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Whether you’re newly diagnosed or have been managing diabetes for years, chances are you’ve heard about popular continuous glucose monitor brands like Dexcom and Abbott FreeStyle Libre. With so many CGMs available, it may feel overwhelming to pick the right one. As a trusted provider of diabetes supplies, Advanced Diabetes Supply is staffed with Certified Diabetes Care and Education Specialists who are extremely knowledgeable about CGMs. Our professionals are well-versed in diabetes care, including type 1, type 2, gestational diabetes, as well as prediabetes and hypoglycemia. Continue reading our continuous glucose monitoring brands buyer’s guide to compare features, benefits, and find which system best suits your preferences.
Why Use a CGM
Continuous glucose monitors (CGMs) have transformed diabetes care. CGM users may feel more confident about effectively managing their blood sugar levels without the need for frequent fingersticks. This is especially convenient during mealtimes and when working or traveling.
Adding a CGM into your diabetes care regimen may provide a host of benefits. We’ve highlighted a few below:
- Real-Time Glucose Monitoring: CGMs continuously measure blood glucose levels throughout the day and night so you can track your levels in real-time.
- Alerts and Notifications: Many CGMs notify you when your blood sugar level is outside the normal range. Certain models provide predictive alerts which let you know when your blood sugar is beginning to drop or rise, so you can take action to avoid extreme lows and highs.
- Improved Safety While Sleeping: Since CGMs work while you sleep, you can rest easy knowing alerts will wake you up if your blood sugar gets to a dangerous level.
- Less Fingersticks: Thanks to real-time glucose monitoring, you won’t need to test via fingerstick as often. Fingersticks are still required during warm up periods or when symptoms do not match readings.
- Use Data For Health Insights: Did you know you can easily share your CGM data with your physician? Doctors use CGM data to see how your blood sugar responds to meals, activity, or medications. For example, if they notice consistent spikes after breakfast, they may adjust your morning insulin or suggest different foods. They may also review nighttime lows you might not feel, prompting changes to your evening medication or snack routine.
- Easily Share CGM Data: Family and caregivers can get access to CGM insights, notifications, and alerts too.
- Peace of Mind: For many, incorporating a CGM into their care regimen increases confidence, reduces stress, and creates overall peace of mind.
How Do CGM Systems Work?
CGM systems work by measuring the glucose levels in the interstitial fluid between cells. Those metrics are then sent to a device or app, providing real-time glucose readings, trends, and alerts. Most CGM brands include three essential components:
- Sensor: A tiny filament inserted into the skin based on the manufacturer’s instructions for use (typically on the back of the arm or the stomach). This component measures your glucose levels at regular intervals.
- Transmitter: A sensor subcomponent which is responsible for sending blood glucose levels to the receiver.
- Receiver (or reader): A standalone device that displays data recorded by the sensor. (In some CGM systems, a compatible smartphone may be used).
Continuous Glucose Monitoring Brands
While most CGM brands have the components mentioned above, each system offers unique features, strengths, and limitations worth considering. Continue reading to see a breakdown.
Dexcom
Dexcom is commonly-known among CGM brands. The G7 is Dexcom’s most recent and most advanced continuous glucose monitor. It is ideal for patients two years and older living with type 1, type 2, or gestational diabetes. The G7 is approved for the same group of individuals as the G6. New features on the G7 include a smaller size, shorter warm-up time, and improved accuracy. To learn more about how these CGMs compare, refer to our Dexcom G6 vs G7 Guide.
Dexcom G7 System Features
- Approved for use in individuals managing diabetes 2 years and older
- 10-day sensor lifespan
- Compatible with Omnipod, Tandem t:slim X2, Tandem Mobi, and iLet insulin pumps.
