Compatibility matching explained: the 99-question model

“Compatibility matching” gets used loosely, so here’s what it actually means at Nonna — and why it beats judging a person from a photo in half a second. No mysticism, just the model.

Three dimensions that predict a relationship

Decades of relationship research point to a few things that actually predict whether two people last — and none of them are visible in a headshot. Nonna scores three:

• Values & relationship vision — what you want your life and a partnership to look like.
• Life foundations — the day-to-day realities of how you actually live.
• Personality & communication — how you relate, handle conflict, and connect.

Why a photo can’t tell you any of this

A swipe asks you to predict a relationship from a face in under a second. But attraction and compatibility are different variables. A photo can tell you whether you find someone attractive; it can't tell you whether they want kids, how they handle a bad week, whether they're a planner or a free spirit, or whether your day-to-day rhythms would actually mesh. Those are the things that determine whether a second date becomes a third — and none of them are visible in a headshot. Compatibility matching just measures the variables that actually predict the outcome you care about.

Why 99 questions?

Enough to be accurate, not so many you quit. Each question adds signal across those three dimensions, and — importantly — you can stop after the first section and your matches already work. The rest just sharpens your scores over time. It’s designed so a two-minute start is genuinely useful, not a bait-and-switch that demands an hour.

How the score is built

Nonna compares your answers against every other member and computes a compatibility score, weighting the dimensions that most predict a real fit. Then — the part swipe apps never give you — it shows you why you match: the specific places you overlap. A number with a reason behind it is worth infinitely more than a number alone. This is the engine behind our AI matchmaker.

What it’s not

Compatibility matching isn't astrology, and it isn't a personality test that sorts you into a box and leaves you there. It doesn't claim to predict love with certainty — nothing can. What it does is stack the deck: it filters the enormous field down to the people you're genuinely likely to click with, so your own judgment and chemistry get to work on good candidates instead of random ones. Think of it as a great matchmaker's intuition, made consistent and scaled to a whole city — not a fortune teller. You still choose; the model just makes sure you're choosing from the right shortlist.

See it for yourself

The fastest way to understand compatibility matching is to try it. Our free 2-minute compatibility check lets you test your score with a crush or friend — no signup needed — and it’s the same model that powers your matches on Nonna.

Create your free account and get matched on what actually matters.