So I did a fully functinal HTML5 offline app demo.
This demo contains the functionality as the Windows Phone app,… plus a DropBox Backup/Sync and a WhatsApp export feature.
All data will be stored only localy in the browsers local storage.
It was tested on IPhone (5), Android (4.4) and Windows Phone (8.1) and can be added to the “home screen” on these platforms.
Here you will find the HTML5 Version: List it web app