Continuous glucose monitors (CGMs) have transformed from prescription-only devices into accessible tools that let you track your blood sugar in real time, right from your smartphone. Until recently, the only way to check glucose was through daily finger pricks. Now, small sensors worn on your arm can monitor your levels every five minutes, 24 hours a day, sending data directly to your phone or smartwatch. The shift is significant: the first over-the-counter CGM received FDA approval in 2024, opening the door for people curious about their metabolic health without needing a doctor's prescription .

What Changed: From Prescription to Over-the-Counter Glucose Monitoring?

The landscape of glucose monitoring has shifted dramatically in recent years. Historically, CGMs were reserved for people with type 1 diabetes or those on insulin therapy. Today, two over-the-counter options are available: Stelo by Dexcom and Lingo, both FDA-approved for general use. Stelo, which launched in 2024, was the first over-the-counter CGM available in the United States. It's a small sensor that sits on the back of your arm and tracks glucose levels continuously. Each sensor lasts up to 15 days, and a two-pack costs $99, or $89 per month with a subscription .

The appeal is straightforward: you get real-time insights into how your meals, stress, exercise, and daily habits affect your blood sugar without needing a prescription or doctor's approval. For people with diabetes diagnoses, prescription CGMs like the Dexcom G7 and Abbott FreeStyle Libre 3 Plus remain the gold standard because they include safety alerts for dangerously high or low glucose levels. But for those simply curious about their metabolic health, the over-the-counter options offer an accessible entry point .

How Do Different CGM Devices Compare?

Not all continuous glucose monitors work the same way. The main differences come down to sensor lifespan, alert capabilities, app features, and whether they require a prescription. Understanding these distinctions helps you choose the right device for your situation.

• Stelo by Dexcom: The first over-the-counter CGM, it requires no prescription and pairs seamlessly with Oura rings. It tracks glucose 24/7 with a 15-day sensor lifespan, but does not send safety alerts for high or low blood sugar levels, making it better suited for general health tracking than active diabetes management.
• Lingo: Another over-the-counter option with a 14-day sensor lifespan, Lingo features a gamified app that turns glucose tracking into habit-building challenges. It's water-resistant and affordable for a two-week trial, though about 20% of sensors may not last the full 14 days, and it also lacks high/low safety alerts.
• Dexcom G7: A prescription device that measures glucose every five minutes and connects to your phone or Apple Watch. It allows you to share real-time data with up to 10 people and offers customizable alerts. For people on insulin pumps, it can integrate into a closed-loop system that automatically adjusts insulin delivery if blood sugar drops too low.
• Abbott FreeStyle Libre 3 Plus: An affordable, widely available prescription option with optional blood sugar alarms and a small sensor. The self-injector can sometimes cause misplacements, and certain models were recalled in 2026 due to incorrect glucose readings.
• Medtronic Guardian Connect System: A standout feature is its predictive alerts, which warn you before your blood sugar becomes dangerously high or low, rather than alerting you after the fact. It includes the Sugar.IQ diabetes assistant app to help identify which foods, exercise, and insulin doses work best for you.
• Eversense 365: If you want a device you don't have to replace for an entire year, this is the option. A healthcare provider inserts the sensor under your skin, and you wear a transmitter above it. The long lifespan is convenient, but it requires frequent calibrations and professional insertion.

The choice between these devices depends on your needs. People with type 1 or type 2 diabetes who take insulin benefit most from prescription CGMs with safety alerts. Those simply interested in understanding their metabolic patterns may find over-the-counter options sufficient and more affordable .

What Do Doctors Say About CGM Effectiveness for Diabetes Management?

Medical professionals increasingly view continuous glucose monitoring as a valuable tool for understanding how individual choices affect blood sugar. The data these devices provide goes beyond simple numbers; it reveals patterns that help patients and doctors make better treatment decisions.

