Powerful professional graphic design tool
Sketch is a powerful graphic design tool aimed mainly at professionals in web design and interactive multimedia fields.
Although Sketch is certainly easier to use than Dreamweaver, it's still not a tool that beginners to design will find very manageable.
If you're an experienced designer however, the range of features and relative ease at designing is impressive. However, there's not much support for Sketch - there is no community forum and not many instructions.