Sketch Swap is described as 'Draw 1 to get 1. . Draw cartoons, art, brainstorms, anything' and is a Digital Painting Tool in the category. There are four alternatives to Sketch Swap, not only websites but also apps for Windows, Android and Mac. The best alternative is QueekyPaint, which is free. Other great sites and apps similar to Sketch Swap are Sketch Toy (Free), Draw Together by KW10 (Free) and Drawisland (Free).
QueekyPaint is a unique browser-based drawing tool for creating animated drawings online. Visit the massive gallerys and learn drawing by watching the process of your favourite artists. QueekyPaint is free and simple to use.