StepCase's SteadyCam Premium (now called Darkroom Pro) is similar to other apps we've reviewed such as Sudobility's Night Camera. What these apps do is to rely on the iPhone's built-in accelerometer to gauge when you're holding the iPhone steady so you can take sharper pictures in low light.
iPhone and iPad apps tagged "low-light photography."
Night Camera Aspires to Let You See Clearly in Dim Light
I think the iPhone's built-in camera is pretty good, as far as cellphone cameras go. The one thing it, and probably every other cellphone camera, has a problem with, is taking pictures in low light.