Choosing Between Stelo, Lingo and Levels for Diabetes: Everything to Know About OTC CGMs
Wearable glucose trackers have moved from the pharmacy counter to the checkout aisle, and the OTC CGM comparison shoppers are now making at home looks a lot like the one diabetes patients used to navigate only with a prescription pad in hand. Stelo, Lingo and Levels each promise to turn real-time glucose data into something useful — whether that’s tighter diabetes management or a clearer picture of how breakfast, stress or a bad night of sleep nudges your metabolism. Choosing between them comes down to wear time, app design and what you actually want to learn.
What a Continuous Glucose Monitor Does
A continuous glucose monitor, or CGM, is a wearable device that tracks glucose around the clock instead of capturing a single reading from a fingerstick. The sensor sits just under the skin and measures glucose in interstitial fluid, sending data to a smartphone app that displays current levels and trends. Some CGMs also connect with insulin pumps.
CGM use has been associated mainly with people who have diabetes. People experiencing prediabetes, obesity, certain glycogen storage diseases and insulinoma may also use them based on recommendations from healthcare providers.
Stelo: An OTC Option for Adults Not on Insulin
The Stelo Glucose Biosensor System is described on the company’s website as “an over-the-counter (OTC) integrated Continuous Glucose Monitor (iCGM) intended to continuously measure, record, analyze and display glucose values in people 18 years and older not on insulin.” It’s marketed as a tool to help users detect normal (euglycemic) and low or high (dysglycemic) glucose levels, and to understand how lifestyle changes affect glucose excursions.
Stelo does not require a prescription. It has a wear time of up to 15 days, with a 12-hour grace period. People often use it to understand how specific foods, exercise, stress, sleep or fasting affect their glucose responses and overall metabolic health. For shoppers searching online for a Dexcom OTC CGM or other biosensor options, Stelo is one of the most visible names in the category.
Lingo: Real-time Updates Every Minute
Lingo positions itself as a CGM aimed squarely at metabolic health awareness. “The Lingo biosensor is a continuous glucose monitor (CGM) that measures your glucose response to food, exercise and stress, then streams the data to your phone 24/7,” per the website. The sensor uses “a tiny filament that sits just below the skin,” and where some sensors refresh every 15 minutes, Lingo “streams real-time updates every minute of every day.”
The app, the company says, “can help you see the connection between the foods you eat, your daily activity, and your glucose data — giving you insights you can use to create healthier habits over time. It’s also packed with science-backed tips and short reads on ways to improve your glucose patterns.” Lingo is discreet, water-resistant, lasts up to 14 days and does not require charging.
Levels: A Platform-First Approach to CGM OTC Tools
Levels takes a different angle in the CGM OTC market: rather than being a sensor brand, it’s a metabolic health company that pairs CGM data with broader analysis. “Levels helps you understand how diet and lifestyle affect your body, so you can make changes that improve energy, appetite and long-term metabolic health,” per the company’s website, which markets Levels as “The company that brought glucose monitoring into everyday metabolic health.”
Users can bring their own CGM or get one through Levels. The platform tracks glucose levels in real time through a wearable sensor and analyzes the data in its app, providing personalized insights into patterns like glucose spikes, variability and insulin sensitivity. Levels combines CGM data with lifestyle information and biomarker testing to help users make informed decisions about nutrition and daily habits, with the goal of improving energy, metabolic health and long-term wellness.
For a deeper side-by-side breakdown of devices, the AACE has mapped out a CGM device comparison.
How to Choose the Right OTC CGM Monitor
Picking an OTC CGM monitor isn’t just about brand recognition. Wear time, app experience, data granularity and whether you want a platform layered on top all factor in. Stelo offers up to 15 days of wear with a grace period. Lingo refreshes every minute and lasts up to 14 days. Levels can work with a CGM you already own or one it provides, and leans into broader metabolic coaching.
The ADA advises shoppers to “take the time to investigate both options and talk to your doctor and diabetes educator, who can provide valuable guidance and insights about the type of CGM system that may be right for you. They can also help you make the transition to a CGM and provide training to help you learn how to interpret and use your data to make appropriate treatment decisions and achieve your blood sugar goals.”
For most buyers, the smartest first step is a conversation with a clinician — followed by an honest look at what you want a sensor to tell you.
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