Do you feel stressed, anxious or unfocused? Do you have trouble falling asleep? A simple paced breathing exercise can help you in a few minutes.

Let Kardia guide your breath with sounds and the calm movement of the sphere. Feel your body and mind relax, and your heart rate vary in harmony with your breath. This powerful and simple exercise is accessible to everyone, including kids.

- Stress relief
- Calm down anxiety attacks
- Cardiac coherence
- Sleep aid: fight insomnia by focusing on slow breathing
- Deep relaxation
- Meditation sessions and sophrology exercises
- Concentration improvement

- Breathing rate between 5 and 7 cycles/min, with inhalation-exhalation ratio setting
- Exercise duration between 1 minute and 1 hour.
- Usable without looking at the screen thanks to guiding sounds

During ten days, try those exclusive features for free:
- Large choice of high quality relaxing sound sets
- Breathing rate between 1 and 15 cycles/min
- Target mode, allows to slow down or speed up breathing rate during the session
- Advanced mode, with 0.1s precision on inhalation and exhalation durations

Unlock all those features with a single in-app purchase.

With Kardia, you can practice heart rate variability (HRV) training through paced breathing. By breathing at a specific rate, around 5.5 cycles/min, your HRV increases and becomes regular. This state is known as cardiac coherence, or cardio-respiratory coherence. Many scientific studies have demonstrated that it has beneficial effects on stress and anxiety level, blood pressure, depression and sleep.

The best breathing rate is different for everyone. With Kardia, you can set very precisely the exercise frequency, so you will just need a few tries to find out the value that gives you the best results.

What’s New

Version 3.0

- Target mode and Advanced mode are now part of Kardia's free features, with the ability for everyone to set the breathing rate between 1 and 15 cycles per minute.
- The application's customization settings (sounds, display, vibrations) are accessible through the in-app purchase.
- If you have not made the in-app purchase yet, you have another 10 days to try out all the features of the App.

New features and improvements:
- You can now change the background color
- Full-screen display option: follow your exercise in the dark using the light projected by the screen on the walls and ceiling
- Vibration option: the device vibrates once at the end of each inhalation and exhalation, and three times at the end of the session
- Visual cues option: two circles indicate the minimum and maximum size of the sphere, making it easier to locate oneself in the breathing cycle
- Lock screen function allows to practice with your phone in your pocket
- A warning is displayed when the app is launched with the device in Silent Mode
- Improved layout of the user interface on iPhone X, XS and XR
- The three application modes are now accessible from a single button on the main screen

Ratings and Reviews

4.6 out of 5
38 Ratings

38 Ratings

PIPtonium ,

Just what I need.

This app is all that I want and nothing extra. The controls are simple and accurate; intuitive to use. I’m using it regularly.

Lady_betsie ,

Very zen! Love it!

Very zen! Love it!

Box 2012 ,




Olivier Tache
72.3 MB

Requires iOS 7.0 or later. Compatible with iPhone, iPad and iPod touch.


English, French

Age Rating
In-App Purchases
  1. Unlock Kardia $1.49


  • Family Sharing

    Up to six family members will be able to use this app with Family Sharing enabled.

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