Circadian: Your Natural Rhythm 4+
Daily planner & alarm clock
Circadian Limited
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- Free
- Offers In-App Purchases
iPhone Screenshots
Description
Take your health into your own hands. Sync to circadian rhythms and give yourself the edge. Sleep, wake, eat, exercise and think at the optimal time for your body.
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. Start sleeping, waking, eating, fasting, 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 your 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):
Monthly subscription: $1.99 - $2.99
Yearly subscription: $12.99 - $19.99
One-off purchase: $49.99 - $74.99
You can find the terms & conditions here: https://circadian.life/terms
Follow natures pulse.
Increase your capacity for life!
Download Circadian now.
What’s New
Version 3.1.0
This version introduces a new pricing structure and improved workflows.
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 support@circadian.life if you have any issues, feedback, suggestions or questions.
Mind your rhythm, mind your light
Team Circadian
Ratings and Reviews
Super useful
I love this app. Been using it nearly a year. It looks great, has a wealth of well researched information and actually makes a positive impact to your day to day life. I have offered feedback to the developers in the past and they are responsive and keen to hear from customers. I’m on the plus plan which gives me enough alarms and reminders for key elements to my day that adjust with the seasons - sunrise and sunset being the obvious ones, but others that you can set in relation to that are also extremely useful. I use it daily for when my eating window starts and ends, I have a reminder set to start cooking supper 90 mins before eating window stops, another to shut the chickens up 30 mins before sunset! More reminders to take a movement break for sedate work days. It’s massively improved my general health and energy levels. It has consistently helped through the seasons, most notably during the darker months to regulate blue light and to sleep well. This has impacted the rest of the family too, curiously, I guess just from me ensuring the house is dimly lit after sundown and we are eating in response to that too. Highly recommended for a big impact to your family’s wellbeing!
Developer Response ,
Thank you kindly for this extensive review! Wonderful to hear how Circadian is helping you and your family and is supporting you through the seasons. Fantastic that your health and energy have improved. Keep us posted on your Circadian journey. Best wishes from New Zealand. Mind your rhythm, mind your light ☀️
Doesn’t account for individual body clock
The app is based on following the sunlight cycle. I like how neatly it calculates everything and sets reminders for you. Potentially super useful BUT, and this is a deal-breaker for me, it takes no account of individual’s body clock giving the same recommendations to ALL people. Suggesting to wake up half an hour before sunrise might work perfectly for a lion chronotype, but is the worst recommendation imaginable for a wolf chronotype like myself, even with enough sleep I stay sleepy all morning if I wake up then. Equally, it doesn’t account for individual’s peak times making a generalised suggestion for all. Not good enough.
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Thanks for the informative reply from the developers. I will have to look into more data for this and perhaps experiment some more with my personal sleeping time. From my current understanding, there’s enough evidence to support the idea that chronotype is determined genetically, but I can see how external factors could play a large role in that too. In my case, I have been reducing most of blue light exposure after sunset even before being introduced to the app, which has had a great effect on my sleep, but I still feel much more energetic throughout the day when I fall asleep later and wake up after sunset, hence the trouble with app’s wake up suggestions. But I’ll give it another shot. Really enjoying the reminders about the breaks btw!
Developer Response ,
Thanks for your review, and apologies for any confusion. Circadian does shift the rhythm and peak times based on your wake time and can be used as an evening type.
The recommendations, however, are based on the optimal alignment with the local light & dark cycle, as the literature shows that morning types are much healthier, live longer, and have less overall disease risk than evening types. It is also interesting to note that late chronotypes seem to be largely driven by epigenetics (lifestyle, behavior, and environmental factors like artificial light at night), while true late chronotypes are rare.
Perhaps give Circadian another go to help improve the overall rhythmicity of your evening schedule. If you feel like it, you could experiment with a few suggestions, like blocking all blue light a few hours before bed, and see how that affects you. You might even get inspired to shift your schedule slightly earlier.
Thank you, and all the best!
Bastian | Team Circadian
A game changer!
Circadian is one of those apps that will come into your life and you won’t remember how you ever managed without it. I suffer with seasonal affective disorder (also known as winter depression or winter blues), so my circadian rhythm is very sensitive and gets easily upset when the days are very short or very long. This app is an incredibly useful tool in keeping me on a daily schedule without disregarding seasonal changes, which is what pretty much any other scheduling tool out there does. I love being able to set an alarm relative to sunrise. It makes it so much easier to plan my day in a way that I get enough daylight, that I eat and work at optimal times. This may sound trivial for people who aren’t much affected by the seasons, but it used to be a huge struggle for me. This winter so far has been much better than previous ones, and this app has made a substantial contribution. I cannot wait to see what new features you have planned!
Developer Response ,
Thank you very much for review. Fantastic to hear that Circadian supports in managing SAD and staying in touch with the seasonal changes. If you have any input, feedback or questions please do let us know. By the way, there is a great new full-spectrum light box available from SOLshine that can be super helpful when the days are short. You can find details in the products section of the app and on our website. Many thanks, Bastian | Team Circadian
App Privacy
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 based on, for example, the features you use or your age. Learn More
Information
- Provider
- Circadian Limited
- Size
- 100.3 MB
- Category
- Health & Fitness
- Compatibility
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- iPhone
- Requires iOS 12.0 or later.
- iPod touch
- Requires iOS 12.0 or later.
- Apple Vision
- Requires visionOS 1.0 or later.
- Languages
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English
- Age Rating
- 4+
- Location
- This app may use your location even when it isn’t open, which can decrease battery life.
- Copyright
- © 2023 Circadian Limited
- Price
- Free
- In-App Purchases
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- 33% Off Monthly Subscription £1.99
- Monthly Subscription £2.99
- 33% Off Yearly Subscription £12.49
- Circadian PLUS (yearly) 40% £12.99
- Yearly Subscription £19.49
- Circadian PLUS (yearly) £19.99
- 10% Off Monthly Subscription £2.49
- Lifetime Purchase - 33% Off £49.99
- 10% Off Yearly Subscription £16.99
- Circadian PRO (Lifetime) 40% £49.99
Supports
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Family Sharing
Some in‑app purchases, including subscriptions, may be shareable with your family group when Family Sharing is enabled.