Why might colors look different?

This may not be the best place to ask, but in case it is a setting or shader or something: I build for WebGL and it looks great on my machine. When running on another machine, the colors are really off. Too dark, and white is not white, red is not really red. I know it sounds like the other machine may need to adjust settings, but they seem ok with other programs. So is this a graphics card issue? Something else? Would HDR help?

I think it might be a monitor related issue, try to connect the same monitor to each pc. If this doesn’t change the symptoms, I am 99% sure it is a Graphics card related issue in this case you should update your drivers or replace them.