Jane Feddersen

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About the Author

Jane Feddersen

Jane is a former DI student-athlete and lifelong health enthusiast. Since graduating from College of Charleston where she played both indoor & beach volleyball, Jane’s spent the last four years building her marketing career with experience in project and partner management. Outside of work, her nutrition certification, dog, travel and yoga flows keep her busy.

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Levels vs January AI vs Nutrisense: What’s the Best Glucose Tracker?

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Medically reviewed by:
Maryellen Dance, MS, LMHC

About Maryellen Dance, MS, LMHC

Mental Health Advisor

Maryellen Dance is a Licensed Mental Health Counselor (LMHC) with over 12 years of experience helping patients with substance abuse, domestic violence, anxiety, depression, trauma, and more. Maryellen is also trained in Eye Movement Desensitization and Reprocessing Therapy (EMDR) and is a psychology professor at Nazareth College. She’s regularly featured as an expert in a variety of outlets and is passionate about sharing evidenced based mental health information. 

Jane Feddersen

Medical Reviewer: Maryellen Dance, MS, LMHC

Glucose trackers are probably not on your radar unless you have diabetes, but you might be excited to learn about the benefits that CGMs could provide for some of us average Joes or health nuts.


Continuous glucose monitors (CGMs) track blood sugar levels, which can also be helpful for those seeking weight management, athletes, or anyone that wants to better understand how certain foods or activities impact their glucose levels and, therefore, their lives.  


We’re checking out three of the top glucose monitoring devices and corresponding apps that track glucose levels. We’ll give a thorough breakdown of CGMs, what they track and the science behind them, their efficacy, pricing, and whether they’re worth it.

What’s the best glucose tracker?

Most cost effective

Levels Health offers the lowest monthly price and price transparency at $199 per month + an additional $199/year for the annual membership. Their app interface is also the simplest, giving you the option to input just text (like “salmon and rice” or “HIIT workout” instead of macros or calories burned). The program also works with two kinds of CGM devices, the FreeStyle Libre and Dexcom G6. The Levels app doesn’t automatically connect to fitness trackers, but you can import your data directly from Apple Health or Google Fit.


Best guidance and support

NutriSense is one of the most evolved glucose-tracking programs, with personalized support and dietitian coaching. This is helpful for anyone wanting extra guidance and support in interpreting data to optimize your diet, exercise, and lifestyle, especially in the beginning with set-up. While they are the most expensive option, the feedback provided is invaluable, and their app is one of the easiest to use and understand, with constant updates based on user feedback.

What’s the best glucose tracker?

Best Glucose Trackers: Levels vs January vs NutriSense

Initial price1 month plan: $399$398 for first month (includes $199 annual membership)$288 for first month
Ongoing subscription price3 month plan: $299/mo

6 month plan: $250/mo

12 month plan: $225/mo
$199 per month-long CGM kit

+ $199/year after first year
Monthly: $28/mo

Annually: $120 ($10/mo)
Subscriptions includesCGM device, access to app & private FB community, 1 month free dietitian coaching, meal, sleep, exercise & stress trackingCGM device, access to app & private FB community, 1:1 nutrition coachingActivation kit (telehealth evaluation, starter CGM, and AI calibration), access to the January app
No additional trackers required?❌ Requires additional compatible activity tracker
FeaturesReal-time glucose data, connected app to track data and gain insights, dietitian coachingReal-time glucose data, connected app to track data and gain insightsGlucose data, AI projections, connected app to track food input
CGM device compatibilityFreeStyle LibreFreeStyle Libre Dexcom G6FreeStyle Libre
Access to Dietician?❌ Nutritionist
Insights offeredBlood sugar levels, personalized insights on the relationship of lifestyle and glucose, dietitian recommendationsBlood sugar levels, recommendations on nutrition and exerciseBlood sugar levels, glucose impacts of foods, nutrition recommendations
Activity tracker compatibility✅ Apple Watch, Oura, Garmin, Fitbit✅ Apple Watch, Oura Ring Gen 2 & 3, Fitbit

Why do you need a glucose-tracking device? 

Glucose tracking devices provide a way to carry out continuous glucose monitoring (CGM). These devices offer support within a diabetes management plan, yet they can also help people without diabetes to improve their health and learn more about their bodies, including:


  • Those at risk of pre-diabetes
  • Athletes
  • Busy professionals
  • People with concerns related to blood sugar like sleep or weight problems
  • Health-focused people
  • Those looking for new ways to control and improve their health


The food you eat is directly connected to the insulin hormone, which controls blood glucose (blood sugar). When not managed properly, it can result in high blood sugar, or hyperglycemia, which can lead to various health consequences. Through a healthy lifestyle, type 2 diabetes can actually be prevented or have the onset delayed, which is where glucose tracking devices come in.


