Java foil can do this. It shows V/v on cursos. Or pressure ratio..Note that plots in TOWS App I are for Cl= 0 and some low Cl. That is fine as far as it goes, but at max g as seen at Va, Vd, and between, Cl are much higher. The (V/v)^2 plot for higher Cl may be estimated by extrapolating. Much higher local V^2 can occur over the upper surface then, particularly forward of the spar.