Sim Daltonism/
The color blindness simulator
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Chris Messina

Black Light Pro - Color effects on a schedule

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Raycast
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Black Light Pro lets you add visual effects on your screen to rest your eyes or to have fun. Setup your effects and switch when needed with a hotkey or at predetermined times, including sunrise or sunset.

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.

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Chris Messina
Hunter
It's like Night Shift on... steroids!
Charles Magnuson
When using this application, it appears to be impossible to tell which screen is which. When I have a laptop and two external displays connected, the application lists "Screen 1", "Screen 2", and "Screen 3", but there is no way to determine which screen corresponds with each number. If I select only two of the screens and apply an effect, the effect is applied to all three screens. How do I apply effects to only one or two screens without affecting all three screens???
Michel Fortin
Maker
@magnuson You're making me realize this is much less intuitive than I though, so here's a small explanation: 1. each effect has its own associated set of screens. 2. clicking on an effect in the Preferences window will activate it on the associated screens. So far, so good, but: 3. if you change the associated screens after selecting the effect, it won't automatically remove the effect on the deselected screens. I should probably fix that. 4. to make matters worse, clicking the checkbox to deactivate the effect will only do so on screens associated with the effect. This would not be a problem if not for (3). So seeing the effect properly on the right screens currently requires a small dance toggling between an effect that applies to all screens and one that only applies to the screens you want. That's not good. Thank you for the feedback, it'll be helpful. And let me know if you have other questions.
John Foster
cool