Cf.lumen has this feature (yes, true red colouring, not just a yellow tinge like night shift), but it requires root and it's not updated anymore. (you need to f

Cf.lumen has this feature (yes, true red colouring, not just a yellow tinge like night shift), but it requires root and it's not updated anymore. (you need to find the 3.72 beta version online for it to work on Android Q)