Which CGM Is Right for You? A 2026 Comparison Guide
There are now four continuous glucose monitors (CGMs) available in the US in 2026 — two that require a prescription and two you can order over the counter without one. Which one belongs on your arm depends on four questions you need to answer before you look at price or features.
The CGM market expanded significantly last year, which means more choices — but also more marketing noise. This guide cuts through it. By the end, you will know exactly which device fits your situation.
Key Takeaways
There are four CGMs available in the US in 2026: the Dexcom G7, Freestyle Libre 3+, Dexcom Stelo, and Abbott Lingo.
If you need alarms for high or low blood sugar, you need a prescription CGM — the Dexcom G7 or Freestyle Libre 3+.
The Freestyle Libre 3+ is the least expensive option for cash-paying users at approximately $75 per month with the manufacturer's coupon.
Over-the-counter CGMs (Dexcom Stelo and Abbott Lingo) require no prescription and can be ordered online or on Amazon.
If you plan to work with a provider who will review your data, both the Dexcom G7 and Libre 3+ data can easily be shared. Of the OTC models, choose the Dexcom Stelo — it is currently the only OTC model that supports direct provider data sharing. The Lingo makes it harder to share data.
All four CGMs use similar technology, and knowing how to interpret your data matters as much as which sensor you choose.
What Questions Should I Ask Before Choosing a CGM?
Not every CGM is the right fit for every person. Answer these four questions first — they will point you to the right category before you even look at price or app features.
1. Do you need alarms for high or low blood sugar?
If you are on insulin or other anti-diabetic medications that can take your blood sugar dangerously low, you need a CGM with alarm functionality. Only prescription models include alarms. If alarms are a non-negotiable for your safety, your decision is already made. G7 or Libre 3+.
2. Will your doctor write you a prescription?
If the answer is no — or if you do not have a provider willing to prescribe a CGM — then an over-the-counter model is your path. No prescription, no problem. Stelo or Lingo.
3. Will your insurance cover it?
If your insurance covers a CGM, use a prescription model and let your insurance absorb the cost. Some insurance providers prefer one brand over another, so check with your plan before deciding.
4. Do you have a compatible smartphone?
All over-the-counter CGMs require a compatible smartphone. If you do not have one or prefer not to have your glucose data on the cloud, a prescription model is the better fit (G7 or Lingo 3+) — those come with separate readers.
What Are the Prescription CGM Options in 2026?
The two prescription continuous glucose monitors available in the US are the Dexcom G7 and the Freestyle Libre 3+ (Abbott also makes the Libre 2+, but the 3+ is the newer, smaller model and the one I focus on). Prescription means you need a doctor's order — but you do not need insurance. You can pay cash at the pharmacy.
How are the Dexcom G7 and Freestyle Libre 3+ different?
Cost: The Freestyle Libre 3+ is the least expensive of all four CGMs for cash-paying users. With the manufacturer's coupon, it comes to approximately $75 per month for two 15-day sensors. The Dexcom G7 is more expensive at cash price.
Calibration: The Dexcom G7 can be calibrated with a finger stick if you want to verify a reading. The Freestyle Libre is factory calibrated — you cannot and do not need to calibrate it manually.
Sensor size: The Libre 3+ is about the size of two stacked pennies. The Libre 2+ is closer to two stacked quarters — noticeably larger. I personally prefer the low profile of the 3+, and it is the one I recommend to my clients for that reason.
Transmission: The Libre 3+ automatically transmits data to your phone. You do not need to scan it.
Data sharing: Both prescription models make it straightforward to share your CGM data with a provider.
Alarms: Both include alarms for high and low blood sugar — the feature that sets them apart from OTC options.
Bottom line: Prescription CGMs are best for people who need alarms, anyone whose insurance will cover the cost, and cash-paying users who want the lowest monthly price for long-term use.
What Are the Over-the-Counter CGM Options in 2026?
Over-the-counter CGMs require no prescription. You order them online — through the brand website or Amazon — pay with a credit card or your FSA/HSA card, and they ship within a few days. The two OTC CGMs currently available in the US are the Dexcom Stelo and the Abbott Lingo. Both require a compatible smartphone and work on Apple and Android.
How are the Dexcom Stelo and Abbott Lingo different?
Cost: The Stelo is $99 for two 15-day sensors ($99 per month). The Lingo is $89 for two 15-day sensors, or $49 for a single sensor.
Stelo app: Straightforward and easy to use. It does not have a lot of extra features to learn, which is a real advantage if you are just getting started.
Lingo app: Has more features, including the Lingo Count — a scoring system that evaluates each of your meals. Some people find this helpful; others find it confusing. There is simply more to learn with the Lingo app.
Data sharing: The Stelo allows you to share your CGM data directly with a provider. The Lingo currently does not.
