The Larch Check

Brain health, measured in movement.

The Larch Check takes two minutes on your phone or computer, and it only compares you against yourself.

Most of the time, Larch will tell you everything looks as it should. That's the point of a routine check. And if something does change, you will know while there is still time to do something about it.

Get in touch How it works

If we delay the onset of dementia by five years, we halve the number of people living with it.

But we can't delay what we can't detect.

Lancet Commission on dementia prevention, intervention and care

The window

Brain change begins years before symptoms appear.

By the time symptoms show, the window for meaningful intervention has already narrowed. The earliest signs appear in the preclinical stage, in changes to how a person moves that are too subtle for them, or anyone around them, to notice.

Stage durations adapted from Jack et al., Lancet Neurology.

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Why movement

The first signs of brain change are in how you move.

Motor control is among the earliest systems to change. Long before memory falters, timing does.

  • TimingA few milliseconds added to a tap
  • TremorA tremor below the threshold of sight
  • SpeechA hesitation in speech too brief to hear

Signals no clinical eye can catch, but every modern phone can.

Two minutes

On a phone or computer people already own, in the clinic or at home. No extra equipment.

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Millisecond precision

Motor, speech and cognitive signals, timed beyond what any human sense registers.

A personal baseline

Each result reads against that person's own history, so the second check says more than the first.

How Larch works

One assessment, four moments.

  1. Baseline 01.

    Check

    A routine two-minute check that sets your starting point.

  2. Direction 02.

    Triage

    The closer look when something changes.

  3. Risk profile 03.

    Detect

    The answer, years before symptoms.

  4. Trajectory 04.

    Monitor

    The ongoing record of change.

The record starts at the first check and never restarts.

Larch

Brain health, measured in movement

Who it's for

See brain change while there's still time to act.

For clinicians

A measurable sign, before there's a symptom to report.

Early brain change usually reaches you second-hand. A patient mentions dropping things, or a family member notices a shuffle, and the history depends on who noticed and when they thought to say it.

Larch picks up changes in movement during the preclinical stage, when they are too subtle to see. After the first reading, each result is compared with the patient's own earlier ones, so you can see whether anything has moved and by how much.

It fits inside a standard consult and needs no extra equipment. The next reading can be done at home before the follow-up.

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For investors & partners

A brain health measure that gets more useful each time it's repeated.

Most cognitive assessment still happens in a clinic, once someone is already worried. Larch runs on phones and computers people already own, so another reading costs almost nothing to deliver and repeat use is the expected pattern.

Every reading adds to that person's baseline. Over years, that record is what makes a small change visible. It also builds a longitudinal movement dataset that would be slow and expensive for anyone else to copy.

The same motor tasks apply across dementia, Parkinson's, MS and MND, giving one platform several clinical pathways and routes to partnership or licensing.

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For you

Check your brain health in two minutes.

Use your own phone or computer. Your first check sets your baseline, and after that Larch compares you only with you, so you always know where you stand.

Most years, for most people, the result is that nothing has changed, and you get on with your year.

If something has changed, you'll know early, while more options are open to you. Your readings can inform your next move, starting with a conversation with your GP.

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Built on evidence

Years of research, thousands of people.

Larch is built on clinical research into how hand movement tracks cognitive change, developed with older adults across community studies and memory clinics.

Read the science
4,000+people assessed
14,000+assessments completed
5 yearsof longitudinal data
10study cohorts in 4 countries
Meet our team

Proven, and ready to scale.

A/Prof. Jane Alty

Founder & Director

Neurologist, and the researcher behind the method Larch is built on. She led the study that showed hand movement tracks cognitive change years before symptoms appear.

David Bartlett

CEO

Computer scientist, then Premier of Tasmania, then technology chair. He has been inside the governments that buy health technology and the companies that sell it.

Dr Anabela Correia

Founder & Director

Healthcare venture builder and investor. She has taken diagnostics through regulatory approval and into global markets, and built the teams that sold them.

Ms Charissa Bensted

Founder & Director

Leads commercialisation and enterprise creation at the University of Tasmania. She has taken research out of the university before, which is the step most discoveries never make.

Get in touch

Let's talk about what Larch could do for you.

Whether you're a clinician, researcher, investor or potential partner, or simply want to know when the Larch Check is available, we'd like to hear from you.

Prefer email? hello@larch.health

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