Lumen - Metabolic Coach 12+

Hack your metabolism


Designed for iPhone

    • 4.6 • 3.2K Ratings
    • Free


Do you want to take control of your metabolism, lose weight, and live a healthier lifestyle?
With Lumen’s personalized metabolic coach, you can!

Lumen is the world’s first device to measure whether your body is burning fats or carbs - in a single breath. Say goodbye to guessing and hello to real-time metabolic insights, tailored daily nutrition plans, and recommendations on what to eat and when.

With direct access to your metabolism at your fingertips, our features will guide you to speeding up your metabolism, keep you motivated to reach your health goals, and feel your best self.


Features include:
* Real-time metabolic insights to guide you on your journey
* Personalized daily nutrition plans
* Lifestyle recommendations for sleep, exercise, fasting, and more
* Customizable tracks to achieve your goals
* Healthy habit building
* Progress tracker
* Monthly cycle tracker
* An engaged community for support and discussions

This app integrates with Health apps to sync data on your activity and sleep.


At Lumen, we believe in a personalized approach to health. That's why we offer different plans designed to fit your unique goals, whether it's weight loss, fitness performance, or improving your metabolic health. With our progress tracker and healthy habit influences, you'll have the support you need to succeed.


By macro-tracking your meals, you can continue enjoying the meals you love with a new outlook and healthier relationship with food and yourself!


Lumen tracks your metabolism, but it’s also a powerful tool for managing your journey in nutrition, fitness, and overall well-being. The app includes interactive features to help you stay on track with your nutrition goals, such as meal planning and recipe suggestions.


Don't let energy levels hold you back from your workout goals. Lumen gives you real-time insights into your body's fuel usage, so you'll know exactly when to hit the gym and when to rest. Lumen levels will guide you on whether you have enough energy or need to fuel up before your workouts.


If you like talking science - we’ve been featured in peer-reviewed articles and building research ourselves. Lumen's technology has been scientifically proven to accurately measure metabolic fuel usage when compared to the gold standard (RER) for measuring metabolism in multiple validation studies.


Improve your knowledge with our informative library of videos from fitness experts, coaches, and nutritionists.


Every breath measurement will tell you what’s happening in your body. These insights help you maintain your motivation and give you guidance on how to hit your goals.

So, what are you waiting for? Download Lumen today and start your journey to a healthier, happier you! You'll have the support and guidance you need to take control of your metabolism and live your best life.

Lumen has been featured in Forbes, BBC News, TechCrunch,, Wired Magazine, Shape Magazine, and more

Winner of the CES 2019 Best Reviews Award | Listed in the Top 30 Best Devices CES 2019 | Esquire 2020 product award

Please note:
You must have a Lumen device to use this app. You can order your device from
While Lumen is not intended as a medical device, it is recommended to consult your doctor before starting any nutrition plan.

Interested in partnering with us? Get in touch with us

Join us and begin your Lumen journey today!

What’s New

Version 2.123.23 (1533)

Thanks for using Lumen! This update includes new features to keep you on track with your Lumen goals.

Ratings and Reviews

4.6 out of 5
3.2K Ratings

3.2K Ratings

sorikugurl ,

I’ve Tried Several Programs, But This One Is Different

At first when i heard about Lumen i rolled my eyes. It sounded like another too good to be true gimmick. Promising everything and delivering nothing. After being betrayed by Weight Watcher and Itrackbites. I had little hope that this would be any different. Still i decided to take a leap of faith and i was flabbergasted. I had never considered using my metabolism to lose weight, it was always smaller portions. Low fat foods. Cutting out this and that. But when I began to use Lumen it gave me real insight into what i was eating and when. Not to say it wasn’t definitely a learning curve. I had a lot of trouble in the beginning breathing in the device. It actually took about a week or more to finally get it down. So it does take some work. The only downside is unfortunately the price. However the good news is that you can get the device elsewhere, just make sure they have the activation key before you purchase it. You can track your food without the guilt or having someone shake their finger at you. It gives you your personal plan that allows you to still eat the foods you love and adjust the times you eat them. Never have i been so excited about a Health Journey with Lumen. I fully intend on making this a permanent change and lifestyle. If you have any questions please ask! The staff online are patient, kind and helpful people who truly are there to ensure you have all the tools you need to take a chance and make a change!

Developer Response ,

Thank you for this amazing review! We are glad to hear Lumen is helpful for you and assisting you to learn more about your body :) Best regards, The Lumen Team

nikishere ,

Loving my Lumen, but $$$

I had pretty much stalled with weight loss for months before I saw an instagram ad for this. I thought it was pretty pricey for only a year of the service, but as a low-carb eater I wanted an easier way to know if I was burning fats or carbs throughout the day. Lumen’s macro recommendations meant I needed to up my calories by 400 each day, which I thought was crazy but worth a try. I just finished my 2nd full week with Lumen and I went from the first week figuring out my new diet and blowing 4s and 5s (almost exclusively burning carbs after fasting) to my second week blowing mostly 3s (a mix of both fats and carbs), and today I blew my first 2 (mostly fats)! Since I’m aiming for weight loss, none of this really mattered if I didn’t see progress on the scale or in other measurements, but in 2 weeks I’ve lost 3 pounds. By eating a lot more of the right balance of macros. Keep in mind I had spent months eating less food and losing nothing, even gaining half of the time. I’ll keep using my Lumen until my subscription is up. I don’t think it’s necessarily worth a 2nd year because it’s so expensive and only provides one real measurement. After a year I’ll be used to the recommended routine and know how my body is burning carbs/fats after certain meals and workouts so I don’t see the point in spending that much money a 2nd time. If it was cheaper, I might keep it but the costs outweigh the benefits right now.

Developer Response ,

Hi nikishere,
Thank you for sharing about the journey that led you to Lumen and your progress. Keep it up! We are glad to hear how you are harnessing the insights from Lumen to achieve your wellness goals.
All the best,
The Lumen Team

Koakley ,


Until I started using this device I was so confused. Eat this, don’t ever eat that, you can eat this, oh don’t eat that when …. In menopause you genuinely feel like nothing works no matter how hard you try. Efforts I made 10 years ago would get some results but now nothing.
Then tracking macros! I had no idea how to begin.
With lumen, the first thing I learned was there are hidden carbs everywhere. I learned that certain things in my control can keep you from burning fat like sleep and over exercise and too much fasting. The Lumen shows you what effect each activity you do has on your metabolism.
My first two weeks I thought I would never get below 3 ( burning carbs and fat ) but I added a consistent workout to my routine and bam. 1s and 2s ( fat burning ). It’s amazing. I had been meal planning and working out here and there with little results for 7 weeks and lost 7 pounds. Week 8 and 9 using Lumen I am down 13. With just little tweaks. Amazing.

Developer Response ,

Hi There,

Thank you for the 5-star review!

It is great to see the progress that you have made on your Lumen journey thus far, keep it up.

All the best,
The Lumen Team

App Privacy

The developer, Metaflow, 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:

  • Health & Fitness
  • Contact Info
  • User Content
  • Search History
  • Identifiers
  • Usage Data
  • Sensitive Info
  • Diagnostics
  • Other Data

Privacy practices may vary, for example, based on the features you use or your age. Learn More

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