01 Free · Patented
Screening
A short guided test uses your phone’s microphone to listen to your breathing — relaxed breathing, a breath hold, then recovery — and produces your Breathing Control Index (BCI). No wearable required.
Personalized health for breathing
Most of us breathe incorrectly. We help you fix that.
Better breathing supports healthier living, deeper sleep and stronger performance — and can ease the toll of daily stress, hay fever, asthma and sleep apnea. BreatheSimple builds personalized breath-training courses you can do at home, with nothing more than your phone.
Example result
Every course is grounded in world-class science and clinical research. BreatheSimple analyzes your breathing, compares it with people like you, and builds a personalized program — then gives you regular feedback as you progress.
Three pillars
One control system, three ways to act on it
02 Coming soon
Sleep instability
Passive overnight analysis of how stable your breathing stays while you sleep. This measurement is on our roadmap and will arrive in a future release.
03 Personalized
Guided training
If your results suggest you’d benefit, BreatheSimple builds a personalized breathing program designed to help retrain the control system behind steadier breathing.
How it works
A four-minute test you can take anywhere
Screening → results → personalized training. No clinic, no wearable.
- 1
Breathe relaxed
Sit comfortably and breathe normally while the app listens. This captures your natural resting pattern.
- 2
Hold your breath
A short, guided breath hold gently challenges your control system so it reveals how it responds.
- 3
Recover
The app measures how quickly and smoothly your breathing settles back to baseline afterwards.
- 4
Get your BCI
You receive your Breathing Control Index and, if helpful, a personalized training program.
The science
Dynamic microdata — the Gen 3 signal
Wearables evolved from heart rate (Gen 1) to heart rate variability (Gen 2). The next step is dynamic breathing microdata — the moment-to-moment microstructure of your breathing, not a once-a-day average.
When your breathing control over-reacts — a property scientists call elevated loop gain — breathing can become unstable. BreatheSimple is built to detect that instability and help you train it back toward steadiness.
- Gen 1 Heart rate
- Gen 2 Heart rate variability
- Gen 3 Dynamic breathing microdata
Questions, answered
Frequently asked questions
What is BreatheSimple?
BreatheSimple is a smartphone app that screens and trains your breathing. It uses your phone’s microphone to measure how well your body controls your breathing, gives you a Breathing Control Index (BCI), and offers personalized guided breathing programs. The screening is free.
How does BreatheSimple measure my breathing?
During a short guided test, your phone’s microphone records the sound of your breathing through three phases — relaxed breathing, a breath hold, and recovery. BreatheSimple analyses the moment-to-moment microstructure of that signal to estimate the stability of your breathing control and produce your Breathing Control Index.
What is loop gain?
Loop gain describes how strongly your body’s breathing control system reacts to small changes in oxygen and carbon dioxide. When loop gain is high, the system over-corrects and breathing can become unstable — speeding up and slowing down in cycles. Measuring and training this responsiveness is central to what BreatheSimple does.
What is the Breathing Control Index (BCI)?
The Breathing Control Index is BreatheSimple’s summary score of how stable your breathing control is, based on your guided screening test. A more stable result suggests steadier control; a less stable result may indicate you could benefit from guided breathing training.
Is BreatheSimple a medical device?
No. BreatheSimple is a wellness and screening tool, not a medical device. It does not diagnose, treat, or cure any condition. If you have concerns about your sleep, breathing, or health, please consult a qualified clinician.
Do I need a wearable or special hardware?
No. The screening runs entirely on your smartphone using its built-in microphone. While the data sits in the lineage of advanced wearable signals, BreatheSimple needs no extra device to get started.
How much does it cost?
Screening and your Breathing Control Index are free. Personalized guided breathing programs are offered through a paid subscription, so you only pay if your results suggest training would help.
How is my personal data handled?
Your privacy comes first. The audio from your breathing test is used to calculate your Breathing Control Index and personalize your training, and it is treated as confidential, health-related information. BreatheSimple is built to keep your data secure, we do not sell your personal information, and you stay in control — you can request that your data be deleted at any time.
Be first in line
Join the waitlist
Get early access to the BreatheSimple app and your free Breathing Control Index. We'll email you when screening opens in your region — no spam, ever.
We use your email only to tell you when BreatheSimple is available.