# MyCircadianApp — user reviews > 209 indexed App Store user reviews of MyCircadianApp by Sarah Kleiner Wellness, rated 4.90/5 from 264 ratings. - Source: https://appshunter.io/ios/app/mycircadianapp/id6538168795/reviews - App overview in markdown: https://appshunter.io/ios/app/mycircadianapp/id6538168795.md - Rating breakdown: 5★ 253 · 4★ 5 · 3★ 1 · 2★ 1 · 1★ 4 ## What do users think of MyCircadianApp? Overall sentiment: positive **Pros** - 🌟 Comprehensive features - 👍 User-friendly interface - 🌞 Helpful for circadian health - 📊 Detailed data and tracking - 🎨 Aesthetically pleasing design - 🔍 Useful lux meter - 🗓️ Convenient moon and sun tracking - 🏆 Life-changing for some users **Cons** - 🔍 Could use more educational content - 📱 Occasional glitches or bugs reported **Commonly reported bugs** - Login screen freezes - Incompatibility with older devices **Most requested features** - Ability to manually log sun sessions and vitamin D sources - Option to view upcoming day's sunrise/sunset times ## Newest reviews (17 of 209) ### 5/5 — Works Great! *2025-07-30, version 1.2.0* I love being able to look and know exactly when I should be outside. ### 5/5 — Literally Life Changing *2025-07-30, version 1.2.0* I was finding myself awake from 12-3 multiple nights a week and it felt like a slow death. Somehow I came across Sarah, her courses, and her app. So far I’ve only implemented the light suggestions using the app (makes it so easy) and I’m sleeping through the night again consistently. I can’t wait to start layering her other tips around nutrition, movement, etc! ### 5/5 — Don’t want to be without this app!!! Incredible!!!! *2025-07-30, version 1.2.0* This app (and Sarah’s classes) have a permanent spot on my iPhone! I’m a mom of six little ones born in just eight years, and I’m in my 40s — so I don’t say this lightly: Sarah’s circadian rhythm app and teachings have been life-changing. During my last pregnancy, I had less inflammation, a healthy (and manageable) weight gain, and no digestive issues — plus more energy than I’ve had in years. Postpartum recovery was incredibly smooth, quick, and I lost all the baby weight within four weeks without forcing anything. What’s surprised me most is how naturally my kids have joined in with the rhythms I’ve learned — and we haven’t had a sick visit in over a year. If you’re wanting to improve hormones, energy, or truly get the most out of the good food you’re already eating… this isn’t just helpful — it’s foundational. ### 5/5 — Love this app *2025-07-30, version 1.2.0* Really enjoying using this app to help kick start my journey into circadian health. ### 5/5 — Circadian Rhythm *2025-07-30, version 1.2.0* This app has helped me be more intentional with getting the right kind of light from the sun at the optimal times for the best health benefits. I am still learning about UVB, UVA, and so much more…but it has helped me to track sunlight all throughout my day. Thank you for creating this app! ### 5/5 — Best circadian app out there *2025-07-30, version 1.2.0* A great, easy to use app that’s packed with information. I’ve tried a few of the others out there and this is definitely the best one! ### 5/5 — A must-have for sunlight seekers, even on cloudy days! ☀️⛅️✨ *2025-07-26, version 1.2.0* As someone with very fair skin and a deep commitment to optimizing health naturally, MyCircadianApp has been an absolute game-changer. 🌞 The Vitamin D tool has especially blown me away! It gives me precise, personalized guidance for when and how long to be in the sun based on my skin type (I’m a Fitzpatrick Type I), UV index, cloud cover, and more. I live in a region with frequent overcast days, and I was always unsure whether I was actually absorbing any Vitamin D and now I finally have clarity! I also love that I can see exactly when the UVA & UVB windows are, and Sarah so beautifully explains the benefits of both types. What I love most is how the app empowers me to: • Get safe, effective sun exposure without burning • Plan my outdoor time with intention and rhythm • Align with my body’s natural light cycles in a way that feels nourishing and intuitive It’s not just another tracker, it’s a wellness compass. 