“Stelo or Lingo?” is the question most people type, but it comes second. The first question is what you want to learn. Once that is clear, the right device, or no device, usually becomes obvious. This guide matches common goals to the options and tells you when the honest answer is “skip it.”
Quick answer: If you have type 2 diabetes and do not use insulin, Stelo is the over-the-counter device whose clearance includes you. If you do not have diabetes and are curious about food responses, either can work, and Lingo is marketed to that group. If you use insulin or are prone to low blood sugar, you need a prescription CGM, not an over-the-counter one. If you only have a vague curiosity, labs and a food log may do the job. A CGM shows patterns; it does not diagnose anything.
What the two devices are built for
| Question | Dexcom Stelo | Abbott Lingo |
|---|---|---|
| Cleared for | Adults 18+ who do not use insulin and do not have problematic hypoglycemia, with or without diabetes (diaTribe overview of Stelo) | Adults 18+ who do not use insulin; not intended to diagnose diseases including diabetes (Abbott announcement of Lingo and Libre Rio) |
| Sensor wear | Up to 15 days | Up to 14 days |
| Measuring range | 40 to 400 mg/dL, per GoodRx | 55 to 200 mg/dL, per GoodRx |
| High/low alarms | None reported | None reported |
| Prescription | No | No |
| App emphasis | Glucose graph and trends | Graph plus coaching-style guidance |
Details above come from the GoodRx guide to over-the-counter CGMs, the diaTribe and Abbott pages linked in the table, and our own Stelo vs Lingo comparison. Specifications and prices change, so verify them with each company.
Decision guide by goal
| Your goal | Reasonable starting point | Things to watch |
|---|---|---|
| Curiosity about how foods affect me (no diabetes) | Lingo or Stelo for one or two sensor cycles | Normal glucose moves; see normal CGM ranges before reacting to a single spike |
| Prediabetes | Talk to your clinician first; an over-the-counter sensor is an option, as are labs and a meter | A sensor does not replace an A1C; read do you need a CGM with prediabetes |
| Type 2 diabetes, not on insulin | Stelo, or a prescription CGM if your clinician recommends one | Bring the data to your care team; do not change medicine on your own |
| Uses insulin, or has had severe lows | Prescription CGM | Over-the-counter sensors have no high/low alarms and are not intended for insulin users |
| Tired after meals | A short sensor trial plus a clinician visit | The graph shows a pattern, not a cause |
| Tight budget | Meter plus labs; see Lingo alternatives | Compare per-day cost; see Stelo vs Lingo cost |
| History of disordered eating | Talk with a professional before using any sensor | Abbott advises consulting a healthcare professional first |
Lingo vs Stelo for investigating post-meal fatigue
Feeling sleepy or foggy after eating is common, and people often wonder whether a glucose swing is the cause. A sensor can help you look: you can log when you feel tired and then check whether your glucose was climbing, peaking, or dropping at that time. That is useful information to show your clinician.
It has limits. Fatigue after meals can come from sleep debt, meal size, caffeine and alcohol, medicines, thyroid or iron problems, sleep apnea, and many other things. A sensor cannot separate those. If your fatigue is frequent, severe, or comes with other symptoms such as unusual thirst, frequent urination, blurred vision, or fainting, see a clinician instead of waiting for a graph. For either device, take notes: the time you ate, what you ate, and when you felt tired.
A worked example: matching three people to options
| Person | Situation | Reasonable path |
|---|---|---|
| Dana, 38 | No diabetes, normal labs, curious about her usual lunch | One two-week sensor trial, then stop; compare readings with the normal-range guide |
| Marcus, 56 | Type 2 diabetes, metformin only, A1C a bit above goal | Ask his clinician whether a prescription CGM or Stelo makes sense; share the data at the next visit |
| Priya, 61 | Type 2 diabetes on insulin, occasional lows | Prescription CGM with real-time alerts, arranged through her prescriber |
These are illustrative people, not medical advice. The point is that three people, three situations, and three different answers can all be right.
