pro Fit is described as «Macintosh (Mac OS) application for data/function analysis, plotting, and curve fitting. It is used by scientists and engineers to analyze their measurements and the mathematical models they use to describe them» and is an app in the education & reference category. There are more than 10 alternatives to pro Fit for a variety of platforms, including Windows, Mac, Linux, iPad and Python. The best alternative is GnuPlot, which is both free and Open Source. Other great apps like pro Fit are Matplotlib, SciDaVis, Graph and python(x,y).