RaDMaX (Radiation Damage in Materials analyzed with X-ray diffraction) is a user-friendly graphical program that allows to determine the strain and damage depth profiles in ion-irradiated crystals. This task is achieved by fitting experimental X-ray diffraction data, recorded in symmetrical q-2q geometry, with a dynamical diffraction model parametrized with variable strain and damage profiles based on B-spline functions. The strain and damage profiles can be graphically manipulated so as to fit the calculated curve to the experimental data. Automatic fitting procedures (generalized simulated annealing and conventional least-squares) are also implemented. RaDMaX is free and open-source (CeCILL license) and can be downloaded from: http://aboulle.github.io/RaDMaX.