Can an app change your personality? What the trial found

Can an app change your personality?

The best evidence for a yes is one randomised controlled trial. Researchers tested a three-month, smartphone-based personality change programme against a waitlist control in 1,523 participants, and the people who used it changed more, in the direction they had chosen, than those who waited (Stieger et al., 2021), a controlled result rather than a before-and-after story people told about themselves. It sits inside an older literature that already said personality could move with sustained effort; a phone mainly adds delivery, reminders and prompts on a timescale a person can keep up.

What did the trial actually test, and what did it find?

Run through a smartphone app called PEACH, the study let each participant choose one Big Five trait to change, then followed a three-month digital coaching programme built around it: short prompts, small suggested actions, and check-ins. Participants were randomly assigned to start immediately or to a waitlist, and both self-reports and reports from someone who knew them well were collected before and after (Stieger et al., 2021). The waitlist rules out people changing anyway from filling in questionnaires twice, and the observer report rules out participants simply saying what they hoped was true.

On self-reports, people raising a trait moved about d = 0.52 in that direction relative to the waitlist group, and people lowering a trait moved about d = -0.58 (Stieger et al., 2021), a group average rather than a promise for any one person. Observers picked up the change too, but only one way: friends and family detected a significant shift for those raising a trait, at about d = 0.35, while the equivalent effect for lowering a trait was not statistically significant, at about d = -0.22. Both self- and observer-reported changes were still present three months after the programme ended, separating a real shift from a mood that faded once the prompts stopped.

How does this fit the wider evidence on personality change?

It agrees with the older literature rather than overturning it. A systematic review of 207 intervention studies found trait measures moving by about a third of a standard deviation over roughly six months, largest for Emotional Stability, and drawn mostly from therapy and counselling trials (Roberts et al., 2017), a smaller effect over a longer period than the app trial, plausible since the app targeted one chosen trait rather than a general course of treatment. It also matches an earlier finding: across two 16-week studies, people who said at the start they wanted to change a trait tended to show measured change in that direction, and a specific if-then plan helped more than a general intention (Hudson & Fraley, 2015), the same starting condition the app trial's participants shared. Traits predict real outcomes across education, work, relationships and health, so if they can also be nudged, researchers now argue they are worth treating as targets rather than only fixed facts about a person (Bleidorn et al., 2019).

What is the mechanism? Why would an app move a trait at all?

A trait is the average of thousands of small, repeated moments, not one big decision. A phone can reach exactly that level, a short prompt at a predictable time, a small suggested action, a place to note whether it happened, none of which needs one dramatic sitting of insight or willpower, only repetition. There is direct evidence that acting differently changes how a moment feels: in a study where participants reported their behaviour and mood every few hours for two weeks, each person felt happier in their own moments of acting more extraverted than in their own moments of acting less so, and the effect held even when the behaviour was assigned experimentally rather than chosen (Fleeson et al., 2002). A programme built to prompt that action repeatedly has a real reason to work.

What are the limits of this evidence?

The 1,523 participants had already chosen a trait they wanted to change, so this is evidence about people willing to try, not about anyone who happens to open an app. The sizes, while real, are modest: the trial's self-report effects of about half a standard deviation move the average person a noticeable distance along the same scale, not from one end to the other, and say nothing about any one person's own result. The effect also ran one way for observers, confirmed for people raising a trait but not, reliably, for people lowering one, and three months of follow-up is not the same claim as permanent change.

How does the Wellington Membership relate to this evidence?

Wellington is a science-based personality assessment from Therabot Labs LLC. It measures personality as continuous traits, built on the Big Five and HEXACO models, and writes the results back as a personal report rather than a type.

The free Snapshot is where that starts: 60 questions, scoring 6 broad dimensions, Extraversion, Agreeableness, Conscientiousness, Emotional Stability, Openness to Experience and Honesty-Humility. Every trait is reported as a percentile against the reference sample. The three bands (Quiet below the 30th percentile, Balanced to the 70th, High above) and the Portrait names exist to make the result easier to talk about; the percentile is the measurement, and it is always shown alongside. Norms are provisional. The first ten questions are answered before anything is asked; after question ten you sign in with an email so answers are saved and results can be shown. No card is involved.

Change is where the Wellington Membership points. The membership turns your lowest bands into named growth edges, each with a small, specific practice, the kind of concrete step the evidence above favours over a general intention. It is $4.99 a month, and adds one short weekly module at a time across 104 weeks toward all 255 traits, retesting the earliest traits in year two. That describes what the product does, not a claim that the membership has been through a trial like the one above.

For the broader evidence on whether personality changes at all, see can personality change, and for an app against a therapist, see can counselling change personality. Wellington is a wellness tool for reflection, not a medical or psychological diagnosis, and it does not replace care from a qualified professional. Wellington is not designed for hiring, and you can export or delete your data at any time.

Questions people ask

Does this trial prove that an app can change anyone's personality?

It shows that motivated volunteers who chose a trait to change did change more than a waitlist control group, with friends confirming the shift for those raising a trait (Stieger et al., 2021). It does not show that opening an app without that motivation produces the same result.

What app was used in the study, and is it the same as Wellington?

The trial used a smartphone app called PEACH, built to run that programme. It is a separate product from Wellington, a personality assessment and reporting tool, though the Wellington Membership does add weekly practices aimed at the traits it measures.

Can an app change your personality permanently?

The trial followed people for three months after the programme ended, and the change held up over that window for both self-reports and observer reports (Stieger et al., 2021). That is real staying power for the period measured, not evidence of a permanent change.

Do you need to want to change for an app to help?

Wanting it matters. Across two 16-week studies, people who set out wanting to change a trait tended to show measured change in that direction, and a specific plan helped more than a general wish (Hudson & Fraley, 2015). The app trial's participants had already made that choice.