In this manuscript an algorithm based on a graphic user interface (GUI) designed in MATLAB for an
automatic phase-shifting estimation between two digitalized interferograms is presented. The
proposed algorithm finds the midpoint locus of the dark and bright interference fringes in two
skeletonized fringe patterns and relates their displacements with the corresponding phase-shift. In
order to demonstrate the usefulness of the proposed GUI, its application to simulated and
experimental interference patterns will be shown. The viability of this GUI makes it a helpful and
easy-to-use computational tool for educational or research purposes in optical phenomena for
undergraduate or graduate studies in the field of physics.