Why everything on apple tv app is so dark regardless of which device you watch the content on? HDTV, PC, IPhone, IPad, or etc.

Hi Rusbrush,

We understand the brightness on your Apple TV is not as bright as expected. We would like to help provide a way to adjust the Display Accommodations.

Use Display Accommodations on Apple TV

"This setting adjusts the level of dimness or brightness on your display.

1. In Settings  on Apple TV, go to General > Accessibility > Display Accommodations, then turn on Light Sensitivity.
2. Select Intensity, then swipe to adjust the percentage of display intensity."

Have a great week!