Developer(s)William G. Bardsley, University of Manchester
Stable release
8.07 / January, 2023
Operating systemWindows
Typenumerical analysis

Simfit is a free open-source Windows package for simulation, curve fitting, statistics, and plotting, using a library of models or user-defined mathematical equations. Simfit has been developed by Bill Bardsley of the University of Manchester.[1] Although it is written for Windows, it can easily be installed and used on Linux machines via WINE.[2]

Simfit is developed using Silverfrost Limited's FTN95 Fortran Compiler and is currently featured on their website as a showcased application. The graphical functionality in Simfit has been released as a Fortran library called Simdem which allows the programmer to produce charts and graphs with just a few lines of Fortran. A version of Simdem is shipped with the Windows version of the NAG Fortran Builder.[3]

A Spanish-language version of Simfit is maintained by a team in Salamanca.


  1. ^ Burguillo, F.J.; Holgado, M.; Bardsley, W.G. (2003). "Using the SIMFIT Statistical Package to teach Data Analysis in Experimental Sciences". Revista de Educacíon en Ciencias-Journal of Science Education. 4: 8–14.
  2. ^ "WineHQ - Simfit". Retrieved 2021-10-04.
  3. ^ Chivers, Ian D.; Jane Sleightholme (August 2007). "Introduction to NAG Fortran builder". ACM SIGPLAN Fortran Forum. 26 (2): 12–24. doi:10.1145/1279941.1279943. S2CID 7955473.