- Small sensor
- Sensor worn on upper arm or upper buttocks
- 30-minute warm-up time
- Glucose readings every 5 minutes
- All-in-one sensor and transmitter
- Available with receiver
- Pairs to smartphone
- Must have a prescription
| Pros | Cons |
| Highly accurate readings* | Sensor needs replacing after 10 days – Not including a 12-hour “grace period” |
| Dexcom’s smallest sensor, roughly 60% smaller than previous sensors | Smaller adhesive patch comes with an increased risk of falling off |
| Alerts for upcoming highs and upcoming lows | |
| Extra-comfortable sensors† | |
| Displays readings on a dedicated receiver, smartphone‡, or smart watch¶ | |
| Half-hour warm-up time | |
| Automatic readings every five minutes |
Dexcom Stelo Biosensor
The Dexcom Stelo is the first over-the-counter biosensor. While designed for use in individuals living with type 2 diabetes or prediabetes, anyone can use the Stelo. It is approved for use in adults who are not taking insulin. Glucose tracking can provide insight into how your body responds to certain foods, helping you personalize meal plans for overall health.% The Stelo is a small biosensor worn on the back of the arm that communicates data directly to an app on your smartphone. Unlike the other sensors in this guide, this is the only one available without a prescription.
Dexcom Stelo Features
- Small sensor
- 15-day wear time
- No receiver needed; sends data directly to your smartphone
- User-friendly
- Available without a prescription
| Pros | Cons |
| Available without a prescription | No alarms for highs or lows |
| Designed for non-insulin users | Less detailed data insights |
| Small, discreet size | Cannot be manually calibrated |
| Easy smartphone compatibility |
FreeStyle Libre by Abbott
FreeStyle Libre is manufactured by Abbott, which manufactures the thinnest and most discreet sensor. ^^ These CGMs are approved for use in individuals with type 1, type 2, and gestational diabetes.
Freestyle Libre 3 System
The Freestyle Libre 3 is the most advanced CGM system from Abbott. It is approved for use in adults and children 2 years and older with the Libre 3 Plus sensor.
*Libre 3 sensors were discontinued in Sept. 2025. They are replaced by the new and improved Libre 3 Plus sensors. If you are already using the Libre 3 system, there is no need to purchase a new system. However, you likely will need a new prescription to upgrade to the Libre 3 Plus sensors. Libre 3 users may continue using their Libre 3 reader or smartphone and Libre 3 app. Unlike the Libre 3 sensor, the Libre 3 Plus sensor is compatible with some insulin pumps, has a 15-day lifespan, and is available to younger children, starting at the age of 2.
Freestyle Libre 3 System Features
- 15-day sensor lifespan
- Small sensor
- Compatible with iLet Bionic Pancreas and twiist™ insulin pumps
- Takes glucose readings every minute
- Must have a prescription
- Available with reader
- Pairs with smartphone
| Pros | Cons |
| 15-day sensor lifespan | 60-minute warm-up time |
| The smallest||, thinnest# CGM sensor ever made | Reader must be recharged every seven days |
| Real-time glucose alarms | Readings can be affected by vitamin C |
| Sends readings directly to users’ smartphones | |
| Compatible with the FreeStyle Libre 3** and LibreLinkUp† apps | |
| Compatible with select insulin pumps |
FreeStyle Libre 2 System
The FreeStyle Libre 2 is the predecessor to the Libre 3. With Libre 2 Plus sensors, it is approved for use in adults and children 2 years and older.
*Libre 2 sensors were discontinued in Sept. 2025. They are replaced by the new and improved Libre 2 Plus sensors. If you are already using the Libre 2 system, there is no need to purchase a new system. Libre 2 users may continue using their Libre 2 reader or smartphone and Libre 2 app, as they are compatible with both Libre 2 and Libre 2 Plus sensors. However, you likely will need a new prescription to upgrade to the Libre 2 Plus sensors.^ Unlike the Libre 2 sensor, the Libre 2 Plus sensor is compatible with some insulin pumps, has a 15-day lifespan, and is available to younger children, starting at the age of 2.
