How mood match works
The expression model gives each face seven scores: neutral, happy, sad, angry, fearful, disgusted and surprised. They add up to about 1. A big grin might read as 0.95 happy. A calm face might read as mostly neutral with a little sad.
The tool treats each set of seven scores as a direction and checks how closely the two directions point the same way. This is called cosine similarity. Two faces with the same mix of expressions score close to 100. Two very different mixes score low.
Mood match is 40% of the blend. The rest is proportion match (35%) and face resemblance (25%). The blend is then scaled to the 55 to 100 fun score.
Reading Expressions side by side
Expressions side by side shows the top three expressions the model saw on each face, with how strong each one was. It turns the mood match number into something you can check yourself.
If both faces show happy at the top, your mood match will be high. If one shows happy and the other shows neutral, it will be lower. Sometimes you will see something surprising, like a soft smile read as part neutral and part sad. That is the model guessing, and it is a good reminder that expression models are not mind readers.
Why a shared laugh scores higher
Photos taken at the same moment, during the same joke, tend to have the same expression mix. That is why a candid laughing photo often scores better than two posed selfies taken on different days.
It also explains why the score moves so much from photo to photo. Your faces do not change between Monday and Friday, but your expressions do. Mood match follows the moment, not the person.
- Real smiles that reach the eyes tend to read more clearly as happy than polite smiles.
- Dim light can make a calm face read as sad or fearful.
- A half-turned head can make the model less sure of the expression.
- Sunglasses and hands over the mouth hide the parts the model reads most.
The mood challenge: a game for two
Here is a simple game you can play in five minutes. You need two phones, or one phone and the One photo together input.
- Round 1, big smile: both of you smile at once. This one is easy, so it sets the bar.
- Round 2, surprise: both of you pull your most surprised face on a count of three.
- Round 3, neutral: the hardest one. Try to look as calm and blank as each other.
- Round 4, secret pick: one person picks an expression and hides it. The other has to guess and match it.
- Scoring: keep only the mood match number for each round. The highest round wins.
Tips when mood match is low
If mood match is under 70, the Why this number tips will say so and suggest what to change. Usually the fix is simple: retake both photos with the same expression, in the same light, facing the camera.
A low mood match is not a sign of anything. It just means the two faces were doing different things when the photos were taken. Each result also comes with ideas for your mode and match type. Same Wavelength means your moods matched even though your faces differ.
What mood match does not measure
Mood match compares expressions in two pictures. It does not know how you feel, how you feel about each other, or whether you get along. A face model reading "happy" is a guess about muscle shapes in a photo, not a reading of a feeling.
If you want the full method, including the exact formula, the how it works guide has every step. For photo tips beyond expressions, see the best photos to use guide.