THE “WHEN” OF YOUR DAILY ACTIVITIES
Feel more energized, think more clearly, and sleep more deeply by syncing your daily life to nature’s rhythm. Circadian helps you wake, eat, move, work, and rest at the optimal times for your body so that you can be at your best.
Achieve natural health by honoring your body’s built-in clock.
ALIGN WITH SUNLIGHT & SEASONS
Start living more in alignment with your local environment. Circadian harnesses daily and seasonal patterns to optimize your days and thus your health. Uncover sunset, sunrise UVA/UVB rise & set as important daily markers and time cues. Entrain your body to the time of day, night, and season for a radically different experience of living.
BEDTIME & BIORHYTHM CALCULATOR
Plan your optimal hours of sleep with our seasonal sleep calculator. Let your sleep cycles sync to nature’s timing and reap the benefits. Understand why just five minutes of morning light can boost next night's sleep quality by 20%. There is a lot to discover. Everything is connected.
EAT & FAST IN SYNC WITH NATURE
Research shows that intermittent fasting and early time-restricted eating—eating during daylight hours and fasting after dark—support a healthy metabolism, balanced blood sugar levels, and deeper sleep. Schedule meal and fasting reminders that honor nature’s timing.
THE SCIENCE OF CIRCADIAN RHYTHMS
Built on Nobel Prize–winning chronobiology, Circadian reveals how light, hormones, and environment shape your well-being. Learn why morning sunlight is crucial for your mood, energy and hormonal balance, how your body needs darkness at night, and why robust rhythms guard against chronic disease. Explore our in-app library for articles and practical tips on melatonin, exercise timing, artificial light, cognition, grounding, and more.
With over 800 resources and 1000+ references, Circadian is the ultimate guide for learning about the most important aspect of your health.
EVERYDAY BENEFITS
◾ SLEEP WELL – Difficulty falling or staying asleep and excessive sleepiness is often due to chronic circadian disruption. Instead, drift off naturally and wake refreshed.
◾ BALANCE WEIGHT – Circadian disruption is strongly associated with insulin resistance and obesity. Eat and fast in line with nature for an efficient & healthy metabolism.
◾ BOOST ENERGY – Aligning with natural rhythms and increasing exposure to sunlight boosts cellular energy production.
◾LIFT MOOD – Circadian rhythm disruptions and light disturbances are a major hallmark of severe mood disorders. Learn how to produce endorphins, dopamine, and serotonin in your body, naturally.
◾LIVE LONGER – Circadian rhythm disruption plays a direct role in diseases of ageing and ageing itself. The opposite is also true!
◾GET STARTED FOR FREE – Try Circadian for free with no credit card required.
START PRIORITIZING WHAT MATTERS MOST
◾Set reminders for critical circadian events essential for health and vitality.
◾Align your lifestyle with the light and dark cycles at your location.
◾Learn the science of circadian rhythms and how to apply it to your daily life.
Download Circadian today—and step into a more harmonious and healthier life.
I love this app! It’s really fulfilling to have a visual and a tool to track our rhythms. I feel it the link between how God designed us to live in our ancient traditions with a modern world. I have been using the tool for a while over a year I believe, and recently saw that even Andrew Huberman uses it also! So cool! When you first download it, they offer a promo kind of wish they offered other opportunities to take the promo pricing besides when the download happens, there’s some amazing literature and courses and the education section. It’s really astonishing that more people don’t embrace the Circadian life. Science has accomplished things that don’t seem fathomable, but then we don’t embrace the most basic rhythms that are available to us to keep us Physically, emotionally and spiritually healthy. So many people reach for drastic solutions to solve problems that I truly think can be solved by following Circadian life. We sleep and we eat and we have movement. We could all be better about all of these patterns, but I’m starting to feel like Sun exposure is as important as any other kind of hygiene. If we can align our sleep and are eating and movement with sonic exposure. we can move from a place of surviving to thriving. we take basic needs and turn them into really affective forces in our life.
