About
Measure the melanopic content of your light environment to support your body's natural sleep-wake cycle. Get actionable recommendations to improve sleep quality and daytime alertness by understanding how different light sources affect your circadian rhythm.
What's New in Circadian Rhythm Light Meter
1.1.0
June 14, 2026
• Misc minor improvements This is a new app. Please let us know what you think in a review!
MoreSubscription plans
Full Access (Month)
Full access for one month
In-App Purchases
$9.99
Full Access (Lifetime)
Full access - Pay only once, use forever
Developer apps
FAQ
What is the Circadian Rhythm Light Meter app?
Circadian Rhythm Light Meter is a utility app that measures the melanopic content of your light environment. It helps you understand how light affects your body's internal clock, influencing sleep and alertness.
How accurate is the Circadian Rhythm Light Meter?
For optimal accuracy, the app recommends using a common white paper at eye level, illuminated by the light source you want to assess. Selecting the correct light source type and using optional calibration further enhances reliability.
What are the key metrics provided by Circadian Rhythm Light Meter?
The app provides key metrics such as Melanopic Equivalent Daylight Illuminance (mEDI), Melanopic Daylight Efficacy Ratio (mDER), Melanopic/Photopic Ratio (M/P), Melanopic Irradiance (MI), Equivalent Melanopic Lux (EML), Color Temperature (CCT), and Illuminance (lux).
What are the subscription options for Circadian Rhythm Light Meter?
Circadian Rhythm Light Meter offers a free trial period of 14 days for full functionality. After the trial, users can choose a one-time fee or a subscription plan, with the monthly subscription costing $0.99.
Does Circadian Rhythm Light Meter have ads?
The provided data does not specify if the app contains advertisements. However, it does mention a free trial followed by a one-time fee or subscription, suggesting monetization beyond ads.
What devices is Circadian Rhythm Light Meter compatible with?
The app is available for mobile devices, as indicated by its listing as a mobile application. Specific operating system compatibility (iOS or Android) is not detailed in the provided information.
How often is Circadian Rhythm Light Meter updated?
The app was last updated on June 14, 2026, with version 1.1.0. This indicates a recent update, suggesting ongoing development and support for the application.
What is the age rating for Circadian Rhythm Light Meter?
Circadian Rhythm Light Meter has an age rating of 17+. This is likely due to the technical nature of the information presented and its target audience.