Center instantly
Left-click the yellow button and the window snaps to the horizontal center of the display it lives on.
Your traffic lights,
supercharged.
Traffic Lights is a tiny native menu bar app that turns the red, yellow and green window buttons into instant window controls — center, fill and hide, all with a single click.
Red
Hides the whole app
Yellow
Centers it horizontally
Green
Fills the screen with your margins
Small app. Big difference.
Every feature lives where you already click — the buttons in the corner of every window.
Fill with margins
Left-click the green button to fill the screen using the margins you choose — set them per display.
Hide, don't close
Opt-in: the red button hides the whole app (like ⌘H) instead of closing — and only when the window can actually be minimized.
Escape to native
Hold ⌘, ⌥, ⌃ or ⇧ while clicking to get macOS's built-in behavior — like ⌥-click to act on every window.
Exclude any app
Add apps to an exclude list and Traffic Lights leaves their buttons completely alone — they keep their normal macOS behavior.
Per-display margins
Set different margins for each screen. Your choices are remembered per display and per monitor arrangement.
Launch at login
Flip one switch and Traffic Lights is ready the moment you sign in. No login items to wrangle.
Automatic updates
Built-in updates via Sparkle: new versions are checked in the background, and you can update any time from the menu bar.
Up and running in a minute.
No window. No dock icon. Just a quiet helper in your menu bar.
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1
Download & open
Drag Traffic Lights into your Applications folder and launch it. It tucks itself into the menu bar.
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2
Grant Accessibility
Allow Accessibility access once so the app can move and resize the windows you click on.
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3
Click a traffic light
Center, fill or hide from the buttons you already use a hundred times a day.