Search for the cost of an over-the-counter CGM and you will find a sensor price, a subscription price, and a multipack price, all with different lengths of wear. The only way to compare them fairly is per day. This guide shows the method, works an example, and lists the extra costs people often forget.
Quick answer: Divide what you pay by the number of days the sensors cover. On example prices reported in recent public sources, both Stelo and Lingo come to roughly three dollars a day, or about $1,000 to $1,300 a year for continuous wear, with longer plans at the lower end. Prices change and plans differ, so treat the figures as an illustration and confirm current prices on each manufacturer’s site.
Why you must compare per day
Stelo sensors are described as lasting up to 15 days, and Lingo sensors up to 14 days (GoodRx guide to over-the-counter CGMs). A one-day difference per sensor sounds trivial, but over a year it changes how many sensors you need: about 24 Stelo sensors against about 26 Lingo sensors for continuous wear. Comparing the price of one box to another box ignores that. Per-day cost removes the problem.
The cost formula
- Price paid for the plan (one-time pack, monthly subscription, or multi-month plan).
- Days covered by that plan (sensors included times days per sensor).
- Per-day cost = price paid ÷ days covered.
- Per-month cost = per-day cost × 30.
- Per-year cost = per-day cost × 365.
Fill in your own numbers from the checkout page. The rest of this article uses example prices to show how it works.
A worked example with reported prices
The following prices were reported by the GoodRx guide to over-the-counter CGMs, which dates them to December 2024, and a mid-2026 review reported consistent figures for the core prices (about $99 for two Stelo sensors and $49 for one Lingo sensor; it put Lingo’s four-week supply at about $91 against GoodRx’s $89). They are examples, not current quotes.
| Plan | Price | Days covered | Per day | Per 30 days | Per year |
|---|---|---|---|---|---|
| Stelo, two sensors (one-time) | $99 | 30 | $3.30 | $99 | about $1,204 |
| Stelo, monthly subscription | $89 | 30 | $2.97 | $89 | about $1,083 |
| Stelo, three-month plan | $252 | 90 | $2.80 | $84 | about $1,022 |
| Lingo, one sensor | $49 | 14 | $3.50 | $105 | about $1,278 |
| Lingo, two sensors | $89 | 28 | $3.18 | $95 | about $1,160 |
| Lingo, 12-week plan | $249 | 84 | $2.96 | $89 | about $1,082 |
Check one row by hand: $89 ÷ 30 days = $2.97 a day. Multiply by 365 and you get about $1,083. The same math for Lingo’s 12-week plan gives $249 ÷ 84 = $2.96 a day, or about $1,082 a year. Their long-plan prices are nearly identical.
The pattern matters more than any single price: buying one sensor at a time is the most expensive way to wear either device, and the longer plans save roughly 15 percent per day in these examples.
Cost of a short trial
Most people do not need a CGM for a whole year. If your goal is to learn how your regular meals affect you, a trial of two to four weeks is often enough to see patterns.
| Trial | Example cost | Days of data |
|---|---|---|
| One Lingo sensor | $49 | 14 |
| Two Lingo sensors | $89 | 28 |
| Two Stelo sensors | $99 | 30 |
One Lingo sensor is the lowest-cost way in at the example prices, while two Stelo sensors give the most days for the money in a single purchase. Neither number includes extras.
Hidden and extra costs
- Overpatches or tape. If the adhesive irritates your skin or the sensor starts to peel, some wearers add an overpatch. The cost varies by brand and is not in the sensor price.
- Replacement of failed sensors. Sensors can detach early or stop reporting. Ask each company how it handles replacements before you buy.
- Shipping and subscription terms. A subscription can renew automatically; read the cancellation terms.
- A phone that works with the app. Both devices rely on a compatible smartphone.
- The cost of acting on the data. A sensor can tempt people to buy supplements, special foods, or coaching. Decide in advance what you will do with the information.
How the cost compares with other options
| Option | Typical cost pattern | What you get |
|---|---|---|
| Over-the-counter sensor | Cash price, roughly $3 a day in the examples above | A continuous graph, no high/low alarms |
| Prescription CGM | Depends on insurance, with a manufacturer coupon sometimes available | Real-time alerts and a clinician-guided plan |
| Fingerstick meter | Meter plus strips, usually a small recurring cost | Spot checks at times you choose |
| Lab tests | Often covered when a clinician orders them | Diagnostic values such as fasting glucose and A1C |
If cost is the main concern, our guide to Lingo alternatives covers the cheaper routes, and best blood sugar meter for beginners covers the meter option.
