Free trial of MyCircadianApp with Mini Course on Circadian Biology 

What you'll get:

• 3 free weeks with Android
• 4 free weeks with Apple
• Free version of the app for lifetime!
• Track sunrise, UVA, UVB, Sunset 
• Measure lux in your environment
• Compass
• Moon tracker
• UV index
• Vitamin D/sun exposure timer 
• Video playlist showing you why each window of sunlight is important and how long to stay out
• Video showing you how to use the app 
• Studies to back up the scientific basis of the app