Change your Mac's screen color,
starting with why it's blue

Why your screen looks tinted blue

A screen's "tint" is the balance of red, green, and blue light it outputs to produce white, separate from how bright that white is. Displays are calibrated to a standard called correlated color temperature, measured in kelvin, and most consumer monitors target roughly 6500K, a cool daylight white. That is a deliberate accuracy target, the same one photo and video work is graded against, not a flaw in your particular Mac.

It reads as blue mainly by comparison. Indoor lighting runs warmer, around 2700K to 3000K, and paper reflects whatever light is in the room rather than emitting its own. Next to either, a 6500K screen looks cool and blue-white, especially at night when the contrast is sharper and your eyes have adjusted to dimmer, warmer surroundings. If a screen suddenly shows an actual color cast that looks wrong rather than just cool, that is usually a display color profile issue, handled separately in System Settings under Displays and Color Profile, not something a tint adjustment fixes.

How to change your screen's color on a Mac, no app required

macOS has two built-in tools for this, and both are worth trying before installing anything.

• Night Shift lives in System Settings → Displays → Night Shift. It warms the whole screen on a schedule, sunset to sunrise or a custom time range, with a single slider from less warm to more warm. It is built for reducing evening blue light exposure ahead of sleep, and it works well for that.
• Color Filters lives one level deeper, in System Settings → Accessibility → Display → Color Filters. Turn it on, set Filter Type to Color Tint, and you get a hue wheel plus an intensity slider, updating the screen live as you drag. This is the closest thing macOS has to a genuine custom tint, and it costs nothing.

Both have real limits once you use them daily. Night Shift only warms; it has no way to push toward green or any other hue, and it cannot be combined with dimming or contrast changes. Color Tint can reach any hue, but it is one tint at a time: there is no way to save a second variant and switch between them, no per-display control if you run more than one monitor, no independent red, green, and blue channel sliders, only a single hue and intensity, and no quick toggle. It sits several menus deep in Accessibility settings with no menu bar shortcut by default.

What Nox's custom presets add

Nox starts from wherever you like, any of its 12 built-in presets or a plain screen, and turns tinting into something you shape rather than pick from a wheel.

• Independent red, green, and blue channel factors, so you can push one color without dragging the others along with it.
• Intensity, dimming, black point, and contrast sliders, adjustable alongside the tint itself rather than as separate, unrelated settings.
• Advanced controls for gamma, color temperature from 2700K to 6500K, and per-channel intensity, for finer shaping than a single hue wheel allows.
• Live preview on your actual screen as you drag any slider, not a swatch or a separate preview pane.
• Named, saved presets you can come back to, edit later, or delete with a confirmation step so nothing disappears by accident.
• A color swatch next to each preset in the menu bar dropdown, so you can tell them apart at a glance.

That editor exists because tint alone rarely solves screen discomfort on its own. The research behind Nox's spectral presets looks at specific wavelengths, not just overall color balance, for people whose eyes need more than a warmer white. If you are building a custom tint purely for taste or color preference, the sliders work the same way either way.

Honest limits

Nox's tinting, like Night Shift and Color Filters, works by adjusting the display's gamma tables in software. It does not change backlight power, so it will not extend battery life the way lowering brightness does. Pushed to an extreme, any custom tint reduces color accuracy, which matters if you are doing photo or video work in between; keep a neutral preset ready to switch back to for color-critical tasks. None of this replaces an actual monitor calibration if your work depends on precise color.

What Nox changes on your Mac

Nox is a menu bar app for macOS 14 and later, downloaded as a signed DMG from this site. While running, it writes to the display's gamma tables through the standard macOS display APIs. It installs no kernel or system extensions and requires no account. Toggling the filter off or quitting Nox restores your display immediately. To uninstall, quit Nox and move it from Applications to the Trash. Details on data handling are in the privacy policy; support is support@getnoxapp.com.