What a sensor can and cannot tell you
| A sensor can show | A sensor cannot show |
|---|---|
| How fast glucose rises after a particular meal | Whether you have diabetes or prediabetes |
| Overnight and fasting patterns | Why you feel tired, hungry, or foggy |
| How walking, sleep, or meal timing line up with your numbers | What you should eat or whether to change a medicine |
| Whether a change in routine moves your average | Values outside its measuring range |
Because the two over-the-counter sensors have different measuring ranges, a reading that is out of range for one may be visible on the other. That matters most at the extremes, which is one reason people with diabetes are directed toward Stelo or a prescription device.
A simple two-week plan for your first sensor
- Days 1 to 2: Expect some noise while the sensor settles. Eat normally and log meals.
- Days 3 to 7: Keep your usual routine. Mark when you eat, exercise, sleep, and feel tired.
- Days 8 to 12: Change one thing, such as a different breakfast or a walk after dinner, and compare.
- Days 13 to 14: Review the notes. Look at averages and the overall pattern rather than one peak, using how to read your CGM data.
- After: Decide whether a second cycle is worthwhile or whether you have the answer. Bring anything surprising to your clinician.
Prescription CGM: when it is the better route
Prescription systems such as the FreeStyle Libre 3 and the Dexcom G7 add real-time alerts, and are the usual route for people on insulin or those who have had severe lows. They also come with a clinician who can interpret the data and adjust a treatment plan. If any of those apply to you, or your clinician suggests one, the over-the-counter question becomes moot. Our prescription vs over-the-counter CGM guide compares them in more detail.
When the best answer is no device
- You have no specific question and your labs are normal.
- Tracking numbers tends to make you anxious or rigid about food.
- You would not act on the data, or you would act on it by changing prescribed treatment without talking to your clinician.
- You are looking for a diagnosis; only labs and a clinician can provide one. See CGM vs A1C.
Common mistakes when choosing
- Choosing by brand instead of by goal.
- Using an over-the-counter sensor to make medication decisions.
- Treating a normal spike as a problem. Glucose rises after meals in everyone.
- Wearing a sensor without a question. Write the question down first.
- Ignoring symptoms because the graph looks fine.
Questions to bring to your appointment
- Given my labs and history, would a CGM tell us anything new?
- Would a prescription CGM be appropriate and covered for me?
- If I wear an over-the-counter sensor, which readings or patterns should I bring to you?
- Could my tiredness after meals have other causes we should check?
- Is there any reason I should not use a continuous sensor, such as a history of disordered eating?
Disclosure: Metabolic Clarity Labs has no financial relationship with Dexcom or Abbott. This article is general education and not medical advice.
Frequently asked questions
Stelo or Lingo: which is better?
Neither is better for everyone. Stelo is cleared for adults not on insulin, including people with type 2 diabetes; Lingo is aimed at adults without diabetes and is not intended to diagnose any disease. Pick by who you are and what question you are asking, using the tables above.
Which is better for post-meal fatigue?
A sensor can show whether your glucose rises and falls around the time you feel tired, which is useful information to bring to a clinician. It cannot tell you why you are tired, and fatigue after meals has many possible causes. Either over-the-counter sensor can show the pattern; neither diagnoses a cause.
Can I use Lingo if I have type 2 diabetes?
Lingo is positioned as a general wellness tool and is not cleared for diabetes management. If you have diabetes, talk to your clinician; Stelo’s clearance explicitly includes adults with diabetes who do not use insulin, and prescription CGMs are another route.
I take insulin. Can I use either one?
Over-the-counter sensors are not intended for people who use insulin. Insulin users generally need a prescription CGM with real-time alerts, so talk to your prescriber.
Should I skip a CGM altogether?
Often it is reasonable to. If your labs are normal and you have no specific question to answer, a sensor may add little. If you do not want to track numbers closely, or tracking tends to make you anxious, skipping it is a legitimate choice.
What if I have a history of disordered eating?
Abbott’s own labeling advises people with an eating disorder or a history of one to talk with a healthcare professional before changing their diet or exercise routine based on sensor data. A constant glucose graph can reinforce rigid food rules, so speak with a clinician or therapist first.
How long should I wear one to learn something useful?
Many people wear a sensor for one or two cycles, about two to four weeks, long enough to see how typical meals, sleep, and activity look. Read how to read your CGM data before deciding what the graph means.
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.
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