# Just Breathe: CO2 Tolerance

Canonical page: https://letsbreathe.app/co2-tolerance-breathing-app

Practice gentle breath holds and paced breathing to gradually improve CO2 tolerance with safe, guided timing.

## Overview

Guided breath holds and pacing. Customize inhale/exhale/hold durations with clear visual guidance and logs.

## Key features

- Custom Patterns: Create and customize your own breathing patterns
- Different Themes: Choose from a variety of calming visual themes
- Focusing Sounds: Immerse yourself with ambient sounds
- Sessions History: Track your progress over time

## Availability

The app is available through the App Store and Google Play.

## Related pages

- [Just Breathe overview](https://letsbreathe.app/index.md)
- [Breathing guides](https://letsbreathe.app/blog.md)

Last updated: 2026-09-16