You are writing, or reading, or drawing, and your eyes keep leaving the window. Up to the menu bar clock. Down to the Dock. Off to the edge of another window that is not quite hidden. None of it is urgent, and all of it is bright.
Dimming the rest of the screen is one of the oldest tricks for this. It does not stop the drift; it makes the drift land on something dark and quiet, so your eyes come back on their own. This note covers what a Mac can do about it without any extra software, what a dimming overlay is when you decide you want one, and what to check before you trust one.
What macOS can do on its own
A few built-in features get part of the way, and it is worth knowing where each one stops.
- Dark Mode turns the chrome dark — window frames, menus, the Dock. It does not dim anything; a bright document in a dark frame is still a bright document, and the menu bar is still fully lit.
- Full-screen mode hides the menu bar and the Dock for one app. This is the strongest built-in option, but it is all or nothing: the window fills the display, and moving between that app and anything else means leaving full screen or switching Spaces.
- Stage Manager tidies the other windows to the side. They are smaller, but they are still there, still lit, and still moving when something in them changes.
- Hiding the Dock removes one attractor. It does nothing about the menu bar or the other windows.
- Reduce transparency (in Accessibility settings) makes menus and the menu bar opaque. It reduces shimmer, not brightness.
If your problem is only the Dock, hide it and stop reading. If your problem is the menu bar and the edges of everything else, the built-ins run out here.
The dimming-overlay approach
An overlay is a window that sits above everything, is dark and partly transparent, and ignores clicks so everything under it keeps working. Draw it over the parts of the screen you are not using and leave the middle clear, and the effect is a room with the lights turned down everywhere except your desk.
Good overlays share a few behaviors, and bad ones fail on the same points:
- Click-through. You must be able to click a menu or a Dock icon through the dark layer as if it were not there. An overlay that eats clicks is a wall, not a shade.
- Every Space, and over full-screen apps. If the shade only exists on the desktop you were on when you turned it on, it disappears the moment you switch, which is exactly when you would want it.
- Adjustable strength. How dark the edges should be depends on the room, the display, and the time of day. A fixed value is wrong most of the time.
- A clear center. The point is contrast between the work and everything else. An overlay that darkens the whole screen evenly is a brightness slider, not a shade.
- One switch. It should come off in one motion, without a dialog, when you need the full screen for something.
- No permissions. A window that draws and ignores clicks needs no Accessibility access and no Input Monitoring. If a dimmer asks for either, ask why.
SHADE, plainly
I made Callulu, a small Mac menu bar app with eight visual cues, and SHADE is the one that answers this question. When it is on, it darkens the menu bar and the left, right, and bottom edges of the screen, continuously, and leaves the center clear. It is click-through, it follows every Space and stays over full-screen apps, and the strength is adjustable from the same menu. One toggle turns it on; the same toggle turns it off.
That is the whole feature. SHADE does not decide what counts as "work" and does not know what window you are in; it darkens the frame, and you put your work in the middle of the frame. It does not block anything, and it does not keep a record of when it was on. If it is in the way, switch it off and it is gone.
It sits beside seven other cues in the same menu — a flash to mark starting, a passing light to mark a pause, a gradual softening of the screen to mark the end of the day — and every one of them can be switched off on its own. Nothing about SHADE requires the others.
Things to check in any dimmer before you rely on it
Whatever you use, spend two minutes on these before you trust it during real work:
- Turn it on, then click something in the menu bar. It should respond normally.
- Switch to another Space, and open a full-screen app. The shade should still be there.
- Turn the strength all the way up, then down. Find the point where the edges recede without the center changing.
- Connect a second display if you use one, and check which screens are shaded.
- Turn it off. There should be no residue — no leftover dark band, no window left behind.
And know when not to use one. If you are judging color or brightness at the edges of an image, a dark frame changes how the middle reads; turn the shade off for that pass. A shade is a cue for attention, not a tool for accuracy.
Hide the Dock first, then decide
Hide the Dock. If that is enough, you are done. If the menu bar and the surrounding windows still pull at you, try full-screen mode for a day and notice whether the all-or-nothing trade bothers you. If it does — you want the edges dark but the rest of your Mac reachable — that is the case for an overlay, and the six behaviors above are the list to check it against.