Circadian Rhythm & Sleep: ARC

Circadian Rhythm & Sleep: ARC

Energy, Caffeine & Body Clock

8 ratings
4 reviews
Free
In-App Purchases

Details

Released
February 5, 2026
Updated
October 3, 2026

Features

Circadian Rhythm & Sleep: ARC screenshot #1 for iPhone
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Circadian Rhythm & Sleep: ARC screenshot #6 for iPhone
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About

Align your daily activities with your natural biological rhythm for improved energy, focus, and sleep. This app diagnoses your chronotype and provides personalized recommendations for work, caffeine, and light exposure.

✓15-Point Precision Diagnosis
✓Bio-Diagnosis for Chronotype
✓Circadian Compass energy map
✓Caffeine Half-Life Tracker
✓Photon Latency Nudges
✓Energy-Based Mission Scheduling
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What's New in Circadian Rhythm & Sleep

2.0.1

October 3, 2026

• Widgets now follow your phase through the day, even with the app closed • Home's daily sentence reflects what you actually did today • Trends shows what it's still measuring, and keeps every experiment result • Cutoff and peak hours follow your 12/24-hour setting • Fixes for notifications, widgets and German text

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Subscriptions & In-App Purchases

ARC Yearly Pro

Unlimited access to all circadian protocols

$39.991 Year
7 Days trial
How to cancel Circadian Rhythm & Sleep subscription ⁉️

User reviews

Very strong subscription binding!

The autumn application strongly imposes its paid

Subscription, which has a very negative impact on the experience of using the application.

5 Stars for Potential

I’m giving this five stars for potential and because it serves a niche in the market that is very much needed. However, it is a bit off for me. I’m a wolf type. Already knew that. Being a wolf type my lifestyle is already built around my DSPD so my schedule does not configure to your typical 9-5. That being said, the app quiz still forced me to answer questions about peak energy and coffee timing based on a 9 to 5 schedule. I thought the whole idea of this app was that I would not have to answer questions as though I have a typical schedule. So for some reason, it thinks I have my first coffee at 3:30 AM, which is an hour before I told it I usually go to sleep. Seems like a bug? I also would like the ability to switch from UK (military) time to U.S. time.
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Response from developer

You're 100% right, and we fixed all three. The 3:30 AM coffee bug was a hardcoded "AM" that ignored your actual wake time. The quiz now uses relative timing ("a few hours after waking") instead of fixed clock times. And we've added a 12h/24h toggle in Settings. Rolling out in the next few hours. Thanks for flagging these. Wolves with DSPD are exactly who ARC should serve best.

Know your body!

I must say I didn’t pay much attention to my circadian rhythm but it’s nice to know about how my body works and also what the optimal time it is to drink coffee and when to cut it off so it doesn’t affect my sleep. It’s a good little reminder to help stay in tune with your body!

Response from developer

Really glad that it helped you in your busy life. Keep your circadian rhythms healthy and enjoy ✌️

Essential for a night shifter

As a night shifter trying to stay consistent has its ups and downs, where this maps out your day, when you shouldn’t have anymore caffeine and such to try and optimize your circadian rhythm. This isn’t JUST for night shifters and it’s for everyone. Even if you are on a standard 9-5. It helps people create better habits for longevity of a circadian rhythm.
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Response from developer

Thank you so much for this so positive review

Developer apps

FAQ

What is ARC's subscription pricing?

ARC Pro offers weekly at $3.99, monthly at $9.99, and yearly at $29.99. The yearly plan provides the best value, saving users 75%.

Does ARC offer a free trial?

Yes, all ARC subscription plans include a 3-day free trial. You can manage your subscription and cancellation through your App Store account settings.

How does ARC diagnose my chronotype?

ARC uses a 15-point precision diagnosis during onboarding, asking specific questions to calibrate your rhythm with medical-grade accuracy and identify if you are a Lion, Bear, Wolf, or Dolphin chronotype.

What are the science-backed results users can expect from ARC?

Users can expect to eliminate the afternoon energy crash, fall asleep faster by timing wind-down routines, and achieve states of deep flow by working with their brain chemistry.

On which devices can I use ARC?

ARC is supported on iPhone, iPad, and iPod devices, making it accessible across the Apple ecosystem.

How often is ARC updated?

The latest version of ARC is 1.2.0, and it was last updated on March 15, 2026. This indicates a commitment to ongoing development and improvements.

What is the age rating for ARC?

ARC has an age rating of 4+, making it suitable for a wide range of users interested in health and wellness.

Does ARC have ads?

No, ARC does not contain advertisements. The app is free to download and offers in-app purchases for its Pro features.