Ionic View is an app viewer that you can download from the App Store or Google Play. When you are in the development process and the app is not complete, you don't want to submit it to either Apple or Google right away but limit access to your testers. Ionic View can help load your own app inside Ionic View and make it behave like a real app with some access to native device features. Additionally, Ionic View lets you use your app on an iOS device without any certification requirements.
Since Ionic View uses the Cordova InAppBrowser plugin to launch your app, all the device features have to be hacked to make it work. Currently, Ionic View only supports SQLite, battery, camera, device motion, device orientation, dialog/notification, geolocation, globalization, network information, vibration, keyboard, status bar, barcode scanner, and zip. It's a good idea to check the updated support list prior to using Ionic View to ensure that your app works properly.