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Isometric paper is built from a grid of equilateral triangles rather than squares — lines run vertically and at 30° to the horizontal in two more directions, giving three axes that let you sketch cubes, boxes, and three-dimensional objects with correct proportions on a flat page. Sheetful generates the full triangle lattice at your chosen side length, in real millimeters, so proportions stay consistent whether you're roughing out a concept or drafting something meant to be measured.
It's the standard surface for technical and engineering pseudo-3D sketching, packaging and product design mockups, and tabletop game map and dungeon design, where isometric grids are a common way to lay out rooms and terrain with a sense of depth. Set the triangle side length (the spacing between grid points), pick US Letter or A4, and adjust line weight and color to match how prominent you want the underlying grid to be.
Sketching 3D objects and spaces in correct proportion on flat paper — common in technical/engineering drawing, product and packaging design, and tabletop RPG or board game map design.
6mm is a reasonable general-purpose default. Use a smaller size for detailed technical work, or a larger size for quick concept sketching or game maps where you want fewer, more visible grid lines.
Graph paper is a square grid at 90°; isometric paper is a triangular grid built from lines at 30°/90°/150°, which is what allows it to represent three-dimensional depth convincingly on a flat page.
Yes — the ink color swatches include lighter options like Soft gray, and Fine line weight keeps the underlying grid unobtrusive.