This is the most important practical difference between the two OTC options. The Lingo lets you download a data file, but it does not include your notes. I will work with patients who are using the Lingo, as I’ve developed some workarounds to view their data. But it’s a little clunky. I have been told data sharing may be coming to the Lingo, but it is not available yet.
Bottom line: If you plan to work with a provider who will review your CGM data, choose the Stelo. It is currently the only OTC model with direct provider data sharing.
| Dexcom G7 | Libre 3+ | Dexcom Stelo | Abbott Lingo | |
|---|---|---|---|---|
| Best for | Insulin users & anyone who needs alarms | Prescription users wanting a smaller sensor | Getting started without a prescription | Self-guided tracking with more app features |
| Prescription required? | ✔ Yes | ✔ Yes | ✗ No | ✗ No |
| Alarms (high & low) | ✔ Yes | ✔ Yes | ✗ No | ✗ No |
| Provider data sharing | ✔ Yes | ✔ Yes | ✔ Yes | ✗ Not available |
| Approx. monthly cost | Check manufacturer | ~$70–75/mo with couponCheck libre.us for current coupon | ~$99/mo2 × 15-day sensors | ~$89/mo2 × 15-day sensors; $49 for 1 |
Prices are approximate and subject to change. Visit each manufacturer's website for current pricing and coupon availability.
Which CGM Is the Most Accurate?
This is one of the most common questions I get, and my honest answer is: they all use similar technology, and at some point, every brand will give you a sensor that runs high or low.
I run a free Facebook community called CGM for Everyone where this question comes up constantly, and I follow other user communities and chat boards as well — after years of watching these conversations and supporting people using every one of these devices, what I can tell you is that no brand is immune.
It happens with all of them. Sometimes it is a technical issue with the sensor. Sometimes it is user error. No matter which CGM you choose, you will eventually get a dud.
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What actually makes the difference is knowing how to interpret your data — understanding what is a real reading versus a sensor artifact, and knowing what to do with the numbers you see.
These devices do not come with a detailed user manual. They tell you how to install the sensor. They do not teach you how to read the graphs, understand accuracy issues, or turn your data into a plan that actually improves your blood sugar.
This is exactly why I wrote Hack Your Blood Sugar Using a Continuous Glucose Monitor— it is the user manual that should come with these devices. It walks you through not just how to put the sensor on, but how to interpret your data, understand accuracy issues, and use what you see to create strategies that actually improve your blood sugar. 👉 Learn more about my book, Hack Your Blood Sugar Using a Continuous Glucose Monitor
Frequently Asked Questions
Do I need a prescription to get a CGM?
Not necessarily. Two CGMs are available over the counter in the US — the Dexcom Stelo and the Abbott Lingo — and require no prescription. Two others — the Dexcom G7 and the Freestyle Libre 3+ — require a prescription from your doctor, though you can pay cash at the pharmacy without using insurance.
Can I use a CGM if I don't have diabetes?
Yes. You do not need a diabetes diagnosis to use a continuous glucose monitor. CGMs are used to prevent and reverse chronic disease, assess metabolic health, and understand how food, exercise, sleep, and stress affect your blood sugar — whether you have type 2 diabetes, prediabetes, or are simply a healthy person who wants to stay that way.
What is the cheapest CGM available in 2026?
For cash-paying users, the Freestyle Libre 3+ is the least expensive option at approximately $70–$75 per month using the manufacturer's coupon. Among OTC models, the Abbott Lingo is $89 per month, or $49 for a single 15-day sensor.
What is the difference between a prescription CGM and an OTC CGM?
Prescription CGMs — the Dexcom G7 and Freestyle Libre 3+ — require a doctor's order but include alarm functionality for high and low blood sugar, come with separate readers, and can be covered by insurance. Over-the-counter CGMs — the Dexcom Stelo and Abbott Lingo — require no prescription, are ordered online, and are a good fit for people who want to start monitoring without involving their doctor. OTC models do not include alarms.
Which CGM works best with a provider or nutritionist?
If you are working with a provider who will review your CGM data, choose the Dexcom Stelo. It is currently the only over-the-counter CGM that supports direct provider data sharing. Both prescription models — the Dexcom G7 and the Freestyle Libre 3+ — also make it easy to share data with a provider.
How accurate are over-the-counter CGMs compared to prescription ones?
All four CGMs use similar underlying technology. Every brand will occasionally produce a sensor that runs high or low — this is true of prescription and OTC models alike. Accuracy can be affected by factors including user technique and sensor placement. Knowing how to interpret your data is as important as which device you choose.
Ready to Put Your CGM Data to Work?
You have picked your sensor. Now what?
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About the Author
Karen Kennedy, MS, CN, IFNCP, is a functional nutritionist specializing in blood sugar management and continuous glucose monitor implementation. She helps people with type 2 diabetes and prediabetes use CGM data to create personalized strategies that improve their metabolic health. Karen is the author of Hack Your Blood Sugar Using a Continuous Glucose Monitor and the host of the Hack Your Blood Sugar Podcast.