Simple to use iterative regression program. Unique: multidirectional fitting, which produces much better results for invertible model functions. (E.g. it finally demonstrates that the Body Mass Index = m/h³, not m/h².) Realistic parameter confidence estimation based on x and y data precision and error propagation through the model function. Version 1 features 16 common models with real life examples from different sciences, but more will be added upon request. Also good for education because of the visualisation of the fitting process.