Recommended Free Tools
iTechGuides is reader-supported. When you buy through links on our site, we may earn an affiliate commission. As an Amazon Associate I earn from qualifying purchases. Learn more
No—an Apple Watch does not measure blood glucose on its own. It can display readings from a separate continuous glucose monitor (CGM). Dexcom G7 Direct to Watch is a documented option that sends readings and alerts from its sensor to a compatible Apple Watch, but you still need an iPhone for setup and new sensor pairing.
How glucose readings get to an Apple Watch
In this setup, the Apple Watch is a display, not the glucose sensor. The Dexcom G7 is a prescription CGM that measures glucose in interstitial fluid using a wearable sensor and transmitter. Its readings can be viewed through a phone app, a receiver, or—when configured—a compatible Apple Watch. The FDA’s device review describes Direct to Watch as an option for receiving glucose data and alerts when the iPhone is not nearby.
Direct to Watch versus phone mirroring
| Mode | How readings reach the watch | Phone needed nearby? | Setup and limits |
|---|---|---|---|
| Standard watch display | The watch mirrors data from the iPhone app. | Yes, for the phone-to-watch connection. | Readings depend on the phone app and its connection to the watch. |
| Dexcom G7 Direct to Watch | The G7 sensor transmitter sends readings and alerts directly to the watch over Bluetooth. | Not for the direct sensor-to-watch connection once configured and working. | Use the iPhone app to pair each new sensor and enable/configure Direct to Watch. Some data-sharing features may differ; confirm current Dexcom instructions. |
Direct to Watch does not make the whole CGM system phone-free: the iPhone app is needed to start and configure a new sensor session. Dexcom says the watch may fall back to copying from the phone if the direct connection temporarily fails; keep the phone nearby when the interface indicates that fallback. See the Dexcom Direct to Watch FAQs for current behavior and setup guidance.
The Tool Desk
Outbyte PC Repair FREEClear out junk files and repair common Windows errorsFree Scan →Outbyte Driver Updater FREEScan for outdated or missing drivers - takes under a minuteDriver Scan →Compatibility and setup requirements
Dexcom lists an Apple Watch Series 6 or later with watchOS 10 or later, an iPhone with iOS 17 or later, and a compatible G7 app as requirements. Requirements can change, so check Dexcom’s live compatibility and setup information before buying or updating devices. A cellular plan is not required for the watch-to-sensor Bluetooth connection.
#1 Best Overall
- HSA/FSA eligible. No prescription needed.
- 24/7 GLUCOSE TRACKING. See your glucose response to food, exercise, sleep, and other lifestyle factors via the Lingo app.
- OPTIMIZE YOUR NUTRITION. Discover which foods work for you and those that don't. The Lingo app shows you how specific meals and other factors impact your glucose, so you can learn from your insights and build healthier habits
- NAVIGATE PREDIABETES WITH A NEW VIEW OF YOU. More time in healthy glucose range is linked to lower diabetes risk. Three out of four users with prediabetes say Lingo was effective in helping to achieve their health goals¹.
- HEALTHY GLUCOSE SUPPORTS HEART HEALTH. What you eat matters to your glucose and your heart. Keeping your glucose in a healthy range (70–140 mg/dL) more often can help protect your heart from heart disease²⁻⁴.
- Install and set up the compatible Dexcom G7 app on the iPhone.
- Pair the G7 sensor through the phone app when starting a new sensor session.
- In the G7 app, open Connections > Direct to Watch and enable/configure the feature.
- Use the watch to view current glucose, trend direction or graph, and alerts. Follow the app interface if it reports a connection issue or phone-mirroring fallback.
Dexcom announced U.S. availability on June 5, 2024, and named the United Kingdom and Ireland at launch, with additional markets planned. That is a dated launch statement, not a complete current country list; check Dexcom for availability where you live. Dexcom’s announcement gives the launch details.
Why glucose-measuring watch claims deserve caution
The FDA states that no smartwatch or smart ring has been authorized, cleared, or approved to measure or estimate blood glucose on its own. That warning is different from an app displaying readings from an authorized CGM that uses a sensor. The FDA cautions that inaccurate readings can lead to medication errors, including an incorrect insulin dose or use of medicines that rapidly lower glucose. Do not rely on a watch or ring claiming non-invasive glucose measurement; ask a healthcare provider about an appropriate authorized device when medically accurate measurements matter. Read the FDA safety communication.
Rank #2
- HSA/FSA eligible. No prescription needed.
- 24/7 GLUCOSE TRACKING. See your glucose response to food, exercise, sleep, and other lifestyle factors via the Lingo app.
- OPTIMIZE YOUR NUTRITION. Discover which foods work for you and those that don't. The Lingo app shows you how specific meals and other factors impact your glucose, so you can learn from your insights and build healthier habits.
- NAVIGATE PREDIABETES WITH A NEW VIEW OF YOU. More time in healthy glucose range is linked to lower diabetes risk. Three out of four users with prediabetes say Lingo was effective in helping to achieve their health goals¹.
- HEALTHY GLUCOSE SUPPORTS HEART HEALTH. What you eat matters to your glucose and your heart. Keeping your glucose in a healthy range (70–140 mg/dL) more often can help protect your heart from heart disease²⁻⁴.
Keep the G7 app and watch software current
Software matters because missing or delayed alerts can affect how useful a CGM display is. In a July 24, 2025 notice, the FDA described a correction for older Dexcom G7 app versions: a transmitter hardware or firmware failure could end a sensor session without a “Sensor Failed” alert, leaving the user unaware that readings and alerts had stopped. The notice said affected app versions had to be updated. Read the FDA notice.
Quick wins for a faster PC:
Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Clear out junk files and repair common Windows errorsFree Scan →A separate FDA Class 2 recall record describes an April 14, 2026 correction for G7 iOS/watchOS app versions 2.9.0 through 2.11.2. A software defect could replay older estimated glucose values and delay alerts. Because the installed version and current correction instructions depend on your device, check Dexcom’s current app guidance and the FDA recall record.
Quick Recap
Rank #4
- The information below is per-pack only
- HSA/FSA eligible. No prescription needed.
- 24/7 GLUCOSE TRACKING. See your glucose response to food, exercise, sleep, and other lifestyle factors via the Lingo app.
- OPTIMIZE YOUR NUTRITION. Discover which foods work for you and those that don't. The Lingo app shows you how specific meals and other factors impact your glucose, so you can learn from your insights and build healthier habits
- NAVIGATE PREDIABETES WITH A NEW VIEW OF YOU. More time in healthy glucose range is linked to lower diabetes risk. Three out of four users with prediabetes say Lingo was effective in helping to achieve their health goals¹.
Rank #3
- ✅ For people NOT using insulin, ages 18 years and older
- ❌ Don’t use if: On insulin, on dialysis, if you have problematic hypoglycemia, are modifying medication without HCP consultation, or if you have a history of eating disorders
- YOUR SUCCESS, OUR COMMITMENT: Should you experience an issue with your biosensor before its 15-day wear is up,[2] we’ll replace it for free. [3]
- POWERFUL FEATURES: Get AI-powered coaching, plus discover in-app nutrition & glucose insights, advanced meal and activity logging, trend summaries and deep dives, pattern insights and much more—plus, effortlessly sync your data with Apple Health, Google Health Connect, and Oura.
- PRODUCT SUPPORT: Provided by Stelo through SteloBot, which can be accessed via the Stelo app by going to Settings > Contact. SteloBot virtual support assistant is available 24/7, and live agent support available during regular business hours.
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
