F.lux

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f.lux is a cross‑platform program that automatically adjusts your display’s color temperature based on your location and the time of day. The idea is to ease eye strain at night and help sleep by making colors warmer after sunset and restoring normal colors after sunrise.

How it works
- You choose a location (city name, ZIP code, or coordinates).
- f.lux uses local sunrise and sunset times to gradually shift your screen to warmer tones at night and back to normal in the morning.
- It offers presets like film mode (reduces red tint for 2.5 hours) and darkroom mode (no effect on night vision). You can also invert times for daytime use if you work at night.

Extras
- It can control Philips Hue lights to match your screen’s color temperature.

Availability
- Windows, macOS, and Linux (not Ubuntu 18.04 LTS).
- iOS version exists but requires jailbreaking (not in the App Store).
- An Android version is available in preview.

What science says
- Some studies link bright blue light at night to melatonin suppression, but later research suggests changing color alone (without brightness changes) may not prevent sleep disruption.
- f.lux supporters believe warmer colors help sleep, but the software hasn’t proven sleep benefits in controlled studies. Apple’s Night Shift is a similar feature, and a 2021 study found no sleep improvement from it.
- Despite the mixed science, f.lux has many positive reviews from tech writers and users.