FreeStyle Libre 2 System Features
- Compatible with Tandem t:slim X2 and Omnipod 5 insulin pumps
- Available with reader
- Pairs with smartphone
- 15-day lifespan
- Takes glucose readings every minute
- Small sensor
- Must have a prescription
| Pros | Cons |
| Sensor/transmitter has a 15-day lifespan | Reader needs to be charged every 7 days |
| compatible with FreeStyle Libre 2 app ‡‡ | Taking more than 1000mg of Vitamin C per day may affect glucose readings |
| updated readings each minute ¶¶ | |
| Sensor memory storage is 8 hours | |
| Real-time glucose alarms§§ |
Choosing the Right CGM Brand For You
We hope our continuous glucose monitoring brands buyer’s guide helps you in your search for the perfect CGM. Remember, your healthcare provider remains your trusted partner in navigating this decision. Discuss the insights gleaned from this guide and their expert recommendations to find the perfect CGM for you. Where you get your CGM is also important. In fact, where you get your CGM may make a big difference in how successful you are with it. Unlike most pharmacies, DME suppliers like ADS offer personalized education, hands-on support, and ongoing guidance to help you get the most out of your device. From setup to everyday use, ADS is here to make sure you feel confident and supported at every step. Choosing ADS means choosing a partner in your care.##
CGM Brands FAQs
What is the best CGM for Type 2 diabetes?
The Dexcom G7 and FreeStyle Libre 3 are both popular CGMs for individuals living with type 2 diabetes. For those who are not taking insulin, the Stelo bio sensor is an option.
What is the most accurate glucose monitor?
The Dexcom G7 15-day sensor is currently the most accurate glucose monitor on the market.+
Do I need a prescription to buy a continuous glucose monitor?
Yes, you need a prescription from your doctor to purchase a continuous glucose monitor. However, the Dexcom Stelo is available without a prescription and intended for use in individuals who are not taking insulin.
Can I use a CGM for prediabetes?
Yes, CGMs may be available depending on your insurance requirements.
Who should use a CGM?
Depending on the CGM, these devices are for individuals living with type 1, type 2, and gestational diabetes, and may be suitable for some individuals with prediabetes. Insurance companies may require patients to have certain covered diagnoses.
Can I get a CGM online?
Yes, it is easy to get a CGM online. Once you have your prescription from your doctor, simply head to our continuous glucose monitors product page, select your preferred system, and fill out the corresponding information. If you have any questions along the way, give us a call, we are happy to help.
CGM Brands Available at ADS
ADS, US MED, and Edgepark have come together to form one trusted source for diabetes supplies. By combining our expertise, we’re delivering the best in service, support, and top-quality products—all in one place. Collectively we offer all the CGMs featured in this article, as well as other essential diabetes supplies like insulin pumps and testing supplies. Best of all, you’ll get fast shipping and top-notch customer service no matter what you buy. If you have any questions about continuous glucose monitoring brands, diabetes supplies, insurance, or more, reach out to us. We’re happy to help.
References
*Dexcom, data on file, 2022.
†Dexcom, data on file, 2020
‡To view a list of compatible devices, visit dexcom.com.
¶Smart device required to display readings on watch.
§FreeStyle Libre 3 User’s Manual.
||Data on File. Abbott Diabetes Care.
#Among patient-applied sensors.
**The FreeStyle Libre 3 app is only compatible with certain mobile devices and operating systems. Please check Abbott’s compatibility guide for more information about device compatibility before using the app.
††The LibreLinkUp app is only compatible with certain mobile devices and operating systems. Please check www.librelinkup.com for more information about device compatibility before using the app. Use of the LibreLinkUp app requires registration with LibreView. LibreLinkUp is not intended to be used for dosing decisions. The user should follow instructions on the continuous glucose monitoring system. LibreLinkUp is not intended to replace self-monitoring practices as advised by a physician.
‡‡The FreeStyle Libre 2 app is only compatible with certain mobile devices and operating systems. Please check Abbott’s compatibility guide for more information about device compatibility before using the app. Use of the FreeStyle Libre 2 app requires registration with LibreView.
¶¶FreeStyle Libre 2 User’s Manual.
§§Notifications will only be received when alarms are turned on and the sensor is within 20 feet unobstructed of the reading device. You must enable the appropriate settings on your smartphone to receive alarms and alerts, see the FreeStyle Libre 2 User’s Manual for more information.
||||The FreeStyle LibreLink app is only compatible with certain mobile devices and operating systems. Please check Abbott’s compatibility guide for more information about device compatibility before using the app. Use of the FreeStyle LibreLink app requires registration with LibreView.