Performance breath training, calibrated to you
Measure how calmly you handle rising CO₂ in ninety seconds. See your score and level, then save it to apply a breathing pace matched to you.
Free · 90 seconds · No account required to see your result
Free · 90 seconds · No account required to see your result
One test. A training direction.
Your result is useful on its own. Saving it turns that result into a breathing pace, a matched program, and a baseline you can compare over time.
Score
Your controlled-exhale time
Level
Where your current respiratory control sits
Training direction
Save to apply a matched box-breathing pace
Full product access is free when you save during Early Access.
Need an effect before a program?
Start a guided state shift without an account. Auralize handles the timing so you can stay with the breath.
Clear the noise before demanding work.
Start shift →
Build alertness without the jittery edge.
Start shift →
Use physiological sighs to settle acute activation.
Start shift →
Give a busy system a clear off-ramp.
Start shift →
A day in your nervous system
From the first hour awake to the last minutes before sleep, your state keeps shifting. Scroll through one day to see where Auralize helps you activate, focus, steady pressure, and wind down.
06:42
01 · Dawn · before the inbox
Your body starts preparing before you wake. Without proper activation the first hour becomes fueled by caffeine and reactive emails.
Program
Controlled power breathing upon waking clears grogginess and builds a sharper ready state. Box breathing afterward stabilizes the activation so you feel sharp, not wired.
Open program
Auralize Early Access · Free during Early Access
Program
Controlled power breathing upon waking clears grogginess and builds a sharper ready state. Box breathing afterward stabilizes the activation so you feel sharp, not wired.
Open program
Auralize Early Access · Free during Early Access
13:15
02 · Day · post-lunch fog
The early-afternoon dip is real. Stress, fatigue and unsteady breathing can make it feel heavier.
16:30
03 · Dusk · the green-room minutes
Before a pitch, lift, race, or hard conversation, activation can outrun control. The goal is not to kill the energy. It is to give it a rhythm.
23:30
04 · Night · horizontal but not resting
You are horizontal, but your nervous system is still upright. The day is over on the calendar before it is over in the body.
The CO₂ tolerance test is the core assessment on the platform and it is free for everyone. It takes ninety seconds, no sign-up, and gives you the baseline that powers CO₂ Capacity Builder once you sign in to save it.
Free · Result shown before account · Save to start matched training
Built like a practice, not a mood board
Most breathwork apps and coaching are built for quiet moments. Auralize trains breath control for real pressure: measurable, repeatable, and specific enough to become a skill.
Measure
Baselines turn breathwork into training data: CO₂ tolerance, BOLT, resting rate, exhale control, and power capacity.
Unlock
Programs open from what the assessment shows, so the next step is tied to your physiology instead of guesswork.
Scale
Session intensity adjusts around the result, keeping practice challenging enough to matter and controlled enough to repeat.
Transfer
Shifts help you take the skill outside the app, with fast interventions for focus, activation, recovery, and sleep readiness.
The library is growing across assessments, programs, and shifts, but the loop stays the same: measure first, train with intent, and use the signal when your day actually asks for it.
Read the practice notes
The app gives you the practice. The articles explain the physiology: why CO₂ tolerance matters, how box breathing changes control, and where breath training fits for athletes and high-output professionals.
How elite athletes use breath control for composure, efficiency, recovery, and activation — and what the science says about it.
CO2 tolerance training works best when it is measured: take a controlled assessment, let the score set your box-breathing interval, train the Capacity Builder, then retest before changing difficulty.
Used in military training, hospital pre-op protocols, and elite sport — box breathing has more peer-reviewed evidence behind it than most breathing techniques. Here's what it does and when it works.
One breathing rhythm — 5.5 breaths per minute — produces measurable changes in heart rate variability. Here's what the research shows and how to use it.
Begin where it starts.
Free · 90 seconds · See your result first · Save to start CO₂ Capacity Builder
Or preview an Early Access program from the day —
Install Auralize
Install the app for a full-screen session experience, faster loads, and training that works even offline.
