The following app, is coded by MATLAB and designed by App Designer regarding the constraints addressed in CLT Handbook. The app works with any species and gives the optimized values for the top and bottom layer's and cross layer's thicknesses, considering that the CLT panel is fabricated with 3 layers of lamina that contains same thickness for 1st and 3rd layers (considering minimum value needed for fire safety) and a different thickness in the cross layers.