But it doesn’t only have to do with diabetes. For anyone, when we eat carbs, the body breaks them down into sugar (glucose) that then moves through the bloodstream, thus the term “blood sugar.” When blood sugar increases in the body, the pancreas makes more insulin in response as a way to balance the blood sugar. Cells absorb the blood sugar, and the body uses it or stores it in the muscles or liver. 


This balance of blood sugar plays a role in overall health. It’s one of those behind-the-scenes processes that’s happening on a constant basis, impacting the way we feel and function. For instance, research has found that blood glucose and insulin are connected to sleep and weight. 


A CGM device can provide a better understanding of how food, physical activity, and blood sugar levels interact, which can be used to improve health on many levels. Tracking blood sugar can inform a healthier diet, the best times to exercise, better sleep habits, and ways to manage weight, such as through hunger training that times eating according to blood sugar levels. 


What exactly is a CGM?

A CGM is a wearable sensor device that generally goes on the arm and continuously tracks blood sugar levels and changes in real-time. It can see how glucose responds to various stimuli, such as food intake, exercise, stress, and sleep. 


These trackers allow us to monitor our blood glucose to understand our internal processes better and control our health. In the past, lancets or meters were used, which required painful finger pricking and handling blood. Modern glucose trackers make tracking blood sugar much less painful and more seamless by using technology like apps and AI to enhance the data and features.


The corresponding apps can work with other fitness trackers and metrics to track your heart rate, sleep patterns, activity, and more in real-time. Combined, you can receive recommendations based on your data to optimize your health and overall athletic performance, like when, what, and how much to eat, exercise, and more. 


Sound exciting?? Insightful?? You bet – the data seems almost endless, and continuing advancements can tell you insanely unique things like which kind of carbs affect you (rice could spike your levels, while they could do nothing to the next person’s), how alcohol or stressful situations impact you, and even sleep pattern or mood predictions based on trends over time.



Which glucose monitor is the best for me?

While the CGM reading devices themselves are the same (FreeStyle Libre or Dexcom G6), the apps and features that interpret the readings are different. What sets them apart from each other?


Levels Review

Levels puts a focus on metabolic health for people looking to improve weight, energy, appetite, and sleep. The idea is about being a healthier person through lifestyle. Through your subscription, you’ll receive CGM devices to continuously monitor your blood sugar in real time. 


  • Main focus: Your unique metabolism – nutrition, eating the right foods for your body, finding mental clarity, having the energy levels needed for workouts and beyond. The focus is not on diabetes, although one of the goals is to help people prevent health problems like diabetes. 
  • Price: $398 for the first month (includes $199 annual membership & 1mo CGM device), $199 per device delivery thereafter (monthly, bimonthly, or quarterly). If you choose to cancel your subscription, you’ll still have access to membership perks for the rest of the year.
  • App: Levels app, which helps you see and monitor your blood sugar information. The app builds insights based on studying your data and offers suggestions for lifestyle changes. 
  • Bonus feature: Levels gives the option to have one-on-one support with a “Levels-aligned nutritionist.” The 1:1 nutritionists you can access have a deep understanding of metabolic health but are also longtime users of Levels itself, so they understand how to use biomarkers (like glucose) to guide you with diet and lifestyle choices. 


Depending on how (or if) you’re already used to tracking food and movement, Levels could be a hit or miss for you. Their app lets you input your food and activity, but not specifics. This is great for someone who might not be used to tracking already, but if you prefer to track data like macros, you might want a more progressive app/program.


Levels CGM customer reviews

Life changingApple App Store
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“I started using Levels… and I keep coming back to them each time I compare it to similar companies. I recommend the app to all of my clients and family… The constant feedback from the app has been great, because it is feedback on the actual food you are eating and what may have caused any fluctuations… I highly recommend using Levels, it has been life changing and has helped me create a healthier lifestyle.”
Recommend Levels to my clientsApple App Store
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“As a nutritionist, I tried Levels so that I could refer my clients to a resource to support health optimization and weight loss. After months of trial, I was able to fine tune my already healthy diet to boost my energy, mood, sleep, hormones, and even some weight loss. Foods I thought were good for me were actually messing with my glucose levels! …Now all my clients use Levels when we start a program together. This helps me fast track customizing the right foods for them.”
Set up is worth itGoogle Play Apps
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“The initial setup requires some time and reading, but buying a CGM to datamine yourself is a considerable commitment that you should not expect to be a 1-step process. I've been online for a couple days at this point, everything is working as advertised, and the data I've had time to collect has already been super insightful. 👍”
Additional features make it worth itReddit r/Biohackers
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“I really like the Levels app, the Levels FB group, their website, and their support team, which you can email with or join one of their introduction Zooms for newbies. If I only was using the Dexcom app on my own I would not be learning as much at all. Levels generates an Rx for you, too, so, if you bring the monitor box to a pharmacy then the pharmacy can sell you a new monitor”

