I also use Redshift,and an app called Twilight. It's fairly customizable if that's what you're looking for.

Twilight just doesn't feel the same. Unlike f.lux and redshift, which actually seem like they change the color of the screen, Twilight just seems to overlay a red filter. I can't tell you why, but the result is much less satisfactory.

Twilight is just a red overlay. If you want the real deal like f.lux or redshift, there's Cf.lumen (requires root) which works great and even offers a "freeloader" option for pro features.

On Linux I use the 'Negative' Compiz plugin. You can apply it on a window by window basis or desktop-wide. For both modes there are keyboard shortcuts (that's what makes it such a killer feature IMO). People find the screen weird when I enable the plugin but I'm a practical guy and this has saved my eyesight.

I know you can invert colors in OSX but the effect is desktop-wide and you can't use a hotkey to enable or disable it. Does something similar exist for other OSes?

> I know you can invert colors in OSX but the effect is desktop-wide and you can't use a hotkey to enable or disable it.

I haven't tried this myself, but I believe you could rig up something in Automator/Script Editor to toggle the inverted colors, then set up a hotkey for that service from System Preferences -> Keyboard -> Shortcuts.

I've been using this method for years. Very simple, and gets the job done. Most websites and desktop apps default to whites and off-whites which convert perfectly to blacks and off-blacks when enabled. Pocket, Firefox, and FBReader on my Android devices all have dark modes for reading on my mobile devices; takes care of all my use-cases!

That's my case too! On Windows I have to use other kind of workarounds. Dark styles on VS, stylization addons on Firefox, etc...

I use the KDE equivalent all the time. Really nice on web pages at night when they're bright white. Don't know if it's saved my eyesight but it has made things more pleasant at times. It's also really nice to be able to invert the desktop and then invert a single window (VLC) so colors are correct there.

Going to jump on this train here. F.lux on every platform I've tried has performance issues.

Guess I better jump on too: I've run flux on three machines with OSX's from Snow Leopard to ElCap: A white plastic Macbook from 2006, a late-2014 Air, and an early-2014 MBP with a triple-head display setup, and never had any problems at all. So YMMV.

Redshift is a lifesaver.

I struggled with flux on linux for a couple of years until I discovered redshift. It works flawlessly.