Helping you see the patterns behind unpredictable days.
PHIT learns from your daily check-ins and surfaces the patterns behind your best and worst days - so you can anticipate, pace, and understand your body rather than be constantly caught out by it.
If you live with fluctuating health, you already know what unpredictable days feel like. What's harder to see is why they happen - and whether there's a pattern that, once recognised, you could work with rather than simply endure.
PHIT is a personalised health insight tracker. It takes your daily check-ins - symptoms, sleep, wearable data, activities, cycle phase, nutrition context - and surfaces the patterns that connect your best and worst days.
It doesn't diagnose. It doesn't prescribe. It gives you the kind of insight that usually only emerges after months of working with a skilled practitioner - and makes it available every morning.
PHIT also addresses one of the more frustrating experiences of wearable health tracking: the readiness score that says "go" when the body is clearly saying "no." Most tracking algorithms were built on healthy populations - they weren't designed for bodies where HRV, sleep score, and lived experience routinely disagree. PHIT cross-references your wearable data with your check-in responses, and when they conflict, it names that conflict rather than trusting the device over the person. "Wearable Mismatch" is one of the most consistently identified patterns in our early data.
PHIT runs on a simple daily loop - set up once, then two short check-ins a day produce a diary entry that grows richer the longer you use it.
PHIT asks about your symptom profile, functional baseline, current medications and supplements, wearables and data you already track, interventions and therapies, and hormonal or cycle context.
Your check-in is built from your answers - so the questions you see each day are the ones that matter for your body, not someone else's.
Two check-ins, 1-2 minutes each. Morning captures overnight recovery - how you slept, how symptoms feel on waking, what your wearables recorded. Evening captures the day - what happened, how symptoms moved, what interventions or activities occurred.
Cycle tracking, nutrition context, and vasomotor symptoms (for peri-menopausal profiles) are all optional additions that enrich the pattern picture over time.
Your diary entry is generated from your check-ins. During the trial, it arrives the morning after your evening check-in. Once the PHIT app is built, it will be generated within moments of submitting your evening check-in. It shows what happened, what patterns are emerging, and a gentle suggestion for today - framed as support, not instruction.
Choose a simple overview for hard days, or tap into the detail when you have the capacity. The week and month views show patterns as they build across time.
On a difficult day, the diary gives you one sentence, one visual, and one suggestion. On a better day, every data point is a tap away.
How much the body had available at the end of the day - energy, cognitive clarity, emotional bandwidth, and physical readiness combined. Calculated from your morning and evening check-in scores: capacity ratings and symptom responses together. A full battery means good reserve. Low means very little was left.
What was asked of the body - physical, cognitive, emotional, and social demand combined. Calculated from your check-in responses about activities, overlays, and symptom patterns across the day. The speedometer colour shows whether load was within reserve. A high needle in green means high load was managed. The same needle in red means reserve was insufficient.
Whether capacity improved (↗ green), held steady (→ grey), or declined (↘ red) from morning to evening. A green arrow on a difficult day means things moved in the right direction despite a hard start. A red arrow on a stable day is worth noticing.
Each day is classified into one of eight primary states - a plain-English summary of what the body was doing and why. States appear in your diary as a colour, not a label, to avoid over-interpretation on difficult days.
The body is managing well. Energy, cognition, and emotional bandwidth are all holding. Demands are being absorbed without a delayed cost.
Inflammatory signals are present but capacity is not yet significantly impaired. A decision-point day - it can go either way depending on what happens next.
The immune system is actively engaged, reducing functional capacity. Fatigue is often disproportionate to activity. Containment, not pushing through.
Capacity has been exceeded. Crash Days rarely come from what happened that day - they usually reflect accumulated load arriving all at once.
Moving out of a difficult phase, but reserves are not yet rebuilt. Capacity may feel like it's returning before resilience is fully restored.
Reserves have been exhausted by accumulated demand, not active inflammation. Often follows load-stacking days, cognitive-heavy periods, or early starts.
