This is far from a thorough review of the various apps, and each app might have other conditions that would make it better or worse in different situations. Nevertheless, here are a few examples.
|NightCap Pro without noise reduction|
|NightCap Pro with noise reduction|
|AvgNiteCam with 16 frames|
|Night Modes app|
|Default iPhone camera app|
|Canon T5i DSLR at f/8, 8 sec, ISO 1600, 18mm|