The only good clock app – Nite Time - a simple night clock for your nightstand with flashlight Review
This is the only heckin good clock app on the entire gosh darned app store. It's got an actual black background, no silly fonts, and lets you swipe to change brightness. It doesn't have iPhone X full screen support, but that's fine because the clock is big enough anyway, and since it has a black background it blends into the letterbox.
If you have an iPhone X, you can even pair it with Guided Access mode to remove the home bar at the bottom.
Review by y2bd on
Nite Time - a simple night clock for your nightstand with flashlight.