Great noise reduction

Im using an iPhone 5s, so the results might be different with the 6/6 plus.
Anyway, if you take a photo with the regular cam and this app, the pic from Cortex has no noise or at least much less noise and even the graininess is reduced significantly and to a very "fine" grain if that makes sense.

However you have to hold still or it will have motion blur, especially in the background if you zoom in.
Also the photos can sometimes have a softer look and not quite as sharp, but for the most part its not an issue.

Worth a dollar, just know the limitations.

Jimmy Nutren about Cortex Camera