Enjoy the best from the sun with HappySun technology


√    Personalized timer to prevent sunburn

√    Alerts during your sunbathing period

√    Personalised advice based on UV levels, monitored in real-time

√    Track the time you spend out in sun and manage your daily “sunlight intake”

√    Vitamin D level monitoring

√    Reduce the effects of photoageing

√    Personalised advice on amount of sunscreen needed

√    One-tap sunscreen reminders

√    Discover the best sunscreen for you

√    UV Index Map

√    Sun exposure history



UV-A, UV-B, visible and infrared solar radiation can cause erythema, the beginning of sunburn and photoageing, the premature ageing caused by the sun. HappySun uses real-time satellite-based information to monitor the effects and give you relevant and accurate advice.


Manage your daily sun dose

Be in control of how much sun time is enough for you

Manage your sunburn


  • Avoid sunburn and get a sounded alert once you’ve had your personal safe dose of sunshine
  • Get personalised sun care monitoring based on the weather, live location, UV index, reflection from sun exposure surface (beach, stones, lawn, etc.), skin type, clothing and sunscreen used.

Manage your skin photoageing


  • UV-A and VIS-IR photoageing are both estimated by HappySun in terms of differential photoageing radiation dose with respect to typical lifestyle
  • Typical exposure to outdoor solar radiation and living location are considered, as well as the spectral protection effects of any sunscreen applied (e.g. PPD, PA)

Manage your vitamin D levels


  • Vitamin D is produced in the skin from exposure to sunlight. You can increase your vitamin D levels by going out in the sun.
  • An alert in the app notifies you when you have received enough sunlight to reach your recommended daily level of vitamin D.

siHealth Ltd.

Building R104, Rutherford Appleton Laboratory, Harwell Campus.
Didcot – Oxfordshire, OX11 0QX (UK)

VAT Registration number: 303 8383 15