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Fityk is nonlinear curve-fitting and data analysis software. It supports data visualization, separation of overlapping peaks, and least squares fitting using standard Levenberg-Marquardt algorithm, a genetic algorithm, or Nelder-Mead simplex method. It knows common bell-shaped functions (Gaussian, Lorentzian, Pearson 7, Voigt, Pseudo-Voigt) and polynomials, but more sophisticated formulae can be added if needed. It also enables background substracting, data calibration and task automation with a simple script language. It is being developed to analyze powder diffraction patterns, but can be used to fit analytical functions to any kind of data.


User manual available at the official website and at


Download version 1.2.9 (stable)
released on 13 April 2014

yes, see the website

VCS Checkout



LicenseVerified byVerified onNotes
GPLv2orlaterJanet Casey4 March 2003

Leaders and contributors

Marcin Wojdyr Maintainer

Resources and communication

Audience Resource type URI
General Homepage
Developer Developer
Users Forum!forum/fityk-users

Software prerequisites

Kind Description
Required to build wxWidgets 3.0 or later (for GUI only)
Required to build Lua
Required to build readline and gnuplot (for command line only)

This entry (in part or in whole) was last reviewed on 15 May 2015.


Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.3 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the page “GNU Free Documentation License”.

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