An "all-in-one health app" should mean exactly what it says — not another single-purpose tracker with a broad name attached to it. ONU is not an app company chasing screen time, but a health-and-life-improvement company whose product happens to live on your phone (and, if you want the full experience, on your wrist). This page breaks down, plainly, what ONU actually does: what it connects to, what it measures, how it thinks, and what you get back.
The core idea
Aggregation with judgment, aimed at improvement
Plenty of apps can pull in data from a wearable. Very few use it to actively improve anything. ONU's product is built around a specific sequence, aimed at outcomes, not just visibility.
Connect
Link the health tools you already use (Apple Health, Whoop, Garmin, and effectively any device or platform that syncs into them) and, if you choose, upload lab results or medical documents.
Understand
ONU's AI health engine looks for patterns across everything connected, not just one metric in isolation.
Improve
You get a daily, personalized, evolving plan aimed at actually moving your numbers — better sleep, steadier stress, fewer preventable sick days — not a generic wellness checklist.
This is the difference between a dashboard — which shows you numbers — and a health-improvement account, which tells you what the numbers mean, what to do next, and keeps adjusting the plan as your data changes. See the full four-step process.
Device-agnostic
Built for your health, not our ecosystem
ONU isn't trying to be the one device that replaces everything you own. It's built to work with whatever you're already wearing.
Direct integrations cover Apple Health, Whoop, and Garmin, and because most other trackers and smart devices on the market — including many rings and other wearables — already sync their data into Apple Health or export it in a standard format, ONU can typically read and interpret that data as well, regardless of the original brand. In practice, that means switching from almost any competitor's device or app to ONU is meant to be simple: connect what you already have, and ONU gets to work immediately, no new hardware required to start.
What ONU tracks
What ONU actually tracks
Sleep
ONU reads sleep duration, consistency, and stage data from your connected wearable, folding it into your sleep score — with context on what's actually driving a bad night, not just a number telling you it was bad.
Recovery and heart signals
Resting heart rate and heart rate variability (HRV) are two of the most useful signals a wearable collects. ONU interprets both in the context of your trends, not a single day's reading.
Stress
Using heart rate patterns and, where available, connected wearable stress metrics, ONU tracks how your stress load moves through the day and the week — and flags when it's time to actually back off, not just when it's high.
Activity and fitness
Steps, workouts, and training load sync automatically from Garmin, Whoop, and Apple Health, so ONU can connect how hard you trained to how well you recovered, and adjust what it recommends next accordingly.
Labs and biomarkers
Upload bloodwork from your doctor, an employer wellness benefit, or an independent lab. The AI health engine reads the document, structures the data, and explains what each marker means alongside your other health signals.
Longevity indicators
ONU also surfaces longer-horizon signals like estimated biological age and cardiorespiratory fitness trends, framed as tools for tracking direction over time.
One number
The ONU Score: your health, in one number
Instead of asking you to interpret five separate charts every morning, ONU rolls your sleep, recovery, activity, and stress data into a single ONU Score — a fast, honest read on where you stand today, with the detail available underneath if you want to dig in.
In more detail
The categories in more detail
Sleep
Not reduced to a single duration number — ONU looks at consistency night to night, how efficiently you're actually sleeping during the time you're in bed, and how your stages compare to your own recent baseline, not a generic population average.
Recovery
Combines your resting heart rate trend with heart rate variability, read against your own history rather than a one-size-fits-all "good" number, since both metrics vary enormously between individuals.
Stress
Inferred from heart rate patterns through the day and, where available, your wearable's own stress metrics — giving you a rough sense of your stress load, and a specific suggestion when that load is building toward a problem.
Activity
Connects effort to outcome: how hard you trained relative to your baseline, how your body responded afterward, and what that means for tomorrow's plan — not just "workout logged" and nothing more.
Labs
Get the same continuity treatment — a single uploaded result is useful, but a series of results over time, read against your wearable trends from the same period, is where the real insight comes from.
FAQ
Frequently asked questions
The thinking layer
ONU AI Health Engine: the part that does the thinking
Underneath the score and the daily plan is ONU's AI health engine, trained on structured medical and wellness information and built specifically for health interpretation — not a general-purpose chatbot repurposed for health questions.
Learn more
More about the product
ACTION
Know it before it happens
ONU provides you with tools to build your healthy future; now it's your time to use them!