Snug

Snug automatically arranges Mac windows as they open and closes gaps when windows disappear. It supports Grid, Columns, Rows, and Side layouts, with up to four windows per screen—or five in Side mode on an ultrawide or vertical display. Designed for people who want a structured desktop without manually dragging windows, Snug also includes keyboard navigation, focus modes, app groups, per-display layouts, window swapping, adjustable splits, and a visual active-window beam. It runs on macOS 15 or later on Apple silicon and Intel Macs.