8 years of Vagus nerve research

For Apple and Withings ECG-enabled watches

After developing our first vagus nerve stimulation prototype in 2014, we quickly realized that we needed better data and a new type of ‘before and after’  test for our neurofeedback.   Our founder, Gustaf Kranck, invented one – the VAGUS® ECG test for hand-to-hand ECG.  Now it is available for everyone who owns an Apple- or Withings ECG-enabled Watch  .

There is broad consensus from scientists that the vagus nerve is our most important nerve for immunity and health problems such as stress, anxiety, inflammations and depression.   By monitoring the vagus nerve, users can adjust their lifestyles to achieve better health and higher ‘life-quality’.  To give the necessary advice and information to our users,  we process the complex vagus nerve data with artificial intelligence (AI).    Algorithms has to be versatile, thorough and personalized.  

You only need to do the 30 sec. test three times per day to get this unique information on your health.  We calculate the precise correlation between breathing and pulse since it is critically important in establishing the ‘state’ of your vagus nerve ‘right now’. Within seconds our cloud intelligence will display the results on our Breathe Flow App..  

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AI diagnostics: For you, your health coach or doctor - NOW

Understand how your breathing and heart is working - NOW

Unique testing & personalized analytics to help you - NOW


By doing the BREATHE ECG test with controlled breathing (5 sec inhale and 5 sec exhale), our unique analysis calculates exactly how the person is breathing and provides easy-to-understand feedback.   More than half of our current 7000 Vagus Watch and VAGUS ECG users have problem doing proper diaphragmatic breathing.   By using our tests and feedback, almost everybody improved their breathing within weeks of starting daily testing.    All data is calculated in the cloud and saved there if the user later wants to start using our ‘Nerve Explorer’ cloud service to monitor longer term changes – or subscribe to our breathing coaching partners.   If the user approves, breathing coaches can get real time access to the test results to better help their clients.

With the Breathe Flow app we also introduce user ownership to smartwatch data.  This is done with the VAGUS NFT.  Read more about it on

Our other apps available on app store:


Another way to visualise breathing on Apple Watch.  Download price 2,99 USD/EUR (depending on your region)  Now also including unlimited amount of breathing tests for the first 12 months!


Our ‘full package’ analytics of the VAGUS ECG test.  US:  6.66 $/month (19.99$/3m), UK: 6.50£/month (19.49£/3m), EU: 7.33€/month (21.99€/3m), Japan: 700¥/month (2100¥/3m)

We built it for ourselves.  We track our health by doing at least three Vagus ECG Tests per day – morning, noon and evening.  We hope you will too.

Making smartwatches meaningful and financially rewarding

More facts and science found on our Science page. 

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