Measure the quality of light in your everyday surroundings and use actionable feedback to improve your sleep, energy levels, concentration and mood.

The LYS 1.0 light-measuring wearable and app offer curated content, tools and data-driven insights that inspire a healthier sleep-wake cycle. Customise your wake-up and bedtime marks on the LYS 24 hour clock to receive personalised feedback. Join the circadian rhythm revolution and make light intake a crucial health parameter for your wellbeing.

The LYS app sends actionable tips personalised to your age, gender and chronotype to help guide you to a healthier light diet. Simply. Naturally.


Measure the light in your immediate surrounding for real-time light stimulus feedback and see whether your surrounding light is making you feel sleepy or energised.
Basic functions and insights are available in the app for users without the LYS 1.0 wearable. Use with the LYS 1.0 wearable for more accurate readings and expanded data insights.


Your personal 24 hour clock shows your daily light intake through a beautifully designed live graph.
Insert your wake-up and bedtime to create a personalised schedule for optimum light intake and when to avoid harmful light.
This feature is only available with the LYS 1.0 wearable.

Daylight Goal

Make the most of natural light in the beginning of your day with the Daylight Goal.
The LYS app will help you reach your Daylight Goal by sending friendly nudges and tips in guidance.
This feature is only available with the LYS wearable.

Sleep Ready Goal

Avoid harmful blue and high intensity light during the last hours before you go to sleep with the help of the Sleep Ready Goal.
For better sleep quality and healthy melatonin production, maintain the target at 100% by surrounding yourself with dim and warm light as you prepare for bedtime.
This feature is only available with the LYS wearable.

Perks and extras

The LYS glossary: learn about key terminology for circadian rhythm and light health.
Direct access to LYS original reflections: learn about circadian rhythm through opinion pieces, articles and editorial tips for a healthier lifestyle.

The LYS Technologies team is working hard to constantly improve and evolve the app, if you have any feedback or suggestions just get in touch and we’ll keep you in mind for the next update.
Read more
5 total

What's New

Minor bugfixes for enhanced user experience.
Read more

Additional Information

April 5, 2018
Current Version
Requires Android
5.0 and up
Content Rating
Offered By
LYS Technologies Ltd
Second Home Holland Park 48-49 Princes Place London W11 4QA UK
©2018 GoogleSite Terms of ServicePrivacyDevelopersArtistsAbout Google|Location: United StatesLanguage: English (United States)
By purchasing this item, you are transacting with Google Payments and agreeing to the Google Payments Terms of Service and Privacy Notice.