Is it worth the money?
That depends on what you will do with the information. A graph does not change your glucose by itself. It is worth the money when it answers a specific question, helps you and your clinician see something your labs miss, or keeps you honest during a defined experiment. It is not worth it if you will buy it, glance at it a few times, and stop. Before you spend, read do you need a CGM with prediabetes and CGM vs A1C to decide what question you are trying to answer. After you start, how to read your CGM data keeps you from over-reading a single spike. For which device suits which goal, see which CGM is right for your goal, and for the feature-by-feature view, the Stelo vs Lingo comparison.
Stelo is described as FSA- and HSA-eligible by the diaTribe overview of Stelo; ask your plan whether any CGM purchase qualifies.
Three cost scenarios
| Scenario | What you do | Example spend |
|---|---|---|
| Short curiosity trial | Wear one cycle, then stop | About $49 to $99 |
| Seasonal check-ins | Two or three cycles a year, for example after a diet change | About $150 to $300 |
| Continuous wear | Wear sensors all year | About $1,000 to $1,300 on the example plans |
For many people the first row answers their question. The third makes sense mainly when a clinician recommends continuous tracking, in which case a prescription route may be worth comparing because insurance can change the numbers.
How to avoid wasting sensors
Each early failure is money lost, so a few habits are worth the effort. Clean and dry the skin before applying and follow the instructions about placement. Avoid areas where clothing or a bag strap rubs. Be careful when showering, swimming, or changing clothes in the first day or two, when adhesive is still settling. If you are active or sweat heavily, an overpatch can help the sensor stay put, though you should check that anything you use is safe for your skin. Contact the company promptly if a sensor fails, since policies on replacement vary and time limits may apply.
One-time purchase or subscription?
One-time packs let you try a device without a commitment, but they cost more per day in the examples above. A subscription lowers the per-day price and keeps sensors arriving on schedule, but you must remember to pause or cancel when you are done. If you are not sure you will keep using a sensor, start with a one-time purchase, then switch only if you decide to wear one continuously. Read the cancellation terms before you enter a card number.
Common mistakes when comparing cost
- Comparing sensor prices without comparing days.
- Assuming a launch price is current. Check the checkout page.
- Forgetting extras such as overpatches and shipping.
- Buying a long plan before you know you will use it. Start short.
- Treating cash-pay and insured costs as the same thing. A prescription route can look very different once insurance applies.
Questions to bring to your appointment
- Would a CGM change anything in my care, or would labs and a food log do the job?
- Would insurance cover a prescription CGM for me?
- If I try a sensor for a few weeks, what should we review together afterward?
- Is there any reason a cash-pay sensor would be a poor fit for my situation?
Disclosure: Metabolic Clarity Labs has no financial relationship with Dexcom or Abbott. Prices, plans, and clearances change; verify with the manufacturer.
Frequently asked questions
Which is cheaper, Stelo or Lingo?
On the example prices in this article they land within about a dollar a day of each other, and which one is cheaper depends on the plan you buy. A longer plan lowers the per-day cost for both. Because sensors last different numbers of days, always compare per day, not per sensor.
Does insurance cover Stelo or Lingo?
They are sold as cash-pay products, and the diaTribe overview notes that Stelo is not covered by insurance. Stelo is described as eligible for FSA and HSA spending; ask your plan administrator about Lingo and about your own plan’s rules.
Is a prescription CGM cheaper?
Sometimes, but not always. With insurance, a prescription CGM can cost much less out of pocket, and manufacturer coupon programs exist for some devices. Without coverage, cash prices vary. The only reliable answer comes from your insurer and pharmacy. See prescription vs over-the-counter CGM.
Do I have to wear a CGM all year?
No. Many people wear one for a defined period, such as one or two sensors, to learn how their usual meals affect them, then stop. A short trial costs a small fraction of the annual figures above.
What other costs should I plan for?
Possible extras include overpatches or tape if the adhesive irritates your skin or the sensor lifts early, replacement of a sensor that fails or detaches (ask each company about its replacement policy), and shipping. None of these appear in the headline prices.
Do the prices change?
Yes. The example prices here come from recent public reports and may be out of date by the time you read this. Check the manufacturer’s site before you buy.
How do I calculate my own cost?
Divide the price you will pay by the number of days the sensors cover, then multiply by the number of days you plan to wear one. The step-by-step method is in this article.
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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