bisk89 MacBook Pro with mini-LED is unfixable even with Stillcolor (on mini-LED the majority of temporal dithering is done on hardware instead of the OS instead in order to support the "reference mode" hardware-level color calibration features), meaning that Stillcolor is unable to fix it. There is also no way to fully turn off local dimming on mini-LED, even the dev of BetterDisplay could not figure it out. I would really recommend returning it or selling it, I tried to get mine (M1 Max 14") working for me for 2 years and it totally messed up my vision taking months to recover.
This was even worse for me because it took a whole year for me to realize that the MacBook itself was causing this, for a while I thought my vision was rapidly deteriorating or I was developing some really weird form of dyslexia leading me to see multiple neuro-ophthalmologists and neurologists (AKA even more wasted time and money…) and surprise, none of them could figure it out or simply said "my eyes were fine".
It was only one day in 2023 when I finally had a second laptop to compare it to after a family member was giving away an old MacBook (2015 12-inch single-port). After using that laptop for just a few days I had the immediate and shocking realization that almost all of these supposed "vision issues" were just gone. I could use this ancient 2015 12-inch totally fine. It felt like my vision issues had just immediately vanished. But then I went back to my 14" and all of the issues returned just as bad. After a week it finally clicked for me that it was the computer.
After realizing it was the screen, since 2023 I've tried to mess with every setting possible to see if I can salvage the computer but nothing worked. The older 12-inch MacBook (and eventually I figured out that an even older Windows laptop I owned was even more comfortable) was simply a night and day difference to the fundamentally flawed mini-LED display.
As of 2024, I sold the 14" last month after failing to get Stillcolor to work on it — yes I spent a lot of money on mine too and it was a total shame, one of my biggest regrets purchasing it and especially dissapointing because everything else about it except for the screen was great. But none of that matters if I literally can't use it as a laptop.
Now I am on an M1 Air (with Stillcolor, which actually works correctly on M1 Air) and for the first time in a while my vision finally feels NORMAL again. I also tried the M2 Air and newer Intel Airs, but the M1 Air is the only modern Mac that truly feels comfortable to me.
The only other device that has been found to be "fully compatible with" Stillcolor aside from the M1 Air is the M2 Touch Bar 13" Pro (the one with the older design and only 2 USB-C ports). However, only certain M2 Touch Bar Pros are known to be good, there is a really significant panel lottery. Multiple members here, including me, have confirmed that M2 Touch Bar models with "00000000" in the display panel ID are great and have perfect results with Stillcolor, but ones with "FMX" at the beginning of the ID cause strain even with Stillcolor.
In summary:
Stillcolor does NOT work at all on the 14"/16" mini-LED MacBook Pro built-in display.
M2/M3 Air + Stillcolor works for some and not at all for others.
The M1 Air and the "M2 Touch Bar 13" Pro models that specifically have 00000000 in the panel ID" are the only models that consistently work "the best" with Stillcolor with multiple people here.