Three over-the-counter glucose sensors keep coming up when adults with type 2 diabetes who do not use insulin ask which one to buy: Dexcom’s Stelo, Abbott’s Lingo, and Abbott’s FreeStyle Libre Rio. This guide compares Stelo with the Libre Rio, the one cleared specifically for type 2 diabetes, and is honest about what we could and could not confirm. If you want Stelo against Lingo, read our Stelo vs Lingo guide.
Quick answer: Both Stelo and Libre Rio are cleared for adults 18 and older who do not use insulin. Stelo is on sale now, wears up to 15 days, and costs about $89 to $99 a month at the prices we found. Libre Rio was cleared in June 2024 specifically for adults with type 2 diabetes who manage it without insulin, but the latest sources we read say it had not launched in the United States and had no announced price. For most people shopping today, the practical choice is Stelo or Lingo, and Rio is one to watch. Neither sensor is a substitute for a prescription CGM if you use insulin. This is education, not medical advice.
Read this first: the FreeStyle Libre Rio was cleared by the FDA in June 2024, but the most recent sources I could read (published April and August 2026) say it had not launched commercially in the United States, with no confirmed retail date and no announced price. I could not open Abbott’s own product page from my tools, so check Abbott’s FreeStyle site before you plan around it. Be careful with any site that offers Rio “pre-orders,” because one 2026 buying guide warns against them. The comparison below therefore describes what is on paper, not a product you can necessarily buy today.
Who each sensor is cleared for
Clearance wording matters, because it sets who the maker says the device is for. The quotes below come from the sources linked at the end of this guide.
| Question | Stelo (Dexcom) | FreeStyle Libre Rio (Abbott) |
|---|---|---|
| Age | 18 and older | 18 and older |
| Insulin | Not for people on insulin therapy | “Indicated for non-insulin using persons ages 18 and older” (Abbott safety information); not compatible with insulin pumps (ADCES) |
| Diabetes status | Adults with or without diabetes who do not use insulin (diaTribe) | Adults with type 2 diabetes who manage it through lifestyle changes, per Abbott and ADCES |
| Low blood sugar | Not for people with problematic hypoglycemia | Use a meter if readings do not match symptoms (ADCES); we did not find a hypoglycemia exclusion in the pages we could open |
| Prescription | No, sold over the counter | No, described by Abbott as over the counter |
The main difference is the target audience. Stelo is positioned broadly for adults who do not use insulin, including people without diabetes. Libre Rio is positioned for adults with type 2 diabetes who are not on insulin. If you have a type 2 diagnosis and you are not on insulin, you fit both. If you do not have diabetes, only Stelo (and Lingo) is aimed at you.
Side-by-side specs
Some specs differ between sources, and some were not stated at all. Where sources disagreed, the table says so instead of picking one.
| Feature | Stelo | FreeStyle Libre Rio |
|---|---|---|
| Wear time | Up to 15 days, plus a 12-hour grace period | Reported as up to 15 days (ADCES); diaTribe says two weeks, the same as Libre 2 |
| Warm-up | 30 minutes (Stelo guide) | Not stated in the sources we could read |
| How you get readings | Phone app; the app shows a value every 15 minutes | ADCES says users scan to get readings and continuous transmission is not supported; other sources describe an app, so confirm with Abbott |
| Measuring range | Sensor 40 to 400 mg/dL; app graph 70 to 250 mg/dL | 40 to 400 mg/dL |
| Update detail | One review says the sensor measures every 5 minutes and sends to the app every 15; others say a reading every 15 | ADCES: measures every minute, records every 15 minutes, stores up to 8 hours |
| Low and high alarms | None | No customizable alerts (ADCES) |
| Calibration | Factory calibrated | Factory calibrated |
| Placement | Back of the upper arm | Back of the upper arm |
| Water | Up to 8 feet for 24 hours when properly applied (Stelo guide) | Can be worn during exercise, showering, and swimming (ADCES) |
| Extras | Apple Watch display, Oura integration, Dexcom Clarity sharing | Not stated in the sources we could read |
The most important cell is the one we could not settle: how Rio delivers readings. A scan-to-read sensor shows glucose only when you scan it, which changes how well you would catch overnight patterns. A sensor that sends data to your phone continuously fills in the whole night. Until Abbott’s own material is in front of you, treat that as an open question.
