Apps similar to Brisync include f.lux, which is free. Other options are Twinkle Tray, Redshift, Solace and LightBulb. Color Temperature Tools like Brisync are a crowded field, with more than 50 alternatives for Windows, Mac, Linux, Android and Chrome OS.
Setting the color temp of the screen really only requires about 40 lines of C (80 or so all inclusive). sct is a crude utility which does roughly that. I’d say exactly that, but some of the calculations aren’t actually exact.
Brightness Controller easily allows windows users to set the brightness level of your LCD screen (It is very useful when your screen doesn't allow settings to be remembered without having to push many buttons on your screen!).
Shady puts a shade over your screen to help soothe your tired or dazzled eyes. You can use it to reduce your Mac's brightness far below the usual minimum, without any risk of damage to your screen.
United Kingdom
A Python program that calculates ambient brightness and sets screen's correct backlight using a camera.
Stop burning your eyes! myPoint Shade is caring for your eyes' comfort.
If you work in a dark room or struggle with eye strain and headache, myPoint will tune up your displays - this way it will care for your health and comfort.
myPoint allows you to adjust the brightness o.
Lumen - magic auto brightness based on screen contents. You control Lumen simply by using your brightness keys - it'll automatically learn your preferences.
United States
EyeAway is a beautiful, privacy-first macOS app that helps reduce digital eye strain using the proven 20-20-20 rule. Every 20 minutes, look 20 feet away for 20 seconds - your eyes will thank you.
LiteBright is a lightweight native brightness controller for Windows 10 and 11. It lets you control brightness across multiple monitors from the system tray, adjust displays independently or together, and use global keyboard shortcuts for quick changes.
Free, open-source display control for Windows 11: one brightness slider for every monitor (DDC/CI and laptop panels), night light, focus mode, keep awake, per-monitor taskbar hiding and glass, OLED care, your monitor's own settings, hotkeys and a CLI.
India
Away From Keyboard is an app that reduces eye strain with reminders to take a break.
Romania
EU
