Open Source Twilight Alternatives
Twilight is described as 'The app filters the blue spectrum on your phone or tablet after sunset and protects your eyes with a red filter. The filter intensity is smoothly adjusted to the sun cycle based on your local sunset and sunrise times'. There are more than 25 alternatives to Twilight for various platforms. The best alternative is Redshift, which is both free and Open Source. Other great apps like Twilight are LightBulb (Free, Open Source), Red Moon (Free, Open Source), RedshiftGUI (Free, Open Source) and Gammy (Free, Open Source).
- Redshift adjusts the color temperature according to the position of the sun. A different color temperature is set during night and daytime.
- Background application that adjusts screen gamma, making the colors appear warmer at night, reducing strain on your eyes.
- The app is free on F-Droid and on GitHub but you can buy it on the Google Play Store to support the developer.
- Free • Open Source
- Android
- F-Droid
- RedshiftGUI changes the color temperature of your monitor to better match that of your surrounding.
Discontinued
The project seems to be no longer developed. Last version, 0.2.4, released in August 2014, can be still downloaded from GitHub.
- Free • Open Source
- Windows
- Linux
- Adaptive screen brightness and temperature for Windows and Linux.
- Enables darker-than-dark Desktop dimming for your displays.
- Small resource footprint, minimal User Interface.Discontinued
The last commit to the project is from November, 16 2017 and it gave some users a bunch of deprecation errors when they tried to install and run it.
- Free • Open Source
- Mac
- Windows
- Linux
- Shifty was made to expand the capabilities of the built in Night Shift feature in macOS. You can disable Night Shift for specific apps and custom time periods.
- 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.
- Free • Open Source
- Mac
it can reduce screen brightness. as far as i know f.lux can not reduce screen brightness. - This add-on allows to apply a filter in the web pages in order to attenuate the blue light.
- A programs which adjust screen brightness due to light detectedby webcam
- Free • Open Source
- Linux