At present, fitteia contains the following core modules, which have the indicated general purposes:

This module provides a comprehensive set of tools for the model fitting of a theoretical model to a given data set.

The plotter module helps to refine the graphical representation of data and/or the model fitting curves.

The calculator module provides a simple way of performing mathematical operations using the parameters directly from the fitter module. It can also be used to generate vectors/matrices for any simulation purpose.

This module enables one to make alterations on the LaTeX-based reports generated by fitteia for each model fitting project, in order, for example, to make it fit for publication.

Upload is the module that allows users to upload their files into their fitteia accounts.