I've used f.lux but the problem I find is that if I'm unwinding in the evening watching some youtube / netflix on my laptop the colour shift is quite annoying.

I've used f.lux but the problem I find is that if I'm unwinding in the evening watching some youtube / netflix on my laptop the colour shift is quite annoying. By contrast, on my iphone I tend to not need accurate colour representation so the recently introduced Night Shift Mode is hardly noticed.