💛 I feel more energized, more aligned, and more informed than ever before. Grateful for this tool, and highly recommend it to anyone wanting to build a deeper relationship with the sun and their circadian rhythm. ### 5/5 — Life Changing Simplicity of a Sunlight App *2025-07-25, version 1.2.0* I started using Sarah’s MyCircadian app in November 2024 after months of unexplained fatigue that no medical advice could shift. Within three weeks of following the app’s daily sunlight guidance, I felt like myself again, clear-headed, energised and hopeful. The app’s intuitive sun session timer and real-time UV tracking helped me get outside at the right time, every day and supported me eating within daylight hours. It wasn’t just about vitamin D, it was about syncing with nature in a way that finally made sense to my body. My daughter is following my leads to & it has helped her immensely. I now use it daily and recommend it to everyone, especially alongside Sarah Kleiner’s podcast and resources. Her insights into circadian biology gave me the tools to take control of my health when nothing else worked. The support team has been incredibly responsive and genuinely caring, making the whole experience even more empowering. This app didn’t just help boost my health, it helped me restore something I didn’t realise I’d lost. I’ve rediscovered my love for being outside in the sun, without fear. I’d forgotten how good felt. Thank you ### 5/5 — So much to LEARN! *2025-07-24, version 1.2.0* During my 2 week trial, I found it uber useful for timing my morning Vit D &sun exposure times. I especially appreciated the direct links to the many articles and videos to learn more about circadian rhythm and the link to menopause. Extremely useful for anyone with Hashimoto’s Thyroid or auto immune issues. Seriously thinking about getting the paid version—worth it!!!🙌🙏💖 ### 5/5 — Love this app *2025-07-24, version 1.2.0* I used to use dminder, but always felt that it was a bit basic and could use more features. Then I found MyCircadian, which has really taken things to the next level! It’s very helpful having sunrise time, the degree of the sun, sun sessions, and honestly everything else. The layout is intuitive too! ### 5/5 — The Best! *2025-07-24, version 1.2.0* Sarah Kleiner Wellness is one of THE BEST influencers I follow! So much helpful practical & common sense information that’s completely transformed my sleep. I’ve learned so much AND I Love this app! ### 5/5 — UVA/UVB Tracker *2025-07-24, version 1.2.0* Lots of great features! I love that it makes it possible to track when UVA & UVB light is available. ### 5/5 — I didn’t know I needed this! *2025-07-24, version 1.2.0* Sooo much in this app to help get tuned in with your circadian rhythm. Only a few days in and already I’ve gotten way more time outside, getting Vitamin D while it’s available, and I’m way more aware of natural rhythms of the day/night light. And so many videos and opportunities to learn more embedded. I love having the reminders and will be paying for the upgrade! Thank you Sarah and team- this app hits it out of the park! ### 5/5 — I use it EVERY DAY! *2025-07-24, version 1.2.0* I use this app every day! To check sunrise times, sun angle when I’m out, to determine when I need to go back outside, and sometimes to check lumens in different places and different weather conditions. It’s SO helpful! Thank you, Sarah! ### 5/5 — Lux Meter!! *2025-07-24, version 1.2.0* I love the Lux Meter! It is the what sets this App apart from others. Sarah’s explanation and education on Lux is so valuable in understanding the importance of being outside even on cloudy days. I also love the reminders based on my location :) ### 5/5 — Eye Opening! *2025-07-24, version 1.2.0* This App is AWESOME! It’s gives you a quick comprehensive view of all the benefits you can soak up from the sun — and when to do it. It’s been so helpful to find all the information I need to nurture and heal my circadian rhythm in one spot. Learning to utilize light has made a huge shift in my weight, energy, quality of life and health overall. So thankful for this resource and all the information Sarah shares! ♥️ ### 5/5 — Simple and effective *2025-07-24, version 1.2.0* The app makes it very easy to know through your the day what light you are getting. I love being able to quickly glance at it and know the best time to be in the sun ## Most critical reviews (10 lowest-rated) ### 1/5 — Life Changing *2024-11-05* Sarah Kleiner recently created an app called, MyCircadian App, and it has changed my life. From birth, I’ve been an insomniac. This lifelong, severe sleep deprivation has been life altering. I’ve lost years of my life to exhaustion, brain fog, memory issues, and severe pain & inflammation due to dysregulated cortisol levels. Many years ago I was diagnosed with “circadian rhythm disorder.” Why do I have this issue and what can help me, I