RTModel models and interprets microlensing events. It uses photometric time series collected from ground and/or space telescopes to propose one or more of the following possible models:

- single-lens-single-source microlensing;
- single-lens-binary-source microlensing, with or without xallarap; and/or
- binary-lens-single-source microlensing, including planetary microlensing, parallax and orbital motion.

All models include the finite-size of the source(s). The modeling strategy is based on a grid search in the parameter space for single-lens models, whereas a template library for binary-lens models is used including all possible geometries of the source trajectory with respect to the caustics. In addition to this global search, planets are searched where maximal deviations from a Paczynski model occurs. The RTModel package also including subpackages for creating an immediate visualization of models and the possibility to review each individual fitting process as an animated GIF.