Eddy current techniques are useful for the detection and the characterization of flaws in conductive structures. The flaw signal results from the measurement of the local punctual value of the perturbed magnetic field above the metal surface in the vicinity of the defect by using some magnetic field sensor (Giant Magneto Resistance sensor (GMR) or Giant Magnetic Impedance sensor (GMI). This paper aims to describe a semi-analytical numerical model integrated into the CIVA platform which is able to compute the flaw signal due to a given notch embedded in a planar stratified media. The inducer may be chosen in a list of available exciting coils into CIVA. Some numerical experiments and a comparison between simulated data and experimental data show the validity of the new developments.