Jack Hooper

The problem

Stress and anxiety are now a pandemic. 18.1% of Americans live with an anxiety disorder and the World Health Organization estimates the annual cost of workplace stress in the US has grown from $190bn in 2017 to $300bn in 2018. These complex and rapidly growing problems have few good solutions and are not only costly but have a huge impact on quality of life.

The solution

Jack co-founded the company, doppel, to create a wristband that seamlessly interacts with our bodies to help us achieve the optimal state of mind for whatever situation we find ourselves in.

The wristband creates a silent rhythmic pulse that you feel on the inside of your wrist. Its heartbeat-like vibration works naturally, within moments, to help you feel calm, focussed, energised or relaxed. Like listening to music, a fast rhythm helps you to feel more alert while a slower rhythm is calming. 

white doppel on wristDoppel’s wristband can be used to reduce stress and stay focused. Those in high-stress jobs use it to stay anchored and calm. It has been used to overcome nerves at important events, manage anxiety and by those with ADHD to stay focused.

The technology is inspired by psychophysiology - the study of the relationship between the mind and the body and has been shown to reduce stress in controlled, peer-reviewed tests. User trials have also shown that it helps with concentration over longer periods, remaining calm under pressure or maintaining motivation during fitness training.

The wristband offers an alternative to traditional energy supplements, meditation and music as a way to achieve calm, concentration and focus. Following a successful Kickstarted campaign, the company is now focused on delivering its technology more widely to impact the growing mental-wellbeing market.


  • 2019 – doppel launches sales, selling >200 units in the first week
  • 2018 – doppel’s first product delivered to 1,600 pre-order customers
  • 2017 & 2018 – doppel selected as one of Hello Tomorrow’s Top 500 deep-tech startups worldwide 
  • 2015 – doppel wins the People’s Choice Award at Pitch@Palace
  • 2015 – Successful Kickstarter campaign supported by 820 backers to raise £111,194 to support manufacture doppel’s first product

Jack was awarded a 2016 RAEng 1851 Royal Commission Enterprise Fellowship to support doppel in manufacturing smart wearables and bringing them to market.

Mentored by

"I am astonished to find that I really do start to feel more alert and focused."

Rosalyn Wikeley, Daily Mail

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