Price and cost over three months
Prices change, and the figures below are the example prices from our Stelo vs Lingo cost guide, not a live quote. Libre Rio has no announced price, so it cannot be compared yet. The three-month column scales each plan to 90 days of wear. (Sources disagree slightly: a Lingo sensor is $49 in most sources and $54 in one, and Stelo’s two-sensor pack is $99 against a subscription at $89 a month.)
| Plan | Price | Days covered | Per day / 90-day cost |
|---|---|---|---|
| Stelo, one-time two-sensor pack | $99 | 30 | $3.30 / $297 |
| Stelo, monthly subscription | $89 | 30 | $2.97 / $267 |
| Stelo, three-month plan | $252 | 90 | $2.80 / $252 |
| Lingo, six sensors (12 weeks) | $249 | 84 | $2.96 / $267 |
| Lingo, two sensors (4 weeks) | $89 | 28 | $3.18 / $286 |
| Lingo, one sensor | $49 | 14 | $3.50 / $315 |
| FreeStyle Libre Rio | No price announced | – | – |
Worked check: Stelo’s three-month plan is $252 for 90 days, which is $252 ÷ 90 = $2.80 a day. Buying two-sensor packs at $99 for 30 days is $3.30 a day, which comes to about $297 over 90 days. The difference is $297 − $252 = $45 for the same stretch of wear. Subscribing monthly at $89 lands in the middle at $267 over three months. Add ongoing costs people forget: adhesive patches if your sensor lifts, and the price of confirming surprising readings with a meter.
Who should choose which
- Choose Stelo now if you have type 2 diabetes or prediabetes, do not use insulin, want a sensor you can actually buy, and like the idea of 15-day wear, Apple Watch display, and sharing data with a clinic through Dexcom Clarity.
- Watch Libre Rio if you want a sensor made specifically for type 2 diabetes without insulin, you already use other Abbott products, or you want to compare prices once it launches. Do not wait for it if you want data this month.
- Choose neither if you use insulin, have had serious low blood sugar, or need urgent high and low alarms. Ask about a prescription CGM, and read prescription vs over-the-counter CGM after a diagnosis.
If your goal is to learn how your meals, walks, and sleep move your glucose, our which CGM is right for your goal guide helps you decide whether a CGM is even the right tool, and how to read your CGM data covers what to do once you have a sensor.
Which sensor fits your situation
The right answer depends less on specs than on who you are and what you want to learn. These scenarios describe the questions each person is likely asking. They are general education, not a prescription, and none of them replaces a conversation with the clinician who knows your history.
If you have prediabetes or a borderline A1C
Stelo is the cleaner fit because it is described as suitable for adults who do not use insulin, with or without diabetes. Libre Rio is described as being for adults with type 2 diabetes, so it is aimed at a different group. A sensor can help you see how meals and walks move your numbers while you work on habits. It cannot tell you whether you have prediabetes, which is decided by lab tests such as A1C and fasting glucose. If you want the reference ranges, read our normal blood sugar chart.
If you have type 2 diabetes and do not use insulin
You are inside the label for both. Today the practical difference is availability: Stelo can be bought, and Libre Rio had no confirmed US launch in the latest sources we read. Before choosing either, ask your prescriber one question that is easy to skip: can any of my medicines cause low blood sugar? Some diabetes medicines can, and an over-the-counter sensor without urgent alarms may not be the right safety net if yours do. That question belongs in the room with your clinician, not in a product comparison.
If you are newly diagnosed and overwhelmed
Start with the basics before you buy hardware: a food plan you can follow, a walking habit, and a follow-up appointment. A sensor is useful when it answers a specific question, such as how a certain breakfast affects you. Our first steps after a type 2 diagnosis guide covers the order of operations. A sensor on day one can be motivating or it can be one more thing to worry about, and only you can judge which.
