f. lux for iOS is designed to give you a better experience with your computer. It regulates the colors of your display so it can match the time of the day properly. That can reduce your eye strain or your headache or even help you sleep at night.
Thanks. I've actually been doing something like that, but I can't seem to get the color to match the flux color I have on my laptop. On my laptop it's redish but I don't really notice it. When I set the hue to the pure red and adjust it's intensity, it's just different. It's goes from not red enough to suddenly too red and too dark. I'm wondering if anyone else has been able to actually match their iPhone/iPad display color to their laptop flux color?
I don't know but it doesn't have to be the same. It just has to be sufficiently lacking in blue light so as to not disrupt your circadian rhythm. Maybe try 800K on the laptop. That's very red, if not pure red. Or, try something not so red in the color filter in iPadOS.
Yes really there are two markets: eyewear manufacturers (including BluTech, from your link) have started filtering a little bit of light, but usually these wavelengths really don't make a big difference for computer screens. BluTech is unique because you can see the difference, so it does more than most.
Also, there are efforts to make screen covers, or to move the blue primary over a bit or to change screen spectrum by a tiny amount. There you find some self-described "standards" (no consensus standard) for blue-light safety in screens, with a ton of press about it. I like what they are doing for flicker, but the spectral changes cannot make much difference, and so the press around it seems very disingenuous: