If this sounds like your week
Monitorian is deliberately tiny. That's the appeal — and the ceiling.
Monitorian is a lean open-source utility that adjusts brightness (and on capable panels, contrast) for several monitors at once, and it does that cleanly. Its minimalism is a feature. But it intentionally stops there: no named presets, no automatic switching by app or clock, no memory across docking, no source selection, no window tooling.
Where tooling usually breaks
A single-purpose tool leaves the workflow to you.
So the moment your needs grow past "set the level," the manual work returns: reconfiguring after every reconnect, re-levelling when the task or the daylight shifts, and double-checking that the change reached the panel you actually meant.