Coloursimulations is described as 'For users with normal colour vision the application provides real-time simulation of the common forms of inherited red-green colour-blindness
For colour deficient users the application provides colour discrimination assistance' and is an app. There are five alternatives to Coloursimulations for Mac, Windows, Linux and Web-based. The best Coloursimulations alternative is DaltonLens, which is both free and Open Source. Other great apps like Coloursimulations are Color Oracle, Sim Daltonism, RGBlind.com and Color Blindness Simulator.