"I find continuous glucose monitoring to be a valuable tool in the management of both type 1 and 2 diabetes. CGM data provides actionable insight to help patients track their glycemic response to dietary choices and activity levels," said Dr. Josh Emdur, medical director of SteadyMD.

Dr. Josh Emdur, Medical Director at SteadyMD

For pregnant people with diabetes, CGMs offer particular benefits. Dr. Rebecca Fenichel, an endocrinologist at Westmed Medical Group, noted that the Dexcom G7 is approved for use during pregnancy and provides continuous monitoring visible on your phone at all times. This real-time visibility helps expectant mothers and their doctors maintain tighter glucose control, which is critical for both maternal and fetal health .

"For patients on an insulin pump, the Dexcom G6 may connect with your pump and offer a closed-loop system to turn off your insulin if you are going low," explained Dr. Rebecca Fenichel, an endocrinologist at Westmed Medical Group.

Dr. Rebecca Fenichel, Endocrinologist at Westmed Medical Group

How to Choose the Right Continuous Glucose Monitor for Your Situation

• Assess your diabetes status: If you have type 1 diabetes, type 2 diabetes on insulin, or gestational diabetes, choose a prescription CGM with safety alerts like the Dexcom G7 or Guardian Connect. If you're managing prediabetes or simply curious about your glucose patterns, an over-the-counter option like Stelo or Lingo may be sufficient.
• Consider your lifestyle and preferences: If you want a device you wear for an entire year without replacement, Eversense 365 is ideal, though it requires professional insertion. If you prefer simplicity and low maintenance, Stelo or Lingo offer easy application and removal. If you want predictive alerts that warn you before problems occur, the Guardian Connect System stands out.
• Evaluate app features and connectivity: Some people prioritize sharing data with family members or healthcare providers; the Dexcom G7 allows sharing with up to 10 people. Others prefer gamified experiences that make tracking feel less like a chore; Lingo's app includes habit-building challenges. Consider whether you want integration with other devices like Oura rings or Apple Watches.
• Factor in cost and insurance coverage: Over-the-counter CGMs like Stelo cost $89 to $99 per month. Prescription devices may be covered by insurance, though coverage varies. Ask your doctor which options your insurance covers before making a decision.
• Consult your healthcare provider: Before choosing any CGM, discuss your specific needs with your doctor. They can recommend the device best suited to your diabetes type, medication regimen, and health goals. If you have a diabetes diagnosis and want to try an over-the-counter CGM, confirm with your doctor that it will provide the alerts and insights you need.

What Insights Can You Actually Gain From Wearing a CGM?

One of the most powerful aspects of continuous glucose monitoring is the ability to see exactly how your individual habits affect your blood sugar. During a two-week trial of the Stelo CGM, patterns emerged that wouldn't be visible from occasional finger-stick tests. Taking a walk after dinner, for example, visibly reduced post-meal glucose spikes. Stress levels, sleep quality, and even the order in which you eat foods all showed measurable effects on glucose readings .

This personalized feedback is particularly valuable because glucose response varies significantly from person to person. A meal that causes a sharp spike in one person might have minimal impact on another. CGMs reveal your individual metabolic signature, allowing you to make dietary and lifestyle choices based on real data rather than generic advice. For people managing diabetes, this information helps optimize medication timing and dosing. For those with prediabetes, it can motivate lifestyle changes by showing the direct impact of exercise and dietary choices on blood sugar control .

However, it's important to note that over-the-counter CGMs like Stelo are not designed for people who take insulin or have an active diabetes diagnosis. These devices lack the safety alerts needed for insulin-dependent users. If you have diabetes and want to try a CGM, speak with your doctor first to ensure the device will provide the alerts and features your condition requires .

The continuous glucose monitor revolution represents a significant shift in how we understand and manage metabolic health. Whether you're managing type 2 diabetes, monitoring prediabetes, or simply curious about how your body processes glucose, these devices offer unprecedented insight into your personal metabolic patterns. The key is choosing the right device for your situation and working with your healthcare provider to interpret the data effectively.