Nasal breathing monitor
FLOU measures airflow at the nose. Nose or mouth, breath by breath, all night.
Free to join · No spam · Early access pricing
Why breathing
The last vital nobody measures.
VO2 max and HRV used to belong to sports labs. Now they're on your wrist. We believe breathing is next.
Breathe through your nose and the air arrives slowed, the exhale lengthens, the heart rate falls, and the body drops into the deep part of the night. Switch to your mouth and the whole sequence collapses. It's why you can wake with a 90 sleep score and still feel like you didn't sleep.
Most people do this most nights and never find out, because the only place breathing can actually be measured is at the nose, and nothing you own is anywhere near it.
FLOU sits where the air flows.
What it measures
Because the sensor sits at the source of the airflow, it measures breathing directly — not inferred from movement at your wrist. Tap any card to read more.
92%
of the night through the nose
The headline number. Almost everyone assumes they breathe through their nose all night — FLOU shows you the hours you didn't, the ones that leave you dry-mouthed and unrested. It is the number most likely to move once you start changing things.
2
events detected · Good
Your breathing doesn't run evenly through the night. It stalls, shallows, and restarts, and you sleep through every one of them. FLOU shows you when, how long, and what you were doing at the time.
78 ms
HRV · balanced
Heart-rate variability read against your breathing rhythm — the only way the number means anything. A wrist sees the beats, not the breath underneath them.
12 min
total snoring · Low
FLOU knows which side you were lying on when your breathing changed — so "sleep on your side" stops being generic advice and starts being a measurable result.
3.6 /min
average breath rate · deep
How fast you breathe, how deeply, and how the inhale divides against the exhale. Slow breathing with a long exhale is the signature of a nervous system that has stood down for the night.
FLOU app
The app tells you clearly how your night went. See trends over weeks, and learn what actually works for your body.
Excellent — well recovered
The difference
Because a wrist device infers your breathing from motion. FLOU measures it at the nose.
| Capability | FLOU | Wearables (e.g. smartwatches) | Nasal strip (mechanical) |
|---|---|---|---|
| Encourages nasal breathing mechanically Actively promotes nasal breathing while you sleep. | Yes | No | Yes |
| Breathing-regulated HRV Heart rate variability read against your breathing. | Yes | No | No |
| Nose vs. mouth breathing ratio Know how much you breathe through your nose vs. your mouth. | Yes | No | No |
| Positional breathing disturbance Detect breathing changes based on your sleeping position. | Yes | No | No |
| Breath-by-breath ratio Detailed nasal vs. mouth breathing for every single breath. | Yes | No | No |
Founders
Hardware · Product development
Aalto University, IT. Played futsal for Finland's U-19 national team, where the idea for FLOU started.
Software
Aalto University, Information Networks. Professional software developer since age 15, now building FLOU's app, algorithm, and user experience.
Strategy · Marketing
Law at Turku, engineering at Aalto. Years of coaching tennis taught him breathing decides the third set.
Early access
Join the waitlist for early-access pricing, launch updates, and a first look at what FLOU finds in your own nights.