Give Visitors a Strong Reason to Leave Their Emails on Your Website Opt-In Panda locks a portion of content on a webpage, by hiding or blurring it, and asks the visitor to enter his email address (opt-in) to unlock your content. In other words, it gives visitors a reason to subscribe right now in return to instant access to your valuable content (e.g. downloads, discounts, videos and so on).
Demo: https://codecanyon.net/item/optin-panda-for-wordpress/10224279