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 your breathing during sleep 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! Your nostril balance was optimal.
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 |
Founder
Founder · Hardware & Product Development
Lasse is the founder of FLOU and leads its hardware and product development. Studying Information Technology at Aalto University, he combines his technical background with a hands-on approach to building FLOU's wearable breathing technology.
From sensor electronics and embedded systems to product design, he is responsible for turning FLOU's vision into a working product.
Join us
We're building a new approach to understanding nighttime breathing through wearable technology.
FLOU is at an early stage, and we're always interested in connecting with ambitious people who want to help build something meaningful.
We're particularly interested in meeting potential co-founders and early team members with experience in:
Think you could be a good fit? Let's talk.
Get in touchFLOU is a nasal breathing monitor for sleep. A small sensor worn across the bridge of the nose measures airflow all night and shows, in the FLOU app, how much you breathed through your nose vs. your mouth, your breath gaps, snoring, sleeping position and breathing-regulated HRV.
Waking with a dry mouth, a sore throat or a partner who hears you snore are common signs, but they are indirect. FLOU measures it directly, breath by breath, and gives you a nose vs. mouth breathing ratio for every night.
Read the guide to mouth breathing while sleepingA watch or ring estimates breathing from movement and heart rate at the wrist or finger. FLOU measures the airflow itself, at the nose, so it can tell nose breathing from mouth breathing and read your HRV against your actual breathing rhythm.
See the comparisonYes. Because FLOU measures your nose vs. mouth breathing, snoring and breath gaps every night, you can compare nights with and without tape, or with a nasal strip or side sleeping, and see what actually changes.
What the research says about mouth tapingNo. FLOU is a wellness device. It is not intended to diagnose, treat, cure or prevent any disease. If you snore loudly, gasp at night or feel very sleepy during the day, talk to a doctor about sleep apnea.
FLOU is not on sale yet. Join the waitlist for early-access pricing and launch updates.
Join the waitlistEarly access
Join the waitlist for early-access pricing, launch updates, and a first look at what FLOU finds in your own nights.