Letting users customize the app icon to generate delight and drive viral acquisition

On Zenly, you can unlock customized app icons by doing actions that make you a power user (inviting friends, using the app everyday, etc.). It's a good technique to hook your users into your product and to create viral free marketing when users brag about their customized icon.

On Photoroom, you can unlock customized app icons by becoming a pro user or by sharing on social media a demo of the app.