Now on the App Store · iOS + Apple Watch

The first signal is the quietest.

BioTrax Sense is a passive mental health monitoring app for iPhone and Apple Watch.

The first signal that something is wrong is almost always the quietest — a shift in sleep, a rise in stress, a slow withdrawal from the people around you. BioTrax Sense catches these signals before they become a crisis, passively and in the background, with no journaling or check-ins required.

Free pre-release · Available in Sweden only · First 45 days

Four quiet signals. No journaling required.

Apple Watch and Screen Time API do the work in the background. You just live your day. BioTrax monitors the quietest physiological and behavioural signals — the ones clinical research shows shift first, before you even notice something is off.

Sleep architecture, scored.

Total sleep time, efficiency, continuity, and breathing rate — scored every night. Below 5 hours or above 10 hours, BioTrax surfaces a quiet check-in. Poor sleep is often the first signal of nervous system overload.

Stress, watched all day.

Continuous heart rate variability (HRV) monitoring from the Apple Watch — the most studied physiological signal of nervous system load and stress resilience. HRV drops are among the quietest early indicators of burnout, anxiety, and emotional exhaustion.

Time at home, watched gently.

A 72-hour rolling window of consecutive home stay. Social isolation is a reliable predictor of declining mental health. BioTrax tracks it subtly, never punitively — just watching for the pattern.

Communication vs. doomscroll.

Active communication minutes versus passive social media consumption — the cleanest signal of social withdrawal. When someone stops reaching out and starts scrolling, that quiet shift matters.

Set it once. It does the rest.

Getting started with BioTrax Sense takes less than five minutes. After that, it runs silently in the background.

Step 1: Pair your Apple Watch

BioTrax reads HealthKit data — heart rate, HRV, sleep stages — passively. No extra sensors, no wearable beyond what you already own, and no manual data entry.

Step 2: Set your baseline

The first week calibrates your personal normal. After that, every shift is measured against your own baseline — not a population average. This is what makes the signals meaningful.

Step 3: Add someone you trust

One tap invites a partner, friend, or clinician as your safety net. They see trends, not raw data — and only when something drifts outside your normal range. No surveillance, no drama. Just the earliest possible signal, to the right person.

Better with someone in your corner.

BioTrax can stay just yours. When you're ready, one tap invites someone you trust — a partner, a friend, a clinician — to act as your safety net. Same app, companion profile. They see only what you've chosen to share. The quietest signal reaches the right person at the right time.

Frequently Asked Questions

What is BioTrax Sense?

BioTrax Sense is a passive mental health early-warning system for iPhone and Apple Watch. It monitors sleep, stress, isolation, and social connection in the background — no journaling, no check-ins — and can alert someone you trust when your patterns drift.

How does BioTrax detect the first signs of a problem?

BioTrax builds a personal baseline during your first week. After that, it watches for quiet shifts — a drop in HRV, disrupted sleep architecture, increased time at home, reduced communication. These are the signals that clinical research shows change first, often before you feel anything yourself.

Is my health data private?

Yes. All biometric data stays on your device and is encrypted end-to-end. BioTrax never sells data, never shares it with insurers, and never uses it for advertising. You control exactly what your companion contact can see.

What devices do I need?

BioTrax Sense requires an iPhone running iOS 17 or later and an Apple Watch Series 6 or newer. The Apple Watch provides the continuous biometric data — heart rate, HRV, and sleep stages — that powers the monitoring.

Is BioTrax Sense free?

BioTrax Sense is currently available as a free pre-release in Sweden for the first 45 days. No credit card required, no commitment. Download it from the App Store today.

Who is BioTrax for?

BioTrax is for anyone who wants an objective, passive window into their mental and physical wellbeing — and for the people who care about them. It is especially useful for people in recovery, those managing chronic stress, and anyone who wants an early-warning system that works quietly in the background.

Download BioTrax Sense

Early access is opening soon. The first signal is always the quietest — catch it before it becomes a crisis.

Free pre-release available in Sweden. iPhone and Apple Watch required.