Simple and great. Info and learning is the hidden jewel.
Eddiemoto
I’m learning about Circadian rhythm and how to use the information to approach my day differently. The informing provided within the app is the real jewel. I’m learning a lot. **The Good** - The My Day tab is very straight forward. I love how easy it is to setup a notification from the details screen. - The Dashboard tab is clear and effective. - The Learn tab is absolutely full of great information. Awesome. **Ideas for Improvement** - An alternative view of the dashboard that displayed information in a linear fashion along with the peaks and dips. - Peaks and dips could be annotated in My Day. - Suggestions. For instance, it would be nice to say something like "Study for test" or "Nap" and have suggestions on when a good time to do that activity may be. - I would love some Apple Watch visibility and complications. **Next Level** - It would be nice to take some simple notes throughout the day and see a note icon on the dashboard repressing when that note was annotated. - A historical view would be nice that included any notes. - Sleep Debt. This would be 100% amazing. I realize it is a little out of scope, but for folks that track sleep debt, circadian rhythms are important.
Developer Response
Thank you very much for your thoughtful review, Ed! Great to hear that you appreciate Circadian. We really value your input and have added all your suggestions to our list of requested features. If you have any questions or further input please be in touch! See you outside, Bastian | Team Circadian
Great accountability & teaching tool!
cepoils
I’ve already started implementing some of the habits and lifestyle changes more in tune with a balanced circadian lifestyle. But this app helps keep me on track and accountable on days when I need reminders or suggestions on how to improve my habits such as eating to close to bedtime and reminding me to go watch the sunset. I already see an improvement in my energy and cognitive function. The app has subtle notifications like a bird tweeting to remind you of the next step in your day. You can adjust these to your preference and modify your schedule as you go. I highly recommend this app for anyone who cares about improving their health and wants to make it as simple as possible. I’m still on the free trial so may have missed this but 1 suggestion I’d make is to add a grounding feature in the routine options and for those who love to check things off their lists, add the option to check things off daily once completed. Overall, super impressed! Thanks!
Developer Response
Thank you very much for your comprehensive review! Great to hear that your energy and cognition improved already! And thank you for your suggestion as well. We will add the ability to add custom events soon, tracking features will come too but this is a bit further down the road. Any questions or further feedback please be in touch via in-app messages or send an email to support@circadian.life. See you out there! Bastian | Team Circadian
My second most used app!
htreitman
The creator announced this app just when I was at my wits’ end with trying to gather accurate and comprehensive information on my many circadian lifestyle questions. The articles I generally found online were either extremely superficial or scientifically way over my head. This app’s “Learn“ section alone is worth the price of the annual subscription to me. I am relying on the reminders “Circadian” sends me throughout the day to help me establish the habits I was confused about before, and a satisfying answer to the question “why?“ is always a click away. It is taking the burden of a lot of confusing research off my shoulders so I can focus on my priorities. The app creator welcomes feedback and at this stage is available to answer questions directly. (My most used app is my iPhone “Notes.” Then comes “Circadian.”)
Developer Response
Thank you so much, Helaine! Great that Circadian helps you implementing a natural lifestyle and answers your questions about circadian rhythms. That is exactly what we set out to do. It is exciting to see that Circadian is well received even in these early days. We are looking forward to turning Circadian into something truly amazing. And yes, we love feedback from all users. If you have any more ideas please be in touch. Lots of gratitude 🙏, Bastian, team Circadian
This version improves automated time updates and notifications.
If the times are not correct immediately upon update, please reload your location to force an update.
To reload your location, click your location at the top of the Dashboard or My Day, which takes you to the location settings.
There, manually load another location (make sure it is loaded by checking the dashboard), then reload your current location (autolocate or manual).
If you encounter any issues, please send us a message through the app.
Many thanks!
Team Circadian
Version 4.0.7
The developer, Circadian Limited, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Linked to You
The following data may be collected and linked to your identity:
Location
Identifiers
Privacy practices may vary, for example, based on the features you use or your age. Learn More
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
