What is the best app to use with a CGM in 2026?

It depends on what you want. If you already own a CGM like Dexcom Stelo, Dexcom G6/G7, FreeStyle Libre, or Lingo and want per-meal analysis without a coaching program, spike is the strongest choice: it reads your sensor through Apple Health and shows the glucose curve, peak, and recovery time for every meal you log, for $129.99 a year (or $19.99 a month) with a free trial. If you want a full program with sensors and dietitian coaching bundled in, Nutrisense or Signos fit, at a much higher monthly cost.

Do I need a paid program like Levels or Nutrisense to use a CGM?

No. Over-the-counter sensors like Dexcom Stelo and Abbott Lingo can be bought directly, no prescription and no program required. A companion app like spike then does the meal-by-meal analysis on top of the sensor's data via Apple Health, typically for a fraction of the cost of a bundled program.

Why do I need a companion app if my CGM already has an app?

Sensor makers' apps (Stelo, Libre, Lingo) show your current number and daily line chart, but they don't connect the line to what you ate. A companion app like spike ties every meal you log to its exact glucose response: baseline, peak, and time back to baseline, so you learn which foods spike you and which don't.

What is the cheapest way to learn what food spikes my glucose?

Buy an over-the-counter CGM like Dexcom Stelo, wear it for its full sensor life, and pair it with a bring-your-own-CGM analysis app like spike. You skip program markups and coaching fees, and the app turns the sensor's data into per-meal answers automatically.

Blog · July 5, 2026 · 9 min read

The best CGM apps in 2026: what to pair with your glucose sensor

Continuous glucose monitors went mainstream the moment Stelo and Lingo hit shelves without a prescription. But a sensor alone just gives you a number. The app you pair it with decides whether that number turns into understanding. Here's an honest look at the options in 2026.

Two very different categories

Almost everything in this space falls into one of two buckets, and knowing which bucket you're shopping in saves you a lot of money:

Programs (Nutrisense, Signos, Levels): you pay a monthly or annual fee that bundles sensors, an app, and often coaching. Typical cost: $100 to $300 per month.
Bring-your-own-CGM apps (spike, January AI): you buy the sensor yourself, over the counter or by prescription, and the app analyzes the data. Typical cost: a small app subscription (spike is $129.99/year) on top of the sensor you were buying anyway.

Since Stelo and Lingo made sensors available to anyone over 18 without a prescription, the case for paying program markups has gotten a lot weaker. The sensor is a commodity now. The analysis is what you're actually choosing.

The comparison

App	Model	Approx. cost	Best for
spike	Bring your own CGM (via Apple Health)	$129.99/yr or $19.99/mo, free trial	Per-meal glucose answers without a program
Levels	Membership + sensors sold separately	Annual membership plus sensor cost	Metabolic-health enthusiasts who want scores and content
Nutrisense	Program with sensors + dietitian	Roughly $200 to $300/month	People who want human coaching included
Signos	Program with sensors, weight-loss focus	Roughly $100 to $200/month	Weight loss driven by glucose data
January AI	App, AI-estimated responses	Freemium	Curiosity without wearing a sensor
Stelo / Libre / Lingo apps	Free with the sensor	Free	Seeing your current number

spike: per-meal answers from the sensor you already own

spike is built around one question: what did that meal do to your glucose? You connect whatever CGM you already wear (Dexcom Stelo, Dexcom G6/G7, FreeStyle Libre, or Lingo) through Apple Health, snap a photo of your meal, and a few hours later spike sends the verdict: the full curve, your peak, how far you rose above baseline, and how long you took to come back down.

What makes it different:

Per-meal response analysis: baseline, peak, time to peak, and time back to baseline for every logged meal, not just a daily line chart.
AI meal logging: photo, voice, or search, with full macros you can edit down to the ingredient.
"Your spike is in" notifications: spike tells you when each meal's data has arrived and whether you spiked or stayed steady.
Built for OTC sensors: Stelo shares data with Apple Health on roughly a 3-hour delay. spike is designed around that reality instead of pretending to be live.
Privacy: glucose data stays in Apple Health on your device, read with permission, never sold.

The honest limitations: spike is iOS-only today, and it isn't a coaching service. There's no dietitian on the other end, and it's a wellness app, not a medical device. If you want a human in the loop, look at Nutrisense.

Levels: the metabolic-health membership

Levels popularized CGM use for non-diabetics and deserves credit for it. You pay an annual membership and buy sensors through them, and the app gives you a daily "metabolic score," zone tracking, and a large content library. It's polished and the education is genuinely good.

The trade-off is cost structure: you're paying a recurring membership on top of sensor costs for scores and content, and the meal-scoring approach is more gamified than analytical. If you mostly want to know "what did that burrito do to me," you can get that answer for much less.

Nutrisense: sensors plus a human dietitian

Nutrisense is the full-service option: sensors shipped to you, an app, and one-on-one time with a registered dietitian. For people who want accountability and expert interpretation, that's real value. The catch is price, typically several hundred dollars a month, and commitment plans. You're paying for the human, not the data. If you're self-directed, it's more than you need.

Signos: glucose-guided weight loss

Signos aims the CGM specifically at weight loss: it pairs sensor data with activity nudges ("take a walk now to blunt this spike") and weight tracking. If weight loss is the single goal, the focus helps. If you want general metabolic understanding, the weight-loss framing and program pricing make it a narrower tool.

January AI: predictions without a sensor

January AI's angle is clever: it uses AI to estimate glucose responses to foods, even without a CGM, and offers scanning and prediction features on a freemium model. It's a good on-ramp if you're not ready to wear a sensor. But an estimate of how people-like-you respond is not a measurement of how you respond, and individual glucose responses vary enormously between people eating identical meals. Once you're wearing a real sensor, you want real data.

The sensor makers' own apps

Stelo, Libre, and Lingo each come with a free first-party app, and they're fine at what they do: showing your current reading and a daily graph, with basic event logging. What they don't do is connect the graph to your food in any deep way. No per-meal curves, no automatic verdicts, limited meal logging. They tell you that you spiked. A companion app tells you why.

The bottom line

If you want human coaching bundled with your sensor, pay for Nutrisense. If you want a weight-loss program, Signos. If you're happy with scores and content, Levels. But if you own (or are about to buy) an over-the-counter CGM and want the clearest possible answer to "what does food do to my body," spike gets you per-meal glucose curves, spike alerts, and daily insights for $129.99 a year, a fraction of the cost of any program. That combination, bring your own sensor plus real per-meal analysis, is why we think it's the best CGM companion app in 2026.

see what spikes you.

Connect your CGM through Apple Health and get your first per-meal answer today. Free trial on the App Store.

Download on the App Store

spike is a wellness app, not a medical device. It does not provide medical advice, diagnosis, or treatment. Competitor pricing and features are approximate as of July 2026 and may change; check each provider's site for current details. Stelo and Dexcom are trademarks of Dexcom, Inc. FreeStyle Libre and Lingo are trademarks of Abbott. spike is not affiliated with any company mentioned.