Many people quietly assume that the best friendships are between people who are much alike, and wonder whether a friendship is on shaky ground when personalities clash. A recent study did not find that matching personalities predicted greater satisfaction between friends. That does not mean likeness never matters, and it says nothing about shared values or interests, which the study did not examine.
A news report published on 9 July 2026 described a study called "Friends' Personality Similarity and Its Association with Friendship Well-Being", which appeared in Social Psychological and Personality Science. The report did not say in which country or countries the participants were recruited.
The researchers gathered 371 groups of four friends, 1,484 people in total. The average age was about 19, roughly 78 per cent were female, and most people identified as White or Asian. The friendships had lasted about three and a half years on average. Data were collected online between spring 2023 and spring 2024, and muted group video calls were used to confirm that the people in each group really were connected.
The design is known as a round robin. Every participant scored themselves on the Big Five personality traits, scored each of the three friends in their group on the same traits, and reported how satisfied they felt in each of those friendships. The analysis allowed for the fact that every person belonged to several friendship pairs and to a group. This let the team compare how alike friends actually were, based on their own self-ratings, with how alike people believed their friends to be.
The central result was a null one: friends who were genuinely closer in personality, and friends who merely felt closer in personality, were no more satisfied with the friendship. In these data, the simple idea that friends are happier because their personalities match was not supported.
Friends did show small actual similarities on four of the five traits, strongest for openness. The correlations were roughly 0.05 to 0.10, which is modest. Extraversion showed no significant similarity. People also tended to see their friends as more like themselves than the friends' own self-ratings suggested.
Some other personality ratings were linked to satisfaction. People who rated themselves higher on agreeableness, conscientiousness, extraversion and emotional stability reported greater satisfaction, and viewing a friend as agreeable and conscientious went along with better friendship wellbeing. Those are links in the data. They do not show that any trait causes a good friendship, and they are not a reason to go looking for friends with a particular profile.
The study measured people at a single point in time. It cannot say whether similar people were drawn together, whether friends became more alike over the years, or whether similarity was simply unrelated to how the friendship felt.
The sample was mostly young, skewed towards women and drawn from tight friendships between people of the same gender. If you are older, in a mixed-gender friendship, or part of a different culture, the pattern could look different, and the study cannot tell you.
It also helps to be clear about the question being asked. The research looked at personality ratings only. Shared interests, values or cultural background are different things, and nothing here suggests they are unimportant. A friendship can contain both differences and common ground, and a finding about one measure should not be stretched to cover the rest.
One useful distinction is between "we are alike" and "I appreciate how this person treats me and engages with me". The findings make the second question worth asking without turning it into a checklist. For example, you may find that a friend's dependability counts for more than whether your temperaments line up, or that a hobby you share works well even though one of you is more outgoing. Such thoughts are for your own reflection; the researchers drew no conclusions about any individual friendship.
Nobody needs to go through their friendships ticking off matching traits. A gentle next step is to name something you value in a friend, along with one difference you like or are happy to live with. That can move the question from "are we alike?" to "what makes this connection meaningful to me?"
Source: Friends' Personality Similarity and Its Association with Friendship Well-Being DOI: 10.1177/19485506261450240
Illustration of friendship between people with different personalities. AI-generated editorial illustration. This article summarises published research in our own words and is general information, not personal health advice.
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