Fitspy is described as 'Generic tool dedicated to fit spectra in python with GUIs that aims to be as simple and intuitive to use as possible' and is an app in the development category. There are three alternatives to Fitspy for a variety of platforms, including Windows, Linux, Mac, BSD and Snapcraft apps. The best Fitspy alternative is LabPlot, which is both free and Open Source. Other great apps like Fitspy are Fityk and PeakFit.
LabPlot is a free, open source and cross-platform Data Visualization and Analysis software accessible to everyone and trusted by professionals.
Fityk is a curve fitting and data analysis application, predominantly used to fit analytical, bell-shaped functions to experimental data. It is positioned to fill the gap between general plotting software and programs specific for one field, e.g. crystallography or XPS.
PeakFit is a nonlinear peak separation and analysis software package for scientists performing spectroscopy, chromatography and electrophoresis.
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