# What Is a Window Manager on Mac

What is a window manager on Mac? Built-in controls, snapping apps, tiling window managers, and scrolling strips, in plain language.

What is a window manager on Mac? It is the software that decides where a window sits, and what happens when you open another one. macOS already overlaps windows. An extra app can snap one, tile all of them, or scroll them. The list of apps is the [Mac window manager](/guides/mac-window-manager) page, not this one.

## What macOS already does

With nothing installed, a new window opens on top, usually at a size the app remembers. You drag it. Command-Tab switches apps. Mission Control (Control-Up Arrow) shows the pile. That is enough for one or two windows.

Four built-in tools go further:

- **Spaces** are extra desktops, up to 16. Control-Left Arrow and Control-Right Arrow move between them. A Space hides other projects. It does not tidy the windows inside one project.
- **Stage Manager** keeps one app, or one group, in the centre and parks the rest as thumbnails. Turn it on from Control Center.
- **Split View** puts two apps in a full-screen Space.
- **Window tiling**, on macOS 15 and later, snaps a window to a half or a quarter on the normal desktop. It does not rearrange anything when you open a new window.

If one of those matches how you work, you do not need another app. [How to organize windows on Mac](/guides/how-to-organize-windows-on-mac) starts from the mess. [Split screen on a Mac](/guides/mac-split-screen) is the choice between tiling and Split View.

## Three kinds of app

Ask what a new window does.

**Snapping.** Nothing happens until you drag or press a key. Then that one window jumps. The others stay put.

**Tiling.** Windows do not overlap. Open one and the others shrink so they all fit.

**Scrolling.** Windows do not overlap, and they do not all have to fit. A new one does not resize the others.

Those three sentences are the definition. Which apps do which job is [Mac window manager](/guides/mac-window-manager). How the strip feels is [scrolling window manager macOS](/guides/scrolling-window-manager).

![Columns on a Ribbon strip. The window in front stays wide, and the next app is partly off the right edge.](/media/screenshots/02-strip.jpg)

[Ribbon](https://meetribbon.app) is one scrolling example: Apple silicon, macOS 14 or later, $17 for one Mac, $39 for three, $59 for five. The apps in each group, and which to open next, are on [Mac window manager](/guides/mac-window-manager).


## FAQs

### Does macOS have a window manager already?

Yes. Windows overlap, Spaces add desktops, Stage Manager hides what you are not using, and macOS 15 can snap windows to halves and quarters. Extra apps replace those habits with a stricter rule.

### What is the difference between snapping and tiling?

Snapping moves the one window you asked about. Tiling keeps every window on screen without overlap, and shrinks the others when you open a new one.

### Is a scrolling window manager a window manager?

Yes. Windows still do not overlap, but they do not all have to fit, so opening one does not shrink the rest. The detail is on the scrolling window manager page.

### Do Mac window managers need SIP off?

No, except some optional yabai features. The others move windows with the Accessibility permission and leave System Integrity Protection on.