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What is Project Siena?

Microsoft Project Siena (code name) is an app that enables you to build other apps! Place some visuals on a canvas, hook them up to your data, then customize how your app looks and works. Write Excel-like expressions to power your app with special logic and intelligence. No programming required. You can build a truly modern app using all the capabilities of mobile devices, including touch, pen input, hand writing recognition, camera, voice annotation and more.

Siena apps are simply HTML/JavaScript with no private runtime. Apps built with Siena are deployed and managed like any other apps. Apps can even be opened in Visual Studio and extended.

With Siena you can build the exact app you need for your mobile business process without compromise. Here are some examples of the kinds of apps people are building today:

  • Consume information, like product catalogs and video lesson plans
  • Make on-the-spot decisions, like adjusting insurance claims or accessorizing outfits
  • Capture pictures, audio, handwriting and other real world inputs

For more information visit the Microsoft Project Siena website.

The ‘Dump your Brain’ application I created has been made with Project Siena.


Frederik De Breuck is better known as Stonyarc (GamerTag). Next to writing and maintaining his personal blog he is the owner of and . He's also Microsoft MVP (Most Valuable Professional) since 2010 and works as Presales Director for Fujitsu Belgium.

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