These are Cordova resources. You can replace icon.png and splash.png and run `ionic cordova resources` to generate custom icons and splash screens for your app. See `ionic cordova resources --help` for details. Cordova reference documentation: - Icons: https://cordova.apache.org/docs/en/latest/config_ref/images.html - Splash Screens: https://cordova.apache.org/docs/en/latest/reference/cordova-plugin-splashscreen/