Quick Fit
A ready-made function from the standard library – nothing to define.
A free online platform for scientists and engineers to perform least squares curve fitting, solve systems of ordinary differential equations (ODEs), and plot experimental data.
Quick Fit
A ready-made function from the standard library – nothing to define.
Custom Fit
Need more customization? Define your own function for fitting.
Model Builder
Fit two or more functions simultaneously – the advanced route.
Every feature at a glance - scroll through a row to see its capabilities, or jump straight in.
Fit your data with a ready-made function from the standard library – no function definition needed.
Choose any function from the standard library.
Drop in a CSV with your data to be fitted
Configure and constrain the fitting parameters.
Plot your fitted data together with your uploaded data for comparison.
Fit your data with a function you define yourself – and evaluate it in batches along the way.
After adding a name and description you can write arbitrary functions in the SymPy notation on the function-edit-page.
Define the parameters of your functions and give them units, so that values get a meaning and the function can be evaluated consistently.
Choose which parameters you want to fit. Set start parameters and bounds for the parameters.
Choose the parameters for your evaluation. You can make batch evaluations by setting array-like parameters. All combinations of parameters are evaluated like that.
Edit your functions as needed. Then use the function for batch evaluations or to fit your own data
Once another researcher added a publication to his function, it will become available to everyone.
After adding a publication, no one (not even you) can modify the function and the function becomes available to everyone.
Plot and style your experimental data – group it into series and export publication-quality figures.
Drop in a CSV of experimental data – no login required.
Split data into series by a grouping column, e.g. temperature.
Set axis labels, scales, colors and markers to taste.
Download clean, publication-quality plots of your data.