What is a Window Manager on Mac?
A Mac window manager is an app that snaps, tiles, and resizes windows with keyboard shortcuts — replacing manual dragging so you can arrange apps into halves, quarters, or full-screen grids instantly.
Install a free, open-source window manager:
brew install --cask rectangleWhy people install one
macOS has basic window tiling (hold the green button) but no real keyboard-driven snapping or persistent grid layouts. A window manager adds shortcuts like "left half", "top-right quarter", or "maximize" and, for tiling managers, automatically arranges every window so none overlap — a big productivity win on large or multiple displays.
Snapping vs. tiling
Snapping managers (Rectangle, Magnet, Loop) move the focused window to a region you trigger. Tiling managers (Amethyst, yabai) automatically lay out all windows in a non-overlapping grid and are popular with keyboard-first power users. Many of the best options are free and open source and install in one command.