If you are curious about food and fitness but do not have diabetes
Stelo is positioned for you and Libre Rio is not. Keep expectations modest. Glucose moves for many ordinary reasons, including sleep, stress, a hard workout, and the timing of a meal, and a spike on a graph is not a diagnosis. Sensor readings also run behind blood readings by several minutes, which matters most during exercise. Use the data to notice patterns across days, not to judge a single meal.
If you use insulin or have had serious low blood sugar
Neither of these is the right tool. Both are labeled for people who do not use insulin, and neither offers the urgent alarms that prescription systems provide. Ask your clinician about a prescription CGM. Our guide to prescription vs over-the-counter CGM explains how the two categories differ.
A three-month plan for using a sensor well
People often wear a sensor for two weeks, stare at the graph, and put it in a drawer. A plan makes the money work harder. This one is built around Stelo because it is the one you can buy today, but the same structure would apply to Libre Rio if it launches. Stelo’s two-sensor pack covers about 30 days, so each month below is two sensors.
| Month | Focus | What to write down |
|---|---|---|
| Month 1 | Learn your baseline. Eat normally and change nothing on purpose. | Meals, walk times, sleep hours, and any reading that surprised you |
| Month 2 | Change one thing at a time, such as a 10-minute walk after dinner. | Which change you made, on which days, and what the graph did afterward |
| Month 3 | Repeat the changes that helped, then prepare for your appointment. | A short list of patterns and two or three questions for your clinician |
In month one, resist the urge to fix things. You are collecting a baseline, and a baseline is only useful if it reflects your real week. In month two, change one variable at a time. If you add a walk, swap your breakfast, and sleep an hour more all in the same week, you will not know which change did what. In month three, look for repeatable patterns rather than single events. A pattern is something that happened on at least three or four days. Then bring a screenshot and your notes to your appointment. Our guide to reading CGM data shows what to look at first.
Worked examples with the numbers
Every number below is computed from the example prices in the cost table above. Prices change, so treat these as arithmetic you can redo with current prices rather than as quotes.
- Six months on Stelo. Monthly subscription: 6 × $89 = $534. Two three-month plans: 2 × $252 = $504. The plans cost $30 less over the same six months.
- A full year on Stelo. Monthly subscription: 12 × $89 = $1,068. Four three-month plans: 4 × $252 = $1,008. One-time packs: 12 × $99 = $1,188. The gap between the cheapest and priciest year is $180.
- Wearing only one season. If you wear a sensor for one quarter and stop, the three-month plan costs $252, while a year-round plan costs $1,008. You avoid $756 by treating the sensor as a short experiment rather than a permanent habit.
- Readings per sensor. If the app shows a value every 15 minutes, that is 4 × 24 = 96 values a day. Over 15 days that is 96 × 15 = 1,440 values per sensor, and 2,880 per two-sensor pack. At $99 a pack, that is roughly $0.034 per value. This is a way to see what you are paying for, not a claim that every value is equally accurate.
- An illustrative day. These numbers are made up to show the arithmetic. If 72 of a day’s 96 values fall inside a range you and your clinician choose, that is 72 ÷ 96 = 75.0% of the day in range. Fewer values outside the range means more time inside it, but the right range for you is a clinical decision.
A decision flowchart in table form
Read from the top. Stop at the first row that applies to you.
| Step | Question | If yes | If no |
|---|---|---|---|
| 1 | Do you use insulin, or have you had serious low blood sugar? | Skip both. Ask about a prescription CGM. | Go to step 2 |
| 2 | Are you under 18? | Neither is cleared. Talk with a pediatric clinician. | Go to step 3 |
| 3 | Do you want readings this month? | Stelo is the one you can buy. Go to step 5. | Go to step 4 |
| 4 | Do you have type 2 diabetes and want a sensor aimed at it? | Watch for a Libre Rio launch and price. | Stelo or Lingo both fit; compare cost |
| 5 | Does your medicine list include anything that can cause lows? | Ask your prescriber before buying. | Go to step 6 |
| 6 | Can you commit to at least one full sensor? | Start with the smallest pack, then decide. | Wait until you can |
What these sensors can and cannot tell you
A sensor measures glucose in the fluid under your skin, not in your blood. That is why readings can trail blood readings by several minutes and can differ from a finger-stick. For learning how your body responds to food, movement, and sleep, that difference is usually acceptable. For safety decisions, it is why clinicians still rely on meters in some situations.
