If you want kundli matching scores
AstroSage and ProKerala offer thorough free Ashtakoota (Guna Milan) matching that scores two charts out of 36. They are the right tool if you want the classic compatibility number for an arranged-marriage context.
The limitation: a score tells you little about what the relationship actually feels like or what to do with it.
If you want to talk to a person
Astroyogi and AstroTalk connect you to a live astrologer who can discuss your relationship by chat or call. That human reassurance matters to a lot of people.
The trade-off is per-minute pricing and quality that varies by the individual astrologer.
If you want to understand your pattern in love
Stellr reads your Venus, 7th house, Moon and relevant dashas and answers in plain English: what you are drawn to, where it gets difficult, and what the healthiest next step is. You can ask follow-ups like "why do I keep attracting unavailable people."
It is private, instant, and does not require you to decode a chart or book a call. It is best when you want insight and direction rather than a score or a consultation.