This video shows how to create a mobile tip calculator app in Appery.io and instantly publish it as HTML5 mobile app.
The app is based on this Tutorial at Smashing Magazine.
Appery.io (http://appery.io) is a cloud platform for creating and running mobile apps. Appery.io provides a visual UI builder, and integrated backend services. Backend services include: database, push notifications, server code, and app hosting. Apache Cordova is bundled to provide access to native device features. The app can be packaged for Android, iOS, Windows Phone, or hosted as mobile web app.