f.lux - Adjusts your computer's display to adapt to the time of day

I love this app. I've been using it for years. You don't realize how harsh your screen is until 5:30 comes around, when it gently becomes warmer and easier on the eyes. Highly recommended!

I have been using this for around 3 years and it has been a game changer. The first time I used it was hard to get used to, but after a few days it made working after 5 a whole lot easier.

Using it for more than 6 months now. An eyerevolution!

Huge fan! Flux keeps my eyeballs feelin' good into the wee hours.

Great tool for everybody who works in the dark. Can really feel the difference on my eyes.

Love it. It actually helps to get better sleep.

Two years of using this and feels as if my eyes are incredibly indebted to @herf . Such a beautiful product :)

Definitely one of the first apps I suggest to anyone who buys a Mac. Can't use my machine now without it running of an evening!

This is a great tool, but like Apple's Night Shift mode, it's important to turn it off if doing any art, like painting, drawing or editing photos.

I love f.lux. I swear it has improved my sleep cycle and reduced guilt for those evenings I need to be on the computer. I do have to remember to turn it off when dealing with product designs, photos etc - but that's the only inconvenience with the product, really.