Ugh. Really, you guys think this is the future? It's a total perversion of what a URL and a webpage are supposed to be. It's ugly hacks on top of more ugly hacks to produce a substandard experience.
An app like this is not hard to produce with Xcode and Obj-C, and it will look feel and work 10x better. It will only get easier as development tools improve, and Xcode and Interface Builder have a ways to go to catch up with Visual Studio.
There is a place for web apps and a place for real apps. For many years now countless companies have been investing in shoehorning an app into a webpage, and they don't have much to show for it except buggy javascript and unreliable software. Not even semi-professionals would consider using Google Docs over client-based Word for serious document composition. Or substituting Photoshop with one of the dozens of webapp photo editing tools. It's all cute, but in the end its not practical for real world use.
It's unfortunate that so many talented programmers are sucked into this "webapp everything" mindset and devote themselves to crappy products, sometimes simply because they have a personal hangup with Microsoft or Apple. Obviously there are plenty of skilled coders who are making client-based software that's beautiful, useful, and profitable, but client software is still dominated by crap, even on super popular platforms like iOS and especially Android. There are enormous opportunities on the client that have been ignored for a decade.
Think about this, today for less than $200 you can have a more powerful computer (more RAM, more storage, more MHz) in your pocket than you could buy for $1000 in 2000. And today's has a phone, a camera, broadband internet, GPS all built in. Not only that, but that same computer is making its way into your TV and car. And what is being done with all that power? Still hacking choppy javascript animations on a document markup language!