Fityk

Curve fitting tool

Science

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Screenshots & videos

About

Fityk [fi:tik] is a program for data processing and nonlinear curve fitting. Primarily used: but it is suitable for fitting any curve to 2D (x,y) data. - by scientists who analyse data from powder diffraction, chromatography, photoluminescence and photoelectron spectroscopy, infrared and Raman spectroscopy, and other experimental techniques, - to fit peaks – bell-shaped functions (Gaussian, Lorentzian, Voigt, Pearson VII, bifurcated Gaussian, EMG, Doniach-Sunjic, etc.),

Additional information

Project

Developer: Marcin Wojdyr
License: GPL-2.0-or-later (free software)What this license lets you do
Homepage: fityk.nieto.pl
From the project: Report a bug

Install

Available via: Flatpak · Arch Linux (2) · Debian · Ubuntu · Fedora · openSUSE · Gentoo · Nixpkgs
All 9 packagings
Flathub (Flatpak), AUR, AUR (Git build), Debian, Ubuntu, Fedora, Nixpkgs, openSUSE, Gentoo (Candidate build)
Flatpak sandbox: Limited access
Runs in a sandbox with no access to your personal files or devices beyond what's listed.

About this data

Sources: 13 independent sources agree
Catalog data as of: October 12, 2026

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How each source lists it (9)

Source	Name	Version	Built by	License	Description
Flathub (Flatpak)	Fityk	v1.3.1	—	GPL-2.0-or-later	Curve fitting tool
AUR	fityk	1.3.2-2	—	GPL	A program for nonlinear fitting of analytical functions to data.
AUR (Git build)	fityk-git	r1713.d3bd1341-1	—	GPL2	A program for nonlinear fitting of analytical functions to data.
Debian	fityk	1.3.2-3+b4	Distribution build	—	general-purpose nonlinear curve fitting and data analysis
Ubuntu	fityk	1.3.2-3build4	Distribution build	—	general-purpose nonlinear curve fitting and data analysis
Fedora	fityk	1.3.2	Distribution build	GPL-2.0-or-later	Non-linear curve fitting and data analysis
Nixpkgs	fityk	1.3.2	Distribution build	GPL-2.0	Curve fitting and peak fitting software
openSUSE	fityk	1.3.2	Distribution build	GPL-2.0-or-later	Non-linear curve fitting and data analysis
Gentoo (Candidate build)	fityk	1.3.2-r1	Distribution build	GPL-2.0-only	General-purpose nonlinear curve fitting and data analysis