What a sensor can help you see:
- How different meals affect your glucose over the next few hours.
- Whether a short walk after eating changes the shape of your curve.
- Overnight and early-morning patterns, if the sensor records through the night.
- Whether a change you made, such as a new breakfast, is repeatable across several days.
What a sensor cannot do:
- Diagnose diabetes or prediabetes. Diagnosis uses lab tests.
- Tell you how much medicine to take. Do not adjust a dose from an over-the-counter graph.
- Replace urgent low and high alarms. Neither device has them.
- Replace a meter when your symptoms do not match the number.
- Guarantee accuracy in the first hours after insertion, when many sensors are less stable, or when you press on the sensor while sleeping.
Pros and cons of each device
| Device | Pros | Cons |
|---|---|---|
| Stelo | On sale now; up to 15 days per sensor; Apple Watch display and clinic sharing through Dexcom Clarity; suitable for adults who do not use insulin, with or without diabetes | No alarms; app range shown as 70 to 250 mg/dL; not for people on insulin; ongoing cost |
| FreeStyle Libre Rio | Cleared for adults with type 2 diabetes who do not use insulin; reported 15-day wear; backed by Abbott’s sensor experience | No confirmed US launch or price in the latest sources; how readings are delivered is unclear; no customizable alerts |
Questions to ask the manufacturer
When Abbott publishes a launch page, or when you buy from Dexcom, ask these directly and write down the answers:
- How do I get my readings: continuously in an app, or only when I scan?
- What is the exact wear time and grace period for one sensor?
- What is the total price for a 90-day supply, including shipping and taxes?
- Can I cancel a subscription, and is there a fee?
- Is the sensor eligible for HSA or FSA spending?
- What is the return policy if the sensor fails or falls off early?
- How is my glucose data stored and shared, and can I delete it?
What else moves your glucose besides food
It is tempting to blame every spike on the last thing you ate. In practice, several other factors shift glucose, and a sensor makes them visible. Poor sleep can leave morning readings higher than usual. Stress and illness can push numbers up even when your meals are unchanged. A hard workout can raise glucose briefly before it falls, which surprises many people. Some medicines, including steroids, raise glucose, and others can lower it. Even the order you eat things in and the time of day can change the shape of the curve. Our guide to the dawn phenomenon explains one common morning pattern, and the walking after meals guide covers a habit many people test first. The point is not to memorize every cause. It is to keep a short note beside each interesting reading, so that when you look back you can tell a food effect from a sleep effect or a stress effect.
How to prepare for your appointment
A sensor is most valuable when it makes a short appointment more productive. Before you go, export or screenshot a typical week and a week that surprised you. Write down three observations in plain words, such as my morning readings were higher on days I slept under six hours. Add the two questions that matter most to you. Bring your medicine list, because your clinician will interpret the graph in light of what you take. Ask what range they want you to aim for, since that is their call and not the sensor maker’s. Finally, ask whether a longer or different kind of monitoring would help. The goal is not to impress your clinician with data. It is to give them a clear picture that a single office reading cannot show.
Bottom line by situation
| Situation | Best fit today | Note |
|---|---|---|
| Want a sensor this month, no insulin | Stelo | Available now; confirm current price |
| Type 2 diabetes, no insulin, can wait | Watch Libre Rio | No confirmed launch or price in the latest sources |
| No diabetes, curious about food | Stelo or Lingo | Libre Rio is aimed at type 2 diabetes |
| Uses insulin or has serious lows | Neither | Ask about a prescription CGM |
| Tight budget | Short Stelo trial | One pack, then decide |
If you remember one thing, make it this: an over-the-counter sensor is a learning tool, not a safety device. Pick the one you can actually buy, use it with a plan, and take what you learn to a clinician.
