Are there any standard UI / UX / design principles or guidelines for building Ubuntu apps?

Question

Are there any standard UI / UX / design principles or guidelines for building Ubuntu apps?

I'm creating my first app and am afraid it will be too "webappish".

Answer 1

Desktop

In general following the GNOME Human Interface Guidelines should be fine.

Depending on your apps you may have a look at this ones, too:

• Custom Status Menu Design Guidelines
• Notification Development Guidelines

Answer 2

Mobile

There are now :)

All Ubuntu apps designed to run on mobile devices should follow the App Design Guides