Noise Ninja is described as 'The most effective and productive solution for removing noise and grain from digital photographs and scanned film images. It must-have tool for anyone shooting in low-light or fast-action situations -- including news, sports, wedding, and event coverage --' and is an app. There are seven alternatives to Noise Ninja for a variety of platforms, including Mac, Windows, Linux, iPhone and iPad apps. The best Noise Ninja alternative is Topaz Photo AI. Other great apps like Noise Ninja are Neat Image, Super Denoising, Dfine and Noiseware.