iPhone Screenshots


Stop measuring how you sleep. Start measuring the main influencing factor affecting your sleep.

**Are you feeling sleepy or energised right now?**

Using your phone camera, the LYS App beautifully illustrates how the light around you is affecting your wellbeing in real-time. Improve sleep in a matter of days and boost concentration, energy levels and productivity.

**To access more advanced features that will help you reach better sleep, pair the LYS App with the LYS Button.**

With the wearable device paired, use the NOW function for a more accurate reading of the precise light stimulation your body is receiving in real-time from your surroundings.

Guided by our friendly research-based nudges and notifications, you can set your personal light goals and track your progress with three daily light targets.

Paired with the LYS Button you can access the DAY feature, which gives you an overview of your 24-hour cycle, your wake up time and set bedtime.

Download the app and start improving your sleep in no time.

What’s New

Version 1.5.3

Thanks for using the LYS Technologies app. We've been busy making some updates and improvements.

What's new?

• The Light Diet® is now available for all users, our new wellbeing programme for a healthy sleep-wake cycle. The 2-week programme tracks your light exposure and gives a detailed report with advice on how to improve your sleep and energy levels.
• New and simplified onboarding process for new users and Light Diet
• Bug fixes and overall improvements
• Improved and simplified connection with the LYS Button, your wearable light sensor.

Love using LYS? Don't forget to rate us. Your feedback helps us make the app even better.


84.7 MB

Requires iOS 10.3 or later. Compatible with iPhone, iPad and iPod touch.



Age Rating
Infrequent/Mild Medical/Treatment Information


  • Family Sharing

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

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