This site's compatibility (궁합) checker gives you a real reading, built from real chart data — but it's worth being upfront about exactly what it's doing, and what it isn't, since 궁합 is one of the most commercialized, most oversold corners of Saju practice.
Here's what it actually computes. First, your Day Masters' relationship: using the same Ten Gods logic that powers your individual reading, it works out whether your Day Master elements are peers, whether one generates the other, or whether one challenges the other — the same 相生/相剋 cycles the elements article above walks through. Second, your zodiac-year relationship: whether your year branches land in a 삼합 trine, a 육합 six-harmony pair, a 충 clash, or no classical pairing at all. Third, a simple element-complement check: whether either person's Day Master element happens to be exactly what the other's chart runs short on.
That's a real, three-layer reading — but it's also a deliberately narrow slice of what a full traditional 궁합 consultation would examine. A thorough reading typically weighs the day branches specifically (일지궁합), which many practitioners treat as more decisive than the year branch this site uses; it looks at how each person's current and upcoming 대운 (luck decade) lines up with the other's; and it considers the full eight-character interaction, not just the Day Master pair. This site keeps to the layers it can compute with real confidence and explain plainly, rather than reaching for a fuller reading it can't back up with the same rigor.
It's also worth saying clearly: no version of 궁합, done well or done badly, tells you whether a relationship will work. What it can do, at its best, is name real dynamics that are often easier to talk about once they have a label — a 충 pairing naming the friction you'd already noticed, a 육합 pairing naming the ease neither of you had quite put into words. That's the actual, modest value of a compatibility reading: vocabulary and reflection, not prediction.
If you and someone else run this together and don't love what it says, that's genuinely fine to ignore — this reading, like the individual one, is built to be a mirror you can pick up or put down, not a verdict handed to you from outside.