Best Continuous Glucose Monitors: Picks and What to Look For

For most people with diabetes who use insulin, the Dexcom G7 and Abbott’s FreeStyle Libre 3 Plus are the two systems most often named by reviewers, while the over-the-counter Dexcom Stelo and Abbott Lingo suit people who are not on insulin and simply want to see how food, sleep and exercise move their glucose. Medtronic’s Simplera suits people who use a Medtronic pump, and Eversense 365 suits anyone who wants a sensor that stays in place for a year. This guide compares what each maker states, how the systems differ in wear time, alerts and app support, and what to ask your care team before buying. It is general information, not medical advice. Which device is right, and what the numbers mean for your treatment, is a decision for your doctor, diabetes nurse or pharmacist.

Our top picks

Top pickLingo Continuous Glucose Monitor

Check price on Amazon

Also greatLingo Continuous Glucose Monitor

Check price on Amazon

Also greatLingo Continuous Glucose Monitor

Check price on Amazon

Also greatMetene TD-4116 Blood Glucose Monitor Kits

Check price on Amazon

As an Amazon Associate we earn from qualifying purchases at no extra cost to you.

At a Glance: Current Continuous Glucose Monitors

Prescription Systems for Diabetes Management

Dexcom G7

The G7 folds the sensor and transmitter into one small, disposable unit worn on the back of the upper arm (and, for some age groups, the upper buttocks, according to Dexcom). Dexcom states that the original G7 runs for 10 days with a 12-hour grace period after the sensor tells you it is ending, and it has also introduced a 15 Day version that lasts longer per sensor. The system sends readings every five minutes to a compatible phone, smartwatch or a dedicated receiver, and lets you set urgent-low, low and high alerts. Reviewers often highlight its integration with several insulin pumps and automated insulin delivery systems, which is a major reason people choose it if they use or plan to use a pump. The trade-off is that the sensor is single-use, so if you are on a tight budget you should look at how your insurer or health service covers sensors and refills.

FreeStyle Libre 3 Plus and Libre 2 Plus

Abbott’s Libre sensors are among the slimmest on the market, roughly the size of a couple of stacked coins according to the maker’s imagery. The Libre 3 Plus is listed by Abbott for up to 15 days of wear and sends glucose readings to the app each minute, with optional alarms for low, high and signal loss. The Libre 2 Plus also lists up to 15 days and supports alarms, and it can be read by a reader or a phone depending on the region. Reviewers tend to like the long wear period and the simple setup. Check that your phone model is on the compatibility list before you commit, because support differs by country and operating system version.

Medtronic Simplera

Simplera is Medtronic’s newer disposable sensor, designed to pair with its current insulin pump systems and to be inserted with a one-step applicator, as the maker describes it. If you already use a Medtronic pump, this is the sensor your clinic will most likely discuss. If you do not use one of those pumps, a Dexcom or Abbott sensor generally gives you more choice of apps and devices.

Eversense 365

Eversense takes a different approach. A clinician places a small sensor under the skin of the upper arm, and you wear a removable transmitter on top that powers the sensor, vibrates for alerts and sends readings to a phone. The maker states that the 365 version lasts about a year before the sensor is replaced. People who dislike changing adhesive patches every couple of weeks often find this appealing, but you must be comfortable with a minor procedure in a clinic and with the transmitter being on your arm every day. You can take the transmitter off, for example to charge it, and the maker says the sensor continues to store readings meanwhile, though you will miss alerts while it is off.

Over-the-Counter Options for Non-Insulin Users

Dexcom Stelo and Abbott Lingo are positioned as wellness products rather than diabetes management systems. They are sold without a prescription in the regions where they are cleared, and they present glucose trends in an app to help you notice how different meals, workouts or sleep patterns line up with your readings. Both makers describe them for adults who do not use insulin. They are not meant to replace the system your care team prescribes if you have diabetes, and neither should be used to change medication on your own. If you see repeated very high or very low readings, or you feel unwell, speak to a doctor rather than relying on an app.

