I think I tried this years ago but didn't like it, because it uses a software "shade" over the screen, lowering contrast, instead of actually manipulating the hardware backlight of the monitor like MonitorControl does. (Except the M1 Mac Mini doesn't let you control the backlight over HDMI, so MonitorControl falls back to software brightness adjustment for my second monitor. Boo.)Been using Splasm’s brightness control from the days of Snow Leopard. Still using it on Mojave.