Black Light 3 4+

Color effects for your screen

Michel Fortin

    • $24.99



Add visual effects to your screen so your eyes can rest or for fun. Setup your effects and switch when needed with a hot key, at predetermined times, or based on the frontmost app.


Each effect can include a mix of dimming, tinting, clipping, gamma shift. It can also invert colors and make an adjustment for HDTV luminance. Create the effects you need. Invert and make the screen all-red if you’re into astronomy. Tint with orange-yellow to help you sleep better or blue to keep you awake.

• Dimming: Reduce screen luminosity by dimming each pixel. Useful to reduce the luminosity of LCD screens beyond the minimal value of the back light.

• Tinting: Simulation of a color filter of a chosen color put in front of the screen. Lets you change the tint by setting the white point. Useful to give your screen an orange glow and reduce blue light at night, but works with any color.

• Clipping (Underexposure & Overexposure): Replace dark grays under a chosen threshold with black, or light grays to white. Darker or lighter colors might change hue slightly.

• Gamma Shift: Makes grays lighter or darker, but without saturating at a threshold (unlike clipping). Useful to make subtle dark or light details more visible, in a dark game for instance.

• Invert Screen: Reverse blacks and whites, giving you a negative of the image on your screen.

• HDTV Luminance Adjustment: Adapt image for the 16–235 luminance range used by some high-definition television sets when connected by HDMI. Normally, your computer should be capable of automatically adjusting output values accordingly, but this isn't always possible when the TV is connected through an adapter.


Effects can be automatically triggered based on your Mac’s clock or your local sunrise and sunset time. You can chain multiple transitions to change colors as you like throughout the day.


Always want to use a specific effect while watching videos or playing games? You can associate effects with certain apps and Black Light will automatically switch to those effects while the app is frontmost… and automatically switch back when the app is no longer frontmost.


Have more than one screen? No problem. While an effect applies to all screen, you can customize its settings separately for each screen. An easy way to make the secondary screen less visible during certain tasks for instance.


Black Light effects can have different settings after a certain time with no mouse or keyboard input. Use the "Vary for Inactivity" button to specify what the inactive version of an effect should look like.

If you have multiple screens, you can also use inactivity to highlight one screen the mouse pointer is currently on.


Each effect can be activated from any app by assigning it a global hot key. In addition, you can adjust various aspects of the currently active effect using more configurable hot keys.


The dock menu will show you the list of available effects. From there, you can make effects active or inactive even if they don’t have a hot key. You can also move the Black Light icon to the menu bar, freeing space in your dock.


Black Light will not work with screen connected using certain USB DisplayLink adapters, or with an iPad connected using Sidecar.

App Privacy

The developer, Michel Fortin, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer's privacy policy.

Data Not Collected

The developer does not collect any data from this app.

Privacy practices may vary, for example, based on the features you use or your age. Learn More


  • Family Sharing

    Up to six family members can use this app with Family Sharing enabled.

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