn't actually come up when the user tries to exit. THIS NEEDS TO BE FIXED.
Because of that your better off using the theme popup or getting a different app.