Circadian: Your Natural Rhythm

Natural Cycles

In-app purchases

About this app

🌟 OPTIMISE YOUR NATURAL CYCLES & BIORHYTHMS TO RISE, SLEEP, THINK AND EAT AT IDEAL TIMES
Do you ever feel out of sync with your natural cycles? Circadian is the leading circadian rhythm app and biorhythm app, not quite a sleep tracker but a routine planner. By tuning into your biorhythms and respecting your circadian clock, you’ll enjoy better sleep, balanced energy and a more vibrant natural life.

☀️ ALIGN WITH SUNLIGHT & SEASONS
Why dissect every sleep cycle with a generic tracker when natural cycles guide you best? This circadian app uses real daylight cues—sunrise, sunrise–sunset flow, UVA/UVB rise & set, solar noon and sunset—to set gentle sunrise alarm reminders and a calming sunset alarm. Trust your circadian clock to steer your daily planner and day planner in harmony with nature.

🛏️ BEDTIME ALARM CLOCK & BIORHYTHM CALCULATOR
Plan your rest with our bedtime alarm clock feature and robust biorhythm calculator. Anchor bedtime at dusk and wake revitalised with rise sleep reminders. Visit my circadian clock dashboard for personalised insights, then use our biorhythm calculator to fine-tune your rhythms. Studies confirm syncing to natural cycles outperforms any standalone sleep tracker.

🍴 EAT & FAST IN SYNC WITH NATURE
Intermittent fasting and time-restricted eating align best to daylight. Front-load calories at sunrise and close your eating window by sunset to support your natural cycles app. Use the routine planner or daily planner to schedule meals, then lock in healthy habits with reminders from your biorhythm calculator for sustained productive days.

🧬 THE SCIENCE OF CIRCADIAN RHYTHM
Built on Nobel Prize–winning chronobiology, this circadian rhythm app reveals how light, biorhythms and environment regulate melatonin, cortisol and vitamin D production. Discover why melatonin naturally rises at dusk, how morning sunrise alarm modes boost alertness, and why consistent biorhythms enhance wellbeing. Explore our in-app library for deep dives into melatonin, exercise timing and more to transform your natural life.

🌅 YOUR NATURAL ALARM CLOCK
Wake gently with the perfect sunrise alarm or morning alarm clock, then drift off with the circadian rhythm alarm clock. Customise your sunrise alarm intensity, set a clock alarm for key moments, and embrace the circadian rhythm alarm clock as your daily guide. Let the circadian clock orchestrate your sleep cycle and awaken you when you’re truly ready.

📒 DAILY & ROUTINE PLANNER
More than a clock, Circadian is your daily planner, day planner and routine planner. The integrated timetable organises work, workouts and rest around natural cycles, while my circadian clock tracks your progress and keeps you productive.

☘️ ENJOY TRUE RHYTHM & WELLNESS LIVING
As the ultimate natural cycles app and circadian app, Circadian empowers wellness living by honouring your circadian rhythms / biorhythms and embracing life in sync with the sun.

🗝️ KEY ASPECTS
• Natural cycles: dawn, sunrise–sunset, solar noon, UVA/UVB rise & set, and dusk
• Bedtime alarm clock & biorhythm calculator: optimise your sleep cycle and fasting windows
• Sunrise alarm & sunset alarm modes: gentle wake-up and wind-down cues
• Circadian rhythm alarm clock & circadian clock synchronisation: custom clock alarm settings
• My circadian clock dashboard: personalised insights and habit tracking
• Biorhythm calculator: synchronise meals, exercise and rest
• Daily planner, day planner & routine planner: map your days in a clear timetable
• Deep science: explore melatonin, cortisol, chronobiology and sustainable natural life

Ready to unlock better sleep, balanced energy and happier days?
Download Circadian today—your ultimate circadian app, biorhythm app and natural cycles app for lasting wellness living.

Ratings and reviews

This app helps me optimize my day and get synced with the circadian rhythm wherever I am. I definitely recommend. over time I have used the alarms less. I don't need one to wake up anymore, yay! there are quite a few tech bugs. the app has randomly reset itself a few times and all of my alarms and settings have to be redone. sometimes alarms go off randomly without me having turned them on or they'll go off at the completely wrong time.

I love the idea behind this. So much so that I did buy the full membership, so I own it forever now. Having said that, the app does seem really glitchy. After the second day I stopped receiving notifications. I emailed customer service and although the response time was good, the answer received was not helpful and did not solve my problem. I force stopped the app, which did seem to help for 12 hours or so, but as of right now, zero notifications. Not even alarms are going off.

Update - was emailed promptly about this issue, which is rare these days for apps. They corrected the issue within a few hours of me reaching out. I absolutely LOVE this app and have been using it for years. It really has helpede be more aware of my time spent inside, reminding me to get outside. A+ app and customer service Update erased my plan and settings, and is telling me I now have to pay a one time fee to use all the notifications that I previously used and paid for with my annual plan.

What's new

This version enhances the user interface, improves slider functionality as well as alarms and notifications, and addresses some bugs. We're actively working to improve Circadian. Feel free to contact us at [e-mail] if you have any issues, feedback, suggestions, or questions. Mind your rhythm, mind your light ☀️ Team Circadian