Contain
All your windows, in one window
Contain gathers the windows you already have open — a document, a browser, a terminal — into one window with tabs. Click a tab to switch. Click ↗ to send a window back to the desktop, exactly where it was. Nothing is copied or mirrored: it is your real window, just kept somewhere tidier.
Your windows become tabs.
Windows, not applications: three documents from one editor are three tabs.
Two untouched screenshots of one Contain window — click between the tabs.
Tab one: EasyHomebrew, held inside Contain. Sidebar, list, toolbar — the whole app, working as usual.
One task, one window
Editor, terminal and browser as three tabs in a single window you can park wherever suits you.
Less hunting around
Stop cycling through ⌘-Tab to find the window you had a minute ago. Click its tab instead.
Tidy up, then undo it
Gather what you need for an hour of work, then let it all go — every window returns to where it came from.
Getting started
Three clicks from a cluttered desktop.
Nothing to configure and no shortcuts to learn.
Open the windows you want
Anything already running works — a document, a browser, a terminal. There is no list of supported apps.
Click the Contain window and pick one
You get a grid of everything open. Click a tile and that window becomes a tab.
Work — and let go when you are done
Click a tab to switch. Click ↗ or press ⌘W to send a window back, or quit Contain to release them all.
More about Contain
The details, a page each
Features
Everything Contain does with a window once it holds it.
Requirements
macOS 13 or later and one permission. Signed and notarized by Apple.
Limitations
The few behaviours macOS forces on any app that moves windows.
Changelog
Every release since the first, newest at the top.
Privacy policy
What leaves your Mac and what does not. There is no analytics in the app.
Terms of use
The licence, the 3-Mac limit and the 30-day refund.
€6 once · 3 Macs
Try it on a window you already have open
Contain borrows a window you already have open and gives it back the moment you ask, exactly where it found it. One €6 key covers 3 of your Macs, with every 1.x update included.
