TriangleDraw is described as 'Primary features:' and is an app in the Photos & Graphics category. There are five alternatives to TriangleDraw for a variety of platforms, including iPad, Steam, Google App Engine, Mac and Windows. The best alternative is Isometric. It's not free, so if you're looking for a free alternative, you could try Grid Paint. Other great apps like TriangleDraw are IsoSketch (Paid), Hexels (Paid) and Triangle Pixel Pusher (Paid).
Grid Paint is an online drawing tool using various types of grids (squared, triangular, hexagonal). Drawing by grids is something like pixel art, but in pixel art you have only square pixels. Here you have also triangular or hexagonal pixels.
Unleash your inner gridded side by effortlessly drawing on an angled isometric grid, creating beautifully precise geometric artwork. IsoSketch is simple and a blast to use. Yet you have full control with color, opacity, fills, strokes, layers, background images, and much more.
Marmoset Hexels™ is a grid-based painting tool for vector art, pixel art, design, and animation. A geometric canvas grid lets artists create complex pixel and vector designs with the stroke of a brush. FEATURES • A totally new way of creating art.