Capacity is primarily shaped by cycle phase or vasomotor activity. Resolution comes with the phase shift. These days become predictable over time.
The autonomic nervous system is under significant load - palpitations, heat sensitivity, dizziness. Often appears alongside hormonal fluctuation.
PHIT identifies patterns across eight categories - each capturing a different dimension of how the body manages load, recovery, and fluctuation over time.
When a pattern appears for the second time, PHIT notes it. By the third or fourth appearance, it's named as established. Over weeks and months, the pattern picture builds into something genuinely useful - not just data, but understanding.
How the body builds, spends, and loses reserve - and why crashes often arrive from yesterday, not today.
How the immune system responds to load, phase, or cumulative demand.
How the autonomic nervous system responds to hormonal change, load, and disrupted repair.
How overnight repair is supported or disrupted, and how disrupted sleep translates into next-day capacity.
How cycle phase shapes capacity, immune reactivity, and recovery - and how these patterns become predictable.
How cognitive load and emotional signals contribute to depletion - and how emotional fragility often precedes physical escalation.
How the body responds to specific interventions, protective choices, and recovery-supporting actions.
How nutritional context correlates with capacity and recovery - as a pattern to track, not a prescription to follow.
PHIT is designed for anyone navigating fluctuating, unpredictable health - where standard tracking tools show you data without explaining what it means.
PHIT works across all fluctuating health conditions. The two profiles in the demo illustrate common examples - but the framework adapts to your symptom profile, not the other way around.
Long COVID, ME/CFS, post-viral fatigue - conditions where post-exertional fatigue and unpredictable capacity are central.
Where hormonal fluctuation creates unpredictable capacity shifts that standard health apps don't account for.
Fibromyalgia, autoimmune conditions, chronic inflammation - where immune reactivity shapes daily capacity in ways that aren't always predictable.
Where the nervous system is under sustained load and recovery is slower and less predictable than it should be.
If you're already logging symptoms or wearing a tracker, PHIT connects those data points to the patterns behind your days.
PHIT is designed to work alongside practitioners - sharing pattern data in a form that is genuinely useful in clinical conversations.
PHIT is designed to support the practitioner-participant relationship, not replace it. Practitioners receive the insight diary and pattern summaries - in a form that is genuinely useful in clinical conversations, not a wall of raw data.
Participants control what is shared and when. Data sharing is opt-in and explicit, not automatic.
PHIT is currently in MVP trial with a small group of practitioners and self-referred participants. If you work with people navigating fluctuating health conditions and are interested in collaborating, we'd love to hear from you.
Get in touchPHIT is currently in a small MVP trial. Participants check in daily, receive their insight diary, and provide feedback that shapes what PHIT becomes.
Participation involves: two short daily check-ins (morning and evening), access to your personalised insight diary, and occasional feedback on your experience. You can participate with or without a practitioner.
Tell us a bit about yourself and we'll be in touch.
PHIT is built on a simple principle: your health data belongs to you. We collect what's needed to make PHIT work, and nothing else.
Data is stored securely. We take storage and access seriously.
PHIT products are ad-free. We do not sell, share, or monetise your health data.
Sharing with practitioners is opt-in and explicit. Nothing is shared automatically.
Privacy questions? hello@phit.nz
PHIT was built because the tool didn't exist. Living with a fluctuating health condition means navigating days that don't make sense without the context that patterns provide - and most health tracking tools give you data without giving you understanding.
One specific frustration: the wearable showing a readiness score of 90 on a day when getting off the sofa is genuinely difficult. The Garmin says "go." The body says otherwise. Most apps believe the Garmin. PHIT was built to take both seriously - and to explain the gap rather than ignore it.
PHIT Intelligence is based in New Zealand. The MVP trial is running now, with plans to expand in 2026.
Whether you're interested in participating in the trial, want to explore PHIT for your practice, or just want to know more - we'd love to hear from you.
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