Default Icons picks up where Koloria left off. Koloria was pixel-perfect at a single size, 32px. Modern interfaces use icons at several small sizes, and most sets get there by scaling one shape, which softens edges and throws strokes off the pixel grid.
Default Icons treats each size as its own drawing. Every icon is adjusted for 15, 16, 20 and 24px with the same stroke weight, spacing and optical corrections, so a 15px icon in a dense table is as sharp as a 24px one in a toolbar.
A free starter set is already on defaulticons.com. Next on the roadmap: SVG, PNG and WebP exports, duotone and gradient variants, and an empty-state generator built from the same icons.