F.Lux?

It's a free app. You can grab it here.

I used it on my iPhone 4s and 5c the whole time I had them. They never finished their Android port though. I also used it on my MacBook for quite some time. I just never reinstalled it since I got my rMBP.

It's a personal preference kind of thing. But it's useful at night. Less blue light (wavelength keeps brain awake more than a warmer color temp), and it's less blinding should you need to check something in the night.

Wish I could have it on my 6 Plus, but it came with 8.1.3 when I got it used.

Should work fine on your MacBook. I had it on my Late '08 back in the Leopard and Snow Leopard days.

I like it on my MacBook Pro, but hate it on my iPhone. It really does make a big difference in screen color and intensity. Just remember to disable it if you're using anything like Photoshop, or your colors will be off.

I tried it, liked the concept, but had some funky scrolling artifacts that made my eyes feel like they were being pulled out of my head.

I used to use it all the time, the change is so gradual it gives your eyes plenty of time to adjust. It's pretty good.

I don't use it anymore since I bought a screen calibration device, it would kind of defeat the purpose.

I love f.lux for working at night. I have it on my Windows PC and my MacBook. It's one of the first apps I download whenever I do a clean install on a system.

It's a great app for softing the whites.

I have it set to disable for specific apps like photo apps and VLC.

I had it running but quit using it recently because it causes my rMBP to revert to Regular Mode from Dark Mode when I restarted and often when waking the computer from sleep mode. Not a big deal but annoying. Also, I rarely compute at night anymore so it really was very useful.

Used it for years. I highly recommend it for working late at night or in a really dark room.