asked. The medical doctors/specialists admitted they had no answers for me. The popular medications for sleep did not help me fall asleep. They did not regulate my sleep-wake cycle. I was still falling asleep everyday between my usual 4-5am time frame. The pharmaceuticals left me waking up tired, groggy, unrefreshed, and with a new medical nightmare—addiction to the drugs that were suppose to be helping me. Melatonin, popular supplements used for sleep, and herbal products did not move the needle. Finding Sarah Kleiner’s Instagram account & learning about my light diet has been life changing FINALLY in the best way! Finally at 55 years old, the struggle to simply fall asleep & stay asleep & wake up at a somewhat normal time is finally happening! The MyCircadian App provides me with all the information I need to manage & optimize my light diet. MyCircadian App is simple to read & understand & finally, for the 1st time in my lifetime, I know when to get outside at those special times of the day to continue healing my mind & body. Thank you Sarah Kleiner for this brilliant idea and for pouring yourself into this creation. Your dedication has been & is changing my life and I am finally beginning to have a life. I wish we could meet in person so I could give you a big hug. ### 3/5 — Contact does not work…. *2026-06-12, version 1.3.0* Overall this app is stellar. Although, when attempting to make contact with developer no link works here. Simple question: Does the app have ANY alarm clock functions, like wake up to see Sunrise, when UV-A & UV-B is available??? Please fix your links. The link gets you to a page, but no link works after that. ### 3/5 — No idea what is going on with this app. *2026-04-28, version 1.3.0* But there’s no way the max UVI is 5 here in Lagos today. It would appear following this app will lead to getting burnt and quick! ### 4/5 — Helpful and informative app *2025-07-28, version 1.2.0* This app is nice and easy to start using, comes with plenty of explanation on what each section of the dashboard is for. I was amazed at the difference in lux levels between a bright fluorescent light and sunlight. It also has links to some good resources / information. I recommend getting the free guide to the perfect circadian day from the website to help understand the why and how to feel better paying attention to your light environment. I need this app in New Zealand as our UV index is very high in summer, so it’s often a matter of minutes between healthy sun and burning. It works well and fast, it’s attractive visually, and it has a beautiful simple moon phase section. I did not give it the 5th star because I found the format of the resources/articles/videos very difficult to navigate, they are on a scrolling carousel display, and I can’t keep up reading the title before it moves to the next. Just a list of links would be fine! It works fine, just hard to read. I also had trouble understanding that logging a sun session can only happen when there’s UV windows. Took a bit of time to work that out (that’s mostly user error). These are VERY minor complaints, please do not let these stop you from downloading it. ### 4/5 — Location tracking optional *2025-01-17, version 1.1.0* So excited to use and track my “rhythm” here. App seems very user friendly and straight forward! ### 4/5 — Love estimating lux on this Dashboard for light. *2024-11-05, version 1.0.4* I love how this functions as a dashboard for light. The lux meter is not perfect, of course, but at least it allows you to estimate how much light you’re getting. The only thing I’m depressed about is that it said I won’t get vitamin D for another 126 days. ### 4/5 — Love it but would be great to be able to manually log sun sessions + vit D food sources *2024-10-12* Overall awesome app. One thing to make it perfect would be to be able to manually log sun sessions, sperti vit D sessions and vit D food sources (trout, salmon, cod liver oil, etc) so we can get a more accurate sense of our vit D levels similar to what the dminder app does. **Developer response:** We just added this feature in the latest update - but it’s important to understand that an app cannot accurately keep track of blood levels of vitamin D as many factors like BMI - infections & genetic mutations can impact this. ### 5/5 — Amazing!! *2026-08-24, version 1.5.0* I've never ever written a review for an app before, but this one deserves it! This app has been incredible with so much information. I've really gotten into circadian health and trying to understand