Pro membership also unlocks complete access to SketchBook on Windows desktop, Mac, Android, and iOS, including all upgrades as long as your membership is active.Pro membership: Other workflow improvements, including new ruler guides, flood fill, and much more.Pro membership: Full layer controls, including rich layer blending modes makes image manipulation easier than ever.Pro membership: Choose from a comprehensive brush library with pencils, pens, markers, and brushes, including new Synthetic and Smudge brushes.Sign in with a free SketchBook account and unlock the Layer Editor, Symmetry Tools, and more.Choose from over 10 preset brushes, including pencils, pens, and markers that deliver a natural drawing experience.Control the finest details of your art with up to a 2500% zoom.Open and Save layered PSD and TIFF files for easy interoperability with other applications, including SketchBook for desktop.The entire screen is your canvas with a full screen workspace and unobtrusive user interface.Designed specifically for both pen and touch input on Windows tablets.Here's the product description from Windows Store:

Autodesk sketchbook surface pro