You don't need any software to compare gamut coverages

For what it's worth, you can get the three X-Y chromaticity coordinates from the monitor manufacturer and the three from the ink manufacturer and plot them on a plain X-Y coordinate graph paper. Connect the apex points with lines and compare/look at them directly. The two shapes will overlap. Parts that don't are out of gamut vis-a-vis the other. You can get design specifications for chromaticity coordinates from the manufacturers for any piece or gear or materials from sensors, dyes, inks, and what have you.

If you want, you can plot them on full-colour ICI Chromaticity Plot paper. They look really impressive.

RGB shapes are tri-angular as they have three apexes and CMYK shapes are trapezoidal as there are four apexes. There is one apex for each of the pigment axes.

This is not the same as a spectral emission density curve showing relative responses at different wavelength.