The face shape compatibility myth
Many posts and apps claim your face shape reveals your personality, or that certain shapes are made for each other. This is a form of physiognomy, the old idea that you can read character from a face. It has a long history and no good support. Faces vary for many reasons, and none of them map neatly onto personality or love.
So we do not do that. The tool does not label faces as round, oval or square. It does not say what a face means. It only compares the same five measurements on two faces and tells you how close they are.
The five ratios we measure
The face model places 68 landmark points around the jaw, brows, eyes, nose and mouth. From those points we work out five ratios. Ratios are used instead of raw sizes, so a close-up and a wide shot of the same face give similar numbers.
- Face shape: face width divided by face height, from brow line to chin.
- Eye spacing: the distance between the eye centres divided by face width.
- Nose length: from the bridge to the tip, divided by face height.
- Mouth width: from corner to corner, divided by face width.
- Eyes to mouth: the distance from the eyes down to the mouth, divided by face height.
From five ratios to one proportion match
For each ratio, the tool works out the relative gap between the two faces. Then it averages the five gaps. Proportion match is 100 minus that average times 250, kept between 0 and 100. So an average gap of 4% gives 90, an average gap of 10% gives 75, and a gap of 40% or more gives 0.
Proportion match is 35% of the fun score blend. Mood match is 40% and face resemblance is 25%. The blend is then scaled to 55 to 100.
Reading the Feature by feature bars
The result shows one bar for each of the five ratios. The tool names the closest feature and the most different one, with how far apart they are. For example, "face shape 1% apart" means the width-to-height ratios of the two faces are nearly the same.
The most different feature is often the mouth. That is not because of the face itself. It is because one person smiled more. A smile widens the mouth and can shorten the eyes-to-mouth distance. If you want a pure look at proportions, use two neutral faces.
What changes the ratios (that is not your face)
Ratios from a single photo are sensitive. The same person can get quite different numbers in two photos. Here is what moves them most:
- Head turn: a face turned to the side looks narrower, which changes face shape and eye spacing.
- Tilting up or down: changes the height ratios, such as nose length and eyes to mouth.
- Expression: smiling widens the mouth and lifts the cheeks.
- Lens and distance: phone cameras held very close can make the nose look bigger.
- Filters: face-reshaping filters change the landmarks directly.
Similar proportions are a fun fact, not a match
Two faces with close ratios have something in common in how their features are spaced. That is all. It does not mean you suit each other, think alike or will get along. Two faces with very different ratios are just as likely to belong to a happy couple.
Treat the bars like a game of spot the difference. Which feature is closest? Which is furthest? Does it change when you both smile? For the rest of the method, see how it works. If you are curious about whether couples really look alike, the do couples look alike page covers the research.