Fit2Go, an application for cellular mobile phones, is a linear and quadratic function graphing tool and curve fitter. Students can view a phenomenon, identify variables, conduct experiments and take measurements in order to construct models to the phenomena.

Fit2Go supports activities of exploration and modeling. It supports data collection by proposing a model that can appropriately describe the user's data. This tool highlights the numerical aspects of a phenomenon and together with Sketch2Go form a comprehensive view on models and modeling.