Compatibility sounds like a pass-fail result. Lay five cards out and what comes back is closer to a breakdown: here is what makes the two of you work, here is the thing you'll probably still be arguing about in five years. The breakdown is more use than the verdict.
The Compatibility spread runs You, Them, Strengths, Challenges, Future. Love compatibility is the obvious use, though the same five positions read fine for a friendship going through something, a business partnership, or a sibling. The extra two cards, over and above a three-card love reading, are the ones that show you where this breaks.

Your current state and feelings toward them
Their current state and feelings toward you
The strengths and positive aspects of your relationship
Challenges to overcome and points to note
The direction and possibilities of your relationship
Read Strengths and Challenges as a pair, every time. The risk in any compatibility tarot reading is taking comfort from the third card and waving the fourth away as something to watch out for. Those two usually turn up as one trait seen from opposite sides. The bluntness that lets you say hard things to each other is the bluntness that lands too hard on a bad night. I look for that correspondence first.
The moment a rough card hits Challenges, the conclusion drawn from it is instant: we were never compatible. Across the readings that come through here, the weight of that fourth card and how long a couple lasts barely track each other at all. The Tower has landed in Challenges for people fifteen years married and still going, and for people who were finished by the spring. What separates them tends to be whether they've already had their hands on the difficult thing. The set that actually gives me pause is five cards that come up mild and pleasant the whole way through. That usually means nobody has touched anything yet.
This is for the stage where you're genuinely deciding whether to keep going. Marriage has come into the conversation, someone mentioned moving in, you're three years deep and can't tell devotion from habit, you've had two good dates from an app and can't work out whether to invest. Five positions are about right when the decision carries consequences.
Too early, and it's heavy. Run Challenges and Future for someone you've met twice and there isn't enough material in the situation; the reading drifts toward generalities. At that stage the Relationship spread and its three cards — how they feel, how you feel, what's formed between you — is the honest tool.
If the question is which of two people to pursue, that's a different layout. The Crossroads spread puts Option A and Option B under identical conditions, which is what makes the comparison mean anything. And compatibility with an ex doesn't sit well here at all: the Future position assumes an ongoing relationship, so after a clean break it has nothing to stand on. The Reconciliation spread is built for that shape.
Two years together, marriage in the conversation, and one half of the couple pulled these five on her own without mentioning it to the other. Two queens turned up facing each other: Pentacles in her seat, practical, gets it done, and Cups in his.
Strengths said that difference was doing real work, each of them covering the other's gaps. Ordinary good news up to that point. Then Challenges turned over the same difference seen from the other side.
When the complement and the collision come out of one source, I always ask the same thing: has one of you been doing all the adjusting? Her answer came back straight away. She handled every plan, booking and deadline. He absorbed the moods and did the repair work after arguments. Neither of them had chosen that split; it had set like concrete. The Future card carried a condition inside it — the picture changes depending on whether they can name the arrangement and redraw it. For anyone weighing marriage, catching a fixed role division early is the most practical thing these five cards do.
Yes. Friends, a manager and a direct report, siblings, co-founders. The position names are You and Them, which keeps it neutral. Write the relationship into your question — "compatibility with the junior on my team" — and Mizuki Yuna reads it in that context.
Keep it on your own side of the line and you're on solid ground. These five positions describe the dynamic running between the two of you, and half of that dynamic is yours to look at. What goes on in their private life is a separate thing, and a spread is no way round simply asking them about it. Use what comes back to adjust how you handle the relationship. Produced later as evidence — I read the cards, and here's what you're really like — it goes badly every time.
No. That position shows where the relationship drifts if you both keep running it the way you're running it now, and the reason for the drift is usually sitting one card to its left, in Challenges. Plenty of people have gone to work on what that fourth card named and pulled a different Future a few months later. Nothing in five cards can settle a decision this size on your behalf.
If you only want to know how they feel right now, three cards will do. If you want to know what happens when this continues, take five. Strengths and Challenges are the difference; they're what you're still holding after the reading ends. Starting at three and moving up when it feels thin is a perfectly good way to work, and since neither one is metered, charged for, or behind an account, the only thing it costs you is the sitting.