What to Look For

• Wear time: Ranges from about 10 days up to 15 days for patch-style sensors, and about a year for the implanted Eversense. Longer wear means fewer changes but may mean a higher up-front cost per sensor.
• Alerts: Insulin users generally want urgent-low and predictive alerts. Wellness systems usually offer fewer alarms.
• Phone and watch compatibility: Always confirm your exact phone model, operating system and region in the maker’s compatibility list.
• Pump and app integration: If you use an insulin pump or plan to, ask the clinic which sensors your pump supports.
• Adhesive and skin: Some people react to adhesive. Overpatches and barrier wipes are widely discussed by users, but talk to your clinic or pharmacist if you develop redness or irritation.
• Calibration and confirmation: Many current systems do not need routine finger-stick calibration, but the maker’s manual explains when a fingerstick should still be used, for example when symptoms do not match the reading.
• Medication interference: Some sensors list substances that can affect readings. Read the maker’s safety information and ask your pharmacist.

Fit, Wear and Care Notes

Follow the insertion instructions for the exact site, because the approved sites differ by product and age group. Clean the area as the leaflet instructs, let it dry fully, and avoid scarred or irritated skin. Swimming and showering are listed as acceptable by the makers within stated depth and time limits, but each manual has different limits, so read them. Remove sensors only as instructed, and dispose of used sensors in line with local rules. Do not use a sensor that has a damaged package or has passed its expiry date. Keep a backup meter and strips on hand if your doctor advises it, because sensors can fail, lose signal or give readings that do not match how you feel.

Budget Tiers

• Budget: Over-the-counter wellness sensors like Stelo or Lingo give a taste of continuous monitoring without involving a prescription, but they are not diabetes treatment tools.
• Mid-range: The FreeStyle Libre family is often discussed as the more economical prescription route, depending on how your insurer or health service covers it.
• Premium: Dexcom G7 with pump integration, Medtronic systems and the implanted Eversense are usually the higher-cost options, though coverage can change the real cost considerably.

Pick X If You Are…

Alternatives Worth Knowing

• Traditional blood glucose meter: Still the reference for confirmation tests and a low-cost fallback when a sensor fails.
• Flash systems and readers: Some people prefer a dedicated reader to avoid phone dependence.
• Clinic-supplied professional CGM: A clinic may lend a short-term sensor for a week or two to review patterns without buying a system.

Frequently Asked Questions

Do I need a prescription for a continuous glucose monitor?

For most diabetes systems such as Dexcom G7, FreeStyle Libre, Medtronic Simplera and Eversense, you need a prescription in many countries. Dexcom Stelo and Abbott Lingo are sold without one in the regions where they are cleared. Rules differ by country, so ask a pharmacist or your care team.

Can a CGM replace finger-stick tests completely?

Many current systems are labeled for treatment decisions without routine finger-sticks, but the manuals still describe situations where a meter reading should be used, such as when symptoms do not match the sensor. Follow the instructions for your device and your doctor’s advice.

Are over-the-counter sensors safe for people with diabetes?

The makers describe Stelo and Lingo for adults who are not using insulin, and they are not substitutes for prescribed diabetes systems. If you have diabetes, talk to your care team before choosing one.

How long does one sensor last?

The makers list roughly 10 to 15 days for the patch-style sensors, depending on the model, and about a year for the implanted Eversense 365. The sensor tells you when it is nearing the end of its life.

Can I swim or shower while wearing one?

The makers state that their sensors are water-resistant to specific depths and time limits, which differ by model. Read the manual for your system, and replace a sensor that has loosened.

What if the adhesive irritates my skin?

Skin irritation is a commonly reported issue. Stop wearing the sensor and speak to your clinic or pharmacist if you see redness, blistering or a rash, and ask which barrier or overpatch options suit your system.