YOOmustADD Favorite Add-on provides a favorite system for your YOOtheme website. All you need to do is install the plugin through WordPress plugin manager.
YOOtheme Element
The add-on also provides a ready-to-use element which allows the developer to add grids with favorite button so users can easily mark as favorites any post/link/page or even custom post types.
Easy to customize
You can choose your icon and adjust color for any status (Default, hover, active)
Also you can adjust the position of the element
and many more.
Notes
The plugin works perfectly with dynamic content. But you can also add some custom grids on your website which can allow the user to favorite.
There is also the option to show only favorited items
IMPORTANT: The user must be logged in to store the favorite page/post/custom type and each grid item needs to have a link.