Expand. Find the belief that's running your life. Then test it.

Most self-help asks you to repeat a nicer sentence until it sticks. That isn't how minds change. They change when something you were sure would happen doesn't.

Expand is built around that moment. You name what the old belief predicts. You do one small thing that could prove it wrong. Then you look at what actually happened.

The old belief

If I share unfinished work, people will lose respect for me.

Sharing work early invites help, not judgment.

The old one made a prediction. The prediction failed. That's the whole method.

How it works

Three moves. One belief at a time.

Find the belief, write its rival, and put it in front of reality. Then do it again with whatever doubt is left.

An old belief struck through above its rival in Expand

1

Discover

A conversation, not a questionnaire. You bring whatever's bothering you and leave with the sentence underneath it, the one you've never said out loud.

Then you look at the evidence for it, piece by piece. Fact or interpretation? How old is it? Whose voice was that, originally? The case against you is usually thinner than it feels.
2

Flip

Write the rival belief. Not an affirmation. Something you could almost believe today. Expand pushes back on moonshots, because a belief that shatters on one lukewarm reply was never worth testing.

The new belief doesn't have to be proven yet. It has to be worth a test.
3

Test

Three experiments built around your life, each one concrete and doable within 24 hours. You write down what the old belief predicts, rate how sure you are, and go find out.

When the window closes, one question comes first: did the prediction come true? Rate it again, write what actually happened, and whatever doubt is left becomes the next experiment.

Before you start

The five minutes that make you actually do it

Deciding to do something and deciding when are different things. Every experiment begins with four small commitments.

Your safety move

Name the thing you'd normally do to make it feel safer. The disclaimer. The softening. The over-explaining. For this test, you drop it.

The prediction

Write what the old belief says will happen, in a form you could actually see. Then rate how likely it feels, 0 to 100. That number is the point. You'll rate it again after.

When, exactly

Tie the action to something that already happens. After lunch. When you close the laptop. The moment does the remembering, not you.

"When I finish lunch tomorrow, I'll share a rough draft in the team channel."

Rehearse

Read the plan once and picture the first physical step. Opening the chat. Typing the first line. In the research, that one moment is most of the difference between intending and doing.

Why it works

Borrowed from people who studied this for decades

Expand isn't therapy and doesn't pretend to be. But the method underneath it is the behavioural experiment: the core technique of cognitive behavioural therapy, and one of the most studied ideas in psychology. Three findings shaped the app.

The experiment changes the belief. The argument doesn't.

Talking yourself out of a belief rarely holds. Watching its prediction fail does. Every Expand experiment is built so the old belief has to make a call, and reality gets to answer.

Bennett-Levy and colleagues, Oxford Guide to Behavioural Experiments in Cognitive Therapy, 2004.

The gap is the lesson.

How much you learn depends on the distance between what you expected and what happened. That's why you rate the prediction before and after, and why Expand designs for surprise rather than difficulty.

Craske and colleagues on inhibitory learning and expectancy violation, Behaviour Research and Therapy, 2014.

Deciding when is half of doing.

People who set a specific cue for an action follow through far more often than people who merely intend to. The setup screen exists because of this.

Gollwitzer and Sheeran, meta-analysis of 94 studies on implementation intentions, 2006.

The research is about the method. Expand is a personal-growth tool that uses it. It doesn't treat, diagnose, or heal anything, and it isn't a substitute for a therapist.

Progress you can see

Every experiment moves something.

Seven ranks, earned by experiments run and days shown up in a row. Each belief has its own tracker, from Stone to Platinum. And the skills an experiment actually trained level up alongside it.

Wanderer

Scout

Explorer

Trailblazer

Pioneer

Mountaineer

Summiteer

Skills that come from doing, not reading.

When an experiment ends, Expand names the skills it trained. Vulnerability. Owning your needs. Full effort. Each one has a short description of what it actually means, and a ledger of the experiments that built it.

After you've worked a few beliefs, Expand checks whether one deeper belief sits underneath them all, and offers to help you look at it directly.

Stone to Platinum, per belief

The Vulnerability skill in Expand and the experiments that leveled it

Privacy

Your words stay yours.

This only works if you can be honest inside it. So the rules are short.

Everything you write is encrypted in transit and at rest, and locked to your account.
Your words go to our AI partner only to write your next reply. Never to train models. Never to anyone else.
No ads or third-party analytics in the app. No selling data.
Nobody on the Expand team reads your conversations. Not to improve the app, not to debug it.
Export everything as a PDF, or delete your account and every trace of it, anytime, from Settings.

You can skip the account entirely. Tap "Continue without an account" and run the whole thing. Add an email later if you want your progress to follow you to a new phone.

Some belief about yourself has never been tested.

Give it 24 hours.

Download on theApp Store

Free. iPhone, iOS 17 or later.

A gentle note. Expand is a tool for examining your own beliefs. It isn't therapy and doesn't treat, diagnose, or heal anything. If you're carrying something heavy, bring a human into it. In the US, the 988 Suicide & Crisis Lifeline is one call or text away, and findahelpline.com covers other countries.