Review of January CGM

January also focuses on lifestyle and eating habits by monitoring blood sugar. It claims to be “the world’s first virtual continuous glucose monitor.” Virtual? How can CGM be measured without the device? The future: AI.


  • Main focus: Using a CGM for 2 weeks + fitness tracker (purchased separately) + data input to combine insights for AI recommendations going forward. This creates personalized assessments for each person’s unique health for estimations of your glucose curves after you continue to log the food you eat. 
  • Price: $288 for the first month ($260 activation kit + $28 for the first month of membership). Then $28/mo or $120/year ($10/mo) for continued membership. Price will vary if you decide to purchase any additional CGM devices to recalibrate, or continue with just AI.
  • App: January’s app shows glucose curve projections and the glucose impact of a variety of foods, helping people make better dietary choices. It gives insights like a personalized best time to stop eating before bedtime.
  • Bonus feature: The CGM is optional after 14 days (saving you $$). January’s AI uses data from those two weeks + AI for insights into glucose predictions and real-time data to align key behaviors around your metabolic health. 

Some people decide to recalibrate every so often with a CGM, but this is not necessary. Nonetheless, it may be helpful if something changes in your health or diet, allowing the AI to adjust to your ‘new normal.’ In addition to the CGM that’s part of the January program, you also need to use your own compatible activity tracker, such as a Fitbit or Apple Watch, which may not be accessible for some users.



January’s app is still in the beta phase, so we expect many updates to continue to enhance the product and the data for users. As we said, AI is the future, so we are excited to see how January evolves. But that being said, there aren’t many user reviews on the current iteration of January and its interface.



NutriSense Review

NutriSense is about maintaining better metabolic health by tracking glucose levels and following dietitian recommendations. It provides real-time, continuous blood sugar tracking through an arm CGM. 


  • Main focus: Optimizing your metabolism with data insights and personalized dietitian support for expert guidance and data interpretation to build sustainable healthy habits.
  • Price: 1-month plan is $399. If you choose to continue, they have 3, 6, and 12-month plans for $225-$299/mo, depending on subscription choice.
  • App: The app tracks glucose data from the CGM device to help you gain insights for health improvements.
  • Bonus feature: NutriSense includes a dietitian coach (free for your first month) for personalized recommendations. The dietitian helps you figure out what the blood sugar data means and what changes to make to improve your data and, consequently, your health and metabolism.

One of the things we loved about the initial health quiz for NutriSense to get an idea of your goals was their inquiry about what kind of coaching style you prefer. Everyone is different and is motivated by different things, and their recognition of this made it feel more personal. Their coaching styles range from friendly to motivator, educator, peer, or tough-love. 



NutriSense customer reviews

Valuable data I didn’t expectApple App Store
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“I thought it was kinda expensive, but I’ve been really impressed by the things I learned. Biggest surprise for me was how well my glucose correlates with sleep quality (using combined Apple Health sleep tracking)... Just an example of a major benefit to me from tracking glucose - I was able to adjust my diet and my sleep became more consistent… Highly recommend this app - even if just for a few months to gain new insight into what’s going on inside your body.”
Been using for 2 yearsApple App Store
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“NutriSense is the best healthspan tool in my arsenal. The feedback on the impact of my food, sleep, exercise, and stress choices is outstanding and provides me the accountability and tracking I need to always make optimal choices. I’ve been using the NS system for nearly two years and it’s the one thing I never want to be without.”
App keeps improvingGoogle Play Apps
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“Excellent support team. The UI is better now than when I started, in part because they listened and prioritized some changes.”
Learning so muchApple App Store
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“Very good product. Doesn’t hurt to put in, and it provides invaluable data. Learning about how exercise and meals spikes and crashes my blood sugar (anywhere between 40 and 200). Very glad I got this.”
Dietitian was super helpfulReddit r/Biohackers
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“I liked Nutrisense and chose them because the plan included 30 days of counseling from a Registered Dietitian. She was in constant contact and very helpful. Another great thing about Nutrisense is that you get to keep access to their app (which is great!) and your data forever.”