Common mistakes
- Buying from a Rio “pre-order” page. A 2026 buying guide warns against third-party pre-order listings for a product that had not launched.
- Treating an over-the-counter sensor like an insulin-dosing tool. Neither sensor is meant to be used to dose insulin or to replace urgent low-glucose alarms.
- Judging by one reading. Sensors can read falsely low when you lie on them. Look at trends across several days.
- Comparing sticker prices instead of price per day. A pack’s price means little until you divide by the days it covers.
- Changing a medicine because of a graph. Bring the data to your prescriber instead.
Questions to bring to your appointment
- Would a CGM help me, given my medicines and my A1C?
- Am I a good fit for an over-the-counter sensor, or should I ask for a prescription CGM?
- How would you want me to share the data, and for how many weeks?
- What readings should make me call you or check with a meter?
- Does my plan, HSA, or FSA cover any of this?
Frequently asked questions
Is the FreeStyle Libre Rio available in the United States?
The FDA cleared it in June 2024, but the most recent sources we could read (April and August 2026) said it had not launched commercially and had no announced price. We could not open Abbott’s own product page, so check Abbott’s FreeStyle site for current status.
Who is Stelo cleared for?
Stelo is cleared for adults 18 and older who do not use insulin, and it is not for people with problematic hypoglycemia. It is sold over the counter.
Who is the Libre Rio cleared for?
Abbott describes it as indicated for non-insulin using persons ages 18 and older, and it is aimed at adults with type 2 diabetes who manage it through lifestyle changes.
Does Stelo have low and high glucose alarms?
No. Over-the-counter sensors like Stelo do not provide the urgent low and high alarms that prescription CGMs offer, so they are not designed for people who use insulin.
How much does Stelo cost per month?
At the prices we found, about $99 for a one-time two-sensor pack covering roughly 30 days, or $89 a month on subscription. Prices change, so confirm on the manufacturer’s site.
How long does a Stelo or Libre Rio sensor last?
Stelo is up to 15 days, plus a 12-hour grace period. One reference lists Libre Rio as up to 15 days while another says two weeks, so confirm with Abbott when it launches.
Should I wait for the Libre Rio?
If you want data now, do not wait. Stelo and Lingo are available. If you value a sensor aimed at type 2 diabetes and can wait for a launch date and price, it is worth watching.
Can I use Stelo if I only have prediabetes?
Stelo is described as suitable for adults 18 and older who do not use insulin, including people without diabetes. A sensor cannot diagnose prediabetes, so use lab tests for that and talk with a clinician about whether a sensor adds anything.
Does insurance cover Stelo or the Libre Rio?
Over-the-counter sensors are generally paid for out of pocket, and we did not find confirmed insurance coverage for either. Some people use HSA or FSA funds, but eligibility varies, so confirm with your plan administrator before you buy.
Can I exercise or swim with a Stelo sensor?
Stelo is described as water resistant, with one guide listing up to 8 feet for 24 hours when properly applied. Sweat and swimming can loosen adhesive, so follow the instructions that come with the sensor and use overpatches if needed.
Sources used: Abbott newsroom (June 25, 2024), ADCES DANA product page for FreeStyle Libre Rio, diaTribe on the Abbott clearances, diaTribe on Stelo, Best Buy Medical Supplies comparison (April 21, 2026), My Medicine Advisor (August 28, 2026), and Tech Byte Haven (April 28, 2026). Stelo and Lingo details also match our own Stelo vs Lingo guide. Several of these are retailer or review sites, not regulators.
About the author: Charles Kirkland is the founder of Metabolic Clarity Labs and author of The Journey Back. He is not a physician. This is general education, not a medically reviewed treatment plan.
Sources checked October 31, 2026. Discuss personal decisions with a qualified clinician. Do not start, stop, or change prescribed treatment based on this article.
Wearables and CGMs: smartwatch and smart ring glucose vs CGM.
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