Harmony is a sketching and drawing tool for designers based on HTML5. Its developer, Mr. Doob, first came up with the ideal on March 8th, 2010, It was upgraded to Rev6, which is the version we are using now.
Harmony offers 11 special sketching effects: sketch, shaded, chrome, fur, longfur, web, simple, squares, ribbon, circle and grid. It has a user-friendly interface and it is easy to operate. <d> and <f> are used to increase/decrease brush size. Reset brush with <r>. By choosing colors from the color wheel, designers are free to set both foreground and background colors.
Drawing gets saved on the browser so it can be continued later.
Increase brush size for high DPI (dots per inch) devices ( Android / iPhone OS)
Confirmation box pops up before clearing
Wacom pressure support
Optimized color palette code