How do I compare two Human Design charts?

You overlay the two BodyGraphs and read what happens channel by channel. Four dynamics can occur: electromagnetic, where each person holds one end of a channel and together they complete it; compromise, where one person has the whole channel and the other has one gate of it; dominance, where one has the full channel and the other has neither gate; and companionship, where both have exactly the same channel. Generate both charts and the connection reading lays these out for you.

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Electromagnetic channels are the ones people feel as chemistry — something switches on in both charts that neither has alone, which is compelling and also creates dependency, because it disappears when you're apart. Compromise channels are where friction concentrates: the person holding the full channel operates that theme consistently, while the person holding one gate only gets it when the other is present.

The other half of the comparison is the open centers. Wherever one person is defined and the other is open, the open one is being conditioned in that theme continuously — which is often what's actually happening when a relationship feels like it changes who you are.

Related Questions

Does Human Design say who I'm compatible with?
It describes the mechanics of a specific pairing rather than scoring it. Any combination can work; the chart tells you where the ease and the friction will sit.
What is an electromagnetic connection?
Each person carries one gate of the same channel, so the channel only completes when they're together — the classic attraction dynamic.
Do I need both birth times?
Yes, for the same reason a single chart does. Two approximate times produce a connection reading with the same uncertainty in it.