SonuCheck — Nasal Breathing, Measured
Your Voice. Your Breath. Your Health.

Nasal breathing
is the foundation
of health.

Why it matters
Breathing through your nose — not your mouth — is the single most impactful thing you do for your respiratory health every day. Your nasal passages deliver oxygen more efficiently and flood your lungs with protective nitric oxide produced nowhere else in the body. When congestion blocks that pathway, you lose both.

SONUCheck measures your nasal airflow from one sentence — in under three seconds. Know where you stand. Track your improvement. See it change.

87
NCS Score
97%
eIO₂ Oxygen
72%
eNO Delivery
89
NFI Voice Score
<3 sec per reading before & after in <7 sec
Download the SONU app to try SONUCheck for free Track with SONU
How SONUCheck works

One sentence.
Under three seconds.

Say "Man simmers on the moon." Five nasal consonants, six syllables. Your score is ready before you finish reading it.

voice analysis · real time
The sentence engineered to measure your nose
"Man simmers on the moon."
MAN
M + N = two nasal consonants
SIM
Bilabial M — needs nasal airflow
-mers
ON
Sustained nasal resonance
the
MOO
Peak measurement window
N
Final airflow reading point
Nasal — measured for airflow
Oral — acoustic baseline
Five nasal consonants — M, M, N, M, N — packed into under 3 seconds. Clear passages resonate richly; congestion muffles them. SONUCheck measures this (called nasalance) against your personal baseline, Nasalance has been widely validated as a measure of nasal resonance in clinical settings (Fletcher, 1976; Vogel et al., 2009).
Vogel et al., 2009 · Fletcher, 1976
What happens between "Man" and your score
🎙
Step 1
You speak
Voice capture
Read the sentence. Done in under 3 seconds. No hardware needed.
📊
Step 2
AI listens
Resonance analysis
Each nasal phoneme is measured for spectral energy → your Nasal Flow Index (NFI), 1–100.
👆
Step 3
You rate
Congestion check
One tap: how blocked does your nose feel? FDA-validated TNSS scale. Under 1 second.
✦
Step 4
Scores fuse
Your personal NCS
Voice + perceived congestion, weighted by what's most reliable for you. Refines monthly.
The habit that compounds

Think of it as a CGM
for your nose.

⌚
Step Counter

Movement, visible

A step count turns invisible effort into a number you act on. Measurement changes behavior — you take the stairs, you park further away. The data is the intervention.

🩸
Glucose Monitor

Biology, real time

A CGM shows how food and stress affect blood sugar continuously. Seeing a spike after a meal you thought was healthy changes your next choice. Feedback loops create lasting change.

👃
SONUCheck

Nasal airflow, in seconds

One sentence. You see your patency score — and watch them shift over time. Not abstract. Yours.

The case for nasal breathing

Your nose does far more
than filter air.

10–20%
More oxygen, nasally
Nasal resistance creates gentle back-pressure that keeps alveoli open and improves gas exchange — something mouth breathing cannot replicate.
1,100
ppb NO
Nitric oxide from your sinuses
Your paranasal sinuses make more nitric oxide than anywhere else in the body — and only nasal breathing delivers it to your lungs.
🫁
Oxygen (O₂) — the efficiency story
Nasal breathing acts like a pressure valve — keeping tiny air sacs open, boosting oxygen uptake by 10–20%. Congestion removes that valve.
🧬
Nitric Oxide (NO) — your body's first defense
Your sinuses produce 200–1,100 ppb of NO every minute. Nasal breathing sweeps it to your lungs to dilate vessels and kill pathogens. Congestion seals the sinus openings — trapping it inside.
eNO · 0–100%
The check-in protocol

Before. After.
Every SONU treatment session.

A voice check immediately before treatment and immediately after. Two data points that make your results visible — and your habit stick.

<7s

The full before & after routine takes under 7 seconds.

Two sentences. Two taps. A complete picture of your nasal airway before and after treatment.

Before: <3 seconds
After: <3 seconds
Congestion tap: ~1 second each
1

Before treatment

Read the sentence and tap your congestion level — under 3 seconds. Captures your pre-treatment nasal patency.

📊 Baseline NCS
Acoustic treatment
2

After treatment

Read the same sentence again — under 3 seconds. SONUCheck computes the delta: your NCS. Objective proof your treatment opened your airway.

✦ Post-treatment NCS
📈
See your progress
The before/after delta is objective proof your treatment is working — session by session.
🔁
Build the habit
7 seconds twice a day. The act of measuring anchors the behavior. Measurement is the intervention.
🧠
Smarter over time
Every check-in trains your personal model. It takes 3 samples to establish your baseline and subsequent scores are calibrated uniquely to you as the algorithm gets smarter over time.
SONUCheck is optional. Opt-in or out anytime from the app under Account → Assessment Preferences. Your device continues normally. Your baseline data is always preserved.
Try it

Drag to explore your NCS

Watch oxygen and nitric oxide update live.

NCS
87
Breathing freely
Fully blocked Partially open Fully patent
89
NFI
Voice nasal flow
97%
eIO₂
Oxygen efficiency
72%
eNO
Nitric oxide delivery
Start today

Your nose has been
speaking all along.

One sentence. Under three seconds. A clinically grounded score that tracks your nasal airway — every day, calibrated to you.

Download the SONU app to try SONUCheck for free Track with SONU

eIO₂ and eNO are wellness estimates derived from published physiological models — not direct clinical measurements. Not a substitute for medical advice. SONU is FDA authorized (De Novo) for nasal congestion associated with allergic and non-allergic rhinitis.