it. Sarah's app, along with her IG and all of the resources she gives, has been so valuable in my journey. I have the paid version and it is worth every cent, with SO much information! Even the free version is helpful, but the paid is top notch! ### 5/5 — Wonderful App *2026-07-02, version 1.4.0* This app is the best for tracking all the important aspects of circadian rhythm to maintain a circadian lifestyle! I have been using it since it launched and it keeps getting better! Great job SKW!!! ### 5/5 — 🌞the LIGHT and the WAY🌞 *2025-08-01, version 1.2.0* Shout-out to Zaid Dahhaj who recommended this app! A practical tool - the Swiss Army knife of sunlight tracking apps! Has all the necessities while keeping it simple. Let this app guide you back into circadian alignment. Good health and longevity depends on it. Do your own research, you’ll find we’ve been kept in the dark about the healing properties of the sun! Understand, the sun is to be respected and received in proper order. This app will enable you to abide by the sun in the right timing, dose and context. This app is now my trusted daily companion! Gave the free trial a chance [the paid full access version] - its additional features are worth the expense if one can afford it. Like having the ability to log accumulated Vitamin D exposure within the app is helpful for someone with health issues, like me, who needs to monitor it closely over the coming months. Sarah also provides important education thru her app, always more to learn. Check-out Zaid Dahhaj’s Solar Callus Guide to complement this app! Consider, who is there for you everyday of your life…day after day without fail? Who nourishes the whole earth with its intelligent rays? Not a mystery, look up! Plain to see. Thanks and Praise to RA! The very LIGHT and The Way🙏🏽 🌞🌞🌞 🌞🌞🌞 🌞🌞🌞 ## Most praised reviews (7 highest-rated) ### 5/5 — An App I Didn’t know I needed! *2025-08-01, version 1.2.0* I’m just beginning to learn about the importance of circadian rhythm so this handy little tool will be awesome to have! ### 5/5 — Unexpectedly Useful *2025-08-01, version 1.2.0* I’ve been implementing a lot of circadian aligned lifestyle changes since finding Sarah Kleiner and this app makes it so much easier to do. I know exactly when I need to get outside so I’m able to plan my mornings with ease and get the maximum benefit from the early sunlight. The app is visually pleasing, easy to use and includes pretty much every feature you could possibly need. I use it multiple times a day every single day. ### 5/5 — Best app for circadian rhythm! *2025-07-31, version 1.2.0* This app has been so helpful for me as I have been working on my high leptin levels. It lets me know when I should be outside in the morning and when it’s best to go outside for my midday sun! The Lux meter is AWESOME for finding the right balance of light at night! ### 5/5 — Great tool for circadian alignment *2025-07-31, version 1.2.0* The Lux meter is especially useful. I appreciate that you can also see the sunrise, sunset, and UV rise times a week ahead, too. Great app! ### 5/5 — Light was the missing piece *2025-07-31, version 1.2.0* I have serious histamine intolerance that I’ve been trying to manage for years. In the last year I noticed if I was on my phone too much in the mornings, I was destined for a flare up. Now, with the information from Sarah Kleiner I can see when UVA rays are available and I recently realized that getting UVA rays MAKES MY FLARE UP GO AWAY. Thanks to this app, I’m locked in on when and how to utilize light for my health. I can’t wait to try it out during winter to see how much Vitamin D I am getting as well. Love the app, and I highly recommend. ### 5/5 — Best Sun Exposure and All Around Circadian App! *2025-07-30, version 1.2.0* I’ve been using MyCircadian to track my Vitamin D/sun exposure to see how it affects my sleep and energy. The app is very user friendly and well designed. As a super visual person I like all the colors and easy to see exactly when UVB starts and ends and also when set rises and sets. There’s a free “Build your perfect quantum day” and other free videos so overall it’s just such a good app and now replaces the one I use to use. HIghly recommended! ### 5/5 — Game Changer *2025-07-30, version 1.2.0* Sarah knocked it out of the park with this one! This is my most used app, utilizing it several times a day. I’ve completely transformed my health by getting the right light at the right times of day. Thanks Sarah! --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-29.*