Real astrological compatibility — synastry — is far more interesting and far kinder than matching two Sun signs against a chart on the internet.
Synastry, briefly
Synastry lays two birth charts over each other and reads the conversation between them. It looks at how your Moon meets their Mercury and how your Venus meets their Mars — the texture of relating, rather than a yes-or-no verdict.
Compatibility is not a score. It describes how two people tend to meet.
The healthier way to use it
Use synastry to understand a relationship, not to pre-judge one. Every pairing has easy aspects and hard ones; the hard ones are not automatic deal-breakers, they are the places that ask for more care and fewer assumptions.