The App Maker
Any App that made with HTML / JS / CSS that can work on your local device can be used as a stand alone App for Android & iOS. Just upload your project files under a zip file and hit the Make App button, the App Maker will add your files to a WebView App with all the Extra Features.
You can use the Extra Features section of our App Maker in order to set the Icon, the Ownership and the look and the behavior of your App.
The App Maker supports the Firebase SDK by default, you can easily add your JSON / PLIST settings then use the Messaging (Push Notifications) and the Analytics services of Firebase from your App.
You can convert your HTML / JS / CSS project file into a mobile App for Android for Free and test the results, upgrading to a dedicated App can be done at any time in the future.