Circadian: Your Natural Rhythm

In-app purchases
305 reviews
Content rating
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About this app

Ready for a lifestyle that prioritises your health and wellbeing?
Ready for living with more energy and focus?
Keen to naturally improve mood, body composition and sleep?

The answer? Do your daily activities at the optimal time for your body - aka circadian rhythms or the power of 'when'. ⏰

Enter Circadian, your app for applying circadian rhythms, and living a more natural lifestyle. Circadian uses your local solar time and some user settings to calculate your circadian rhythms, also known as biorhythm.

Set reminders and alarms for critical circadian events 🔔
Being a biorhythm calculator, Circadian provides you with reminders & alarms to operate on your optimal biological schedule. Apply the future of lifestyle medicine today. Start sleeping, waking, eating, exercising and working when you are meant to. Set reminders or alarms for
○ solar times (daybreak, sunrise, solar noon, sunset, nightfall)
○ ultraviolet light rise and fall (UVA/UVB)
○ sleep and wake times as well as a digital sunset
○ eating and fasting times as well as meal timings
○ morning and peak exercise times
○ peak cognition times

Adjust your sleep with the seasons💤
Circadian rhythms govern daily functioning, whereas seasonal rhythms, also referred to as infradian rhythms, affect longer-term behavioural and metabolic changes. Circadian can adjust your sleep duration dynamically based on the changing light conditions at your location. This keeps your bodies biorhythm in sync with seasonal changes.

Feast and fast in line with natures pulse 🍴
Optimise your eating times and upgrade your intermittent fasting routine to a whole new level. Eating and fasting in sync with circadian and ultradian rhythms (less than a day) is essential if you want to reverse a metabolic disease or avoid getting one in the first place.

Learn and implement with Circadian 💡
The learn section provides you with carefully curated content on all things circadian rhythm related. Circadian is the most science-backed lifestyle app yet gives you the needed context fast.
○ Dive deep into the thoroughly researched content
○ Take action with our suite of practical suggestions
○ Browse the best products to support your biorhythm
○ Rest easy knowing that all content is based on more than 1000 scientific references

The science behind circadian rhythms (chronobiology)🔬
Your body's circadian rhythms are 24-hour cycles of biological, hormonal, and behavioural patterns. This biorhythm modulates a wide array of physiological processes, including your hormones, sleep, hunger, and metabolism, ultimately regulating body weight, performance, mood and susceptibility to disease. As such, circadian rhythmicity has profound implications for wellbeing and longevity.

The 2017 Nobel price in medicine was given for research on circadian rhythms. Circadian clocks in almost all of your cells govern cellular functioning. When you disrupt your circadian clocks chaos, inflammation and disease are the natural consequence.

Artificial light or "junk light" is the main culprit for circadian disruptions. Which is why more natural light exposure, especially at sunrise and sunset, is crucial to reset and tune your biorhythm. Learn more in the app.

Still doubtful? ☝️
Consider that circadian disruptions, and the ensuing inflammation, are linked to almost every modern disease from diabetes to cancer. Don't believe it? Search: "shift work" or "circadian rhythm" plus the name of a disease.

What does Circadian cost? 💵
Circadian offers a 7-day free trial period with some functionality and content restricted. You can continue using Circadian after the free trial with further limitations. For the full version, you need to subscribe or purchase the app (prices in USD):
Yearly subscription: $15.99 - $23.99
One-off purchase: $39.99 - $59.99

💚 Follow natures pulse.
⚡ Increase your capacity for life!
🌅 Download Circadian now.
Updated on
Jan 30, 2023

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
No data shared with third parties
Learn more about how developers declare sharing
This app may collect these data types
Location and Messages
Data is encrypted in transit
You can request that data be deleted
305 reviews
Anita Sra
January 31, 2023
This is a great app if you are looking to align certain activities to daylight over the course of the year. They have also done a good job updating the app to resolve prior issues. When I had a problem with my subscription they responded quickly and rolled out an update to fix it. This is the best app I've found with adjustable sunrise/sunset alarm functionality.
Did you find this helpful?
Natural Cycles
February 2, 2023
Great to have you with us, Anita! Sorry about the temporary issue. Glad we could resolve it together. Great that you are appreciative of Circadian and are recommending it to your friends. That means a lot. Any questions or issues, be in touch. Mind your rhythm, mind your light ☀️ Bastian | Team Circadian
Christopher Thias
January 20, 2021
Had trouble at first with the subscription, but it seems to be fixed. Great app, but still needs further development. First, the startup splash screen is a little annoying. It would be nice if that were optional. What I would like to see even more is a widget showing all the different parameters in the circular map found in the app. Would make an excellent widget to keep track of all the parameters. And highlight and specify by name the parameters that are active at that point in time.
9 people found this review helpful
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Natural Cycles
January 20, 2021
Thanks for your help and suggestions, Christopher! We really appreciate it 🙏. We have added a widget to our roadmap 👍 Rest assured that we will elevate Circadian far beyond what it is currently. We have many exciting things in the pipeline ✨ Enjoy Circadian and be in touch if you have any questions. Bastian | Team Circadian.
Amy Miller
September 1, 2021
The app has great educational content and health articles. The notifications and alarms are also helpful. I travel full time so I have to update when I go to a new time zone manually. Otherwise, the notifications are off. Great app for helping get into a better flow with your circadian rhythms and education on the whys behind it.
10 people found this review helpful
Did you find this helpful?
Natural Cycles
September 2, 2021
Thank you for your review, Amy🙏 Great that Circadian is helpful to you. Yes, changing locations currently requires the user to press auto-locate again or load the new location manually. Automatic auto-location is on our list of future features. I appreciate your patience. Many thanks, Bastian | Team Circadian

What's new

This version fixes some subscription issues.

We're actively working to improve Circadian.
Here's to optimising our circadian rhythms and lifestyle one step at a time. Feel free to contact us at if you have any issues, feedback, suggestions or questions.

Mind your rhythm, mind your light ☀️
Team Circadian