isolad is described as 'creative app for drawing isometric artwork. It provides a sort of 3D sketchup where you draw with your finger or Apple Pencil using a grid of magnetic dots'. There are three alternatives to isolad for iPad, iPhone, Mac and Windows. The best alternative is Marmoset Hexels 3. Other great apps like isolad are Isometric (Paid) and IsoSketch (Paid).
Hexels is a creative suite for grid-based painting, animation, and design. The Hexels canvas is a paintable grid of geometric shapes that lets artists create complex designs with the stroke of a brush.
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.