Apnea training
CAPNIA
CO₂ tables, static apnea and progress tracking. An app that guides you by voice while you train, works offline and asks you to install nothing.
Runs in your browser · Works offline too
CO₂ table
Round 4 of 8
Places open
We need 20 volunteers to publish CAPNIA on Google Play
We need 20 testers to keep the app installed on their Android for 14 days. In return: free access to everything and your name in the credits as a Founding Tester.
20
Places open
What you can train
Three tools covering the essentials of dry training.
Carbon dioxide tolerance
CO₂ tables
Series of fixed-length breath holds with rests that keep getting shorter. CO₂ builds up round after round and your body learns to live with the urge to breathe instead of giving in to it.
- Progress ring and round counter always visible.
- The next phase is announced before it arrives.
- Protocols you can match to your current level.
CO₂ table
Round 4 of 8
Static apnea
Preparation phase
Pulse
62bpm
SpO₂
98%
"Get ready. Final inhale in 10 seconds."
Sessions at rest
Static apnea
Timed holds lying down or seated, with preparation, apnea and recovery phases marked step by step. Nothing to decide on the fly: just follow the guidance and breathe when told.
- Voice guidance so you never look at the screen.
- Live pulse and saturation from a Bluetooth sensor.
- A structured recovery phase when you finish.
Your progress, recorded
Progress
Every session is saved with its times. You can see whether your marks are climbing, whether a protocol is working, or whether you have been stuck for weeks without noticing.
- Full history of sessions and personal bests.
- Your trend at a glance.
- Everything stored on your own device.
Progress
Your last 8 sessions
Personal best
4:12
This month
14sessions
Static apnea
today
CO₂ table
Yesterday
Static apnea
3 d ago
Three steps and you are training
Nothing complicated to set up. Open it, train, it saves itself.
- 01
Pick your session
Open the app and choose the type of training and the protocol for today.
- 02
Follow the guidance
The app marks every phase with sound and voice cues. You focus on breathing; it handles the clock.
- 03
Review your progress
When you finish, the session saves itself and joins your history so you can see the trend.
Built to be used with your eyes closed
Literally: during a breath hold you should not be staring at a screen.
Voice guidance
The app calls out each phase out loud. No need to watch the screen during a hold, or touch it with wet hands.
Works offline
It is a PWA: once loaded, train in the basement, in the car or at the poolside with no signal.
Bluetooth sensors
Pair a pulse oximeter or a compatible strap and follow your vitals during the session.
Installable
Add it to your home screen and it behaves like a native app, without going through any store.
Audio cues
Precise sound signals for the start, the end and every phase change.
Read this before training
Apnea carries real risks
Holding your breath can cause a blackout with no warning. In water, that is a drowning. No app can watch over you or react for you.
Never in water unsupervised
Not in a pool, not in open water, not in the bath. Always with a qualified buddy watching you.
These tables are for dry training
Do them lying down or seated somewhere safe, never standing, driving or in the water.
Do not hyperventilate
It dulls the urge to breathe without giving you more oxygen, and brings on a blackout with no warning signs.
Talk to a doctor
If you have heart or respiratory problems, high blood pressure, epilepsy, or you are pregnant.
CAPNIA is a training tool, not a replacement for instruction from a qualified coach or for medical advice. You use it at your own risk.
Frequently asked questions
Do I need previous apnea experience?
Not for dry training, but you should understand what you are doing. If you have never done apnea, the sensible start is an in-person course: you will learn the technique and, above all, the safety rules no app can replace.
Can I use CAPNIA in the water?
The tables are designed for dry training. You must never practise apnea alone in water, and an app cannot watch you or pull you out of a blackout. If you train in a pool, always do it with a qualified buddy watching you.
What is the difference between a CO₂ table and static apnea?
A CO₂ table is several holds of similar length with progressively shorter rests: it trains tolerance to carbon dioxide build-up. Static apnea is a single sustained hold, at rest, measuring how long you last.
Do I need to install anything?
No. CAPNIA runs in your browser. If you like, you can add it to your phone home screen and it will open like any other app, offline included.
Which devices does it work on?
Any modern browser on phone, tablet or computer. Voice and Bluetooth sensor features depend on each browser, so they may vary by device.
Start your next session
Open CAPNIA in your browser and get going with the first table. Nothing to install.
Open the app