If you have a Windows based computer - consider downloading this Free Software Jagannatha Hora
https://vedicastrologer.org/jh/jh_full_install.zipPerfectly safe and widely used for its accuracy. The author is PVR Narasimha Rao - an astrologer, accomplished yogi.
This works if you looking for computing the chart, also supports the overall Ashta Koota compatibility score - for marital compatibility
if you know the nakshatra for Girl & Boy
Hope this helps
Shrikanth