They’re two different APIs. One is called “Open In…”. The other is “PhotoAppLink”. They’re both great hooks in photo apps that lets you bypass saving images to the camera roll and open the image directly in another app.
Both services get your image directly from one photo app to the next, bypassing the camera roll. When switching apps the user must save the edited image to the camera roll, quit the current app, launch the next and then load up the intermediate image before continuing to edit it. Not only does this cause version bloat in your camera roll, but repeated saving of a JPG can possibly add unwanted noise and artifacts to the image depending on the level of JPEG compression.
App Booster is a software development kit (SDK) aimed at helping developers and publishers keep their users active and engaged within the app. It lets developers integrate a 2-way inbox, making it look like a native feature of the app and allows the developer to broadcast in-app notifications, in what Ohayon calls a “non-intrusive way”.