The Verdict – Which glucose tracker app is best for you?

All three options offer glucose tracking with an associated app that gives you insights to improve your health. These devices and apps are more focused on improving health than addressing diabetes. But which one is best for you? 


Levels offers the best monthly CGM subscription.

Levels offers the lowest monthly subscription price for CGM delivery at $199/mo, including access to their app and private FB community (which users love for feedback, group support of the device, and “biohacks”), as well as 1:1 nutrition coaching and 2 CGM devices delivered/month. They are also the only platform with the ability to connect to both the Dexcom G6 and Freestyle Libre CGM devices, giving you more flexibility and preferences.


Levels glucose tracking →


January’s AI technology is the most innovative.


While it hasn’t been around as long as the others, January has great potential with its AI technology. This is a great choice, especially for anyone who might not want to continuously wear a device, as it only requires wearing for the initial two weeks. After that, it uses AI technology based on your inputted data during the initial period, saving you money without needing to purchase monthly devices. The insight will help you manage your glucose levels and, in turn, your total health and well-being – from sleep and movement to food choices to help you feel and perform at your best.


January program →

NutriSense offers the most actionable feedback.

With NutriSense’s additional support from a dietitian, you can better understand what your glucose data means with actionable advice that’s personalized by a credentialed professional. While it is the most expensive option, NutriSense has been around for the longest, so their app, insights, UI, and continued technology developments provide the user with the best experience, along with personalized dietician feedback on the best changes for optimal glucose levels and health performance.


NutriSense pricing →


Frequently asked questions (FAQ)

  1. Go to LevelsHealth.com to get started.
  2. Choose your CGM: Manual scan or real-time scanning – real-time scanning is recommended (and the point of this article) but submits you as a participant in Levels metabolic health study. If you don’t wish to participate, you have to use the manual scanner.
  3. Choose subscription and delivery schedule of CGM device: Monthly, bi-monthly, or quarterly (no commitment, cancel anytime, free shipping)
  4. Create an account & check out.
  5. Receive access to Levels membership & delivery of CGM kit.
  6. Follow the instructions included with the kit to apply and activate the device and connect it to the app.

  1. Go to January.Ai to join. 
  2. Check your gear: must have iPhone 6 or later or any android phone and a wearable activity tracker to work with the January app.
  3. Choose a plan: $28/mo or $120 for a full year ($10/mo) + activation kit ($260 one-time charge).
  4. Create account.
  5. January will send your activation kit based on approval. 
  6. Set up the device and app with included instructions.

  1. Go to NutriSense.io to get started.
  2. Complete >10min health quiz about your goals. 
  3. Choose your program: 3, 6, or 12-month plan.
  4. NutriSense will send the sensor device if approved.
  5. Apply the sensor and connect the app according to the instructions once received.

Levels cost: $199 for an annual membership and $199 per month-long CGM kit. You can choose the frequency of these kits monthly, bi-monthly, or quarterly and can cancel your subscription at any time.


January cost: $288 for the first month, which includes the starter CGM, telehealth evaluation and AI calibration, as well as app access. After that, you can determine whether to sign up for a monthly ($28/mo) or annual plan ($120/year).


NutriSense cost: You can choose from programs of one, three, six, or 12 months that range in price from $199 to $350 per month. The price varies by the upfront commitment and subscription length, and NutriSense plans to release additional plans with discounted pricing.

Levels: Insurance does not cover the cost, and HSA and FSA funds cannot be used toward it. 


January: Health insurance does not cover the cost. January’s FAQs state that some providers reimburse for CGMs, but it can’t guarantee that yourt FSA or HSA will cover the cost.


NutriSense: Insurance does not cover NutriSense, but some FSA and HSA programs will cover it.

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About the Author

Jane Feddersen

Jane is a former DI student-athlete and lifelong health enthusiast. Since graduating from College of Charleston where she played both indoor & beach volleyball, Jane’s spent the last four years building her marketing career with experience in project and partner management. Outside of work, her nutrition certification, dog, travel and yoga flows keep her busy.

Learn more
Jane Feddersen

Jane Feddersen

Jane is a former DI student-athlete and lifelong health enthusiast. Since graduating from College of Charleston where she played both indoor & beach volleyball, Jane’s spent the last four years building her marketing career with experience in project and partner management. Outside of work, her nutrition certification, dog, travel and yoga flows keep her busy.

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