We've been working hard behind the scenes to create an AppDesigner Client for Windows 8. Our first beta is now ready for download.
Windows 8 AppDesigner can make apps for both Windows 8 and Windows Phone.
This beta can be used to prototype your apps. If you design an app you'd like to submit for building, contact us through support and we'll send you upload information.
Download AppDesigner Beta for Windows, and try it out ...