Casper is a free social networking app that lets you save images from other users without their knowledge and that allows you to forward stories among users. It includes a full set of stickers and filters that can be applied to give images a more polished look. Casper is an alternative client to Snapchat and requires authentication via Snapchat and Google logins. Users will need to have accounts in both of those services to be able to use Casper. This app is optimized for Android 5.0, also known as Lollipop, but will work with any Android version 4.1 or higher.