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A free scan shows the junk files, broken settings and background clutter dragging Windows down - then fixes them in one click.Free scan · Windows 10 & 11A smartwatch can show glucose readings from a compatible continuous glucose monitor (CGM), but it does not measure glucose itself. In the U.S., the documented Apple Watch route is Dexcom G7: the watch can mirror readings from the iPhone app or, with Direct to Watch enabled, receive readings and alerts from the G7 transmitter. The G7 is a prescription CGM; check current device compatibility, app versions, and safety notices before relying on it.
What a smartwatch does—and does not do
A CGM sensor inserted under the skin measures glucose in interstitial fluid. Its transmitter calculates estimated glucose values and sends them to a supported display, such as a phone, receiver, or compatible smartwatch. The watch is a screen for CGM data, not a non-invasive glucose sensor.
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The FDA says it has not authorized, cleared, or approved any smartwatch or smart ring intended to measure or estimate glucose on its own. It warns that inaccurate readings can lead to harmful diabetes-treatment decisions, including taking the wrong amount of insulin or another glucose-lowering medicine. See the agency’s February 21, 2024 safety communication.
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The FDA-reviewed G7 system includes a sensor, transmitter, and at least one display device. For compatible Apple users, that can include the G7 iPhone app and Apple Watch app. The reviewed system is prescription-only and intended for diabetes management. Its two watch modes differ mainly in whether the iPhone must stay nearby.
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- 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.
| Mode | How readings reach the watch | Phone needed nearby? |
|---|---|---|
| Standard smartwatch mode | The G7 Watch App mirrors data from the iPhone G7 app. | Yes. The phone must be close to the watch. |
| Direct to Watch | After setup, the watch app connects directly to the G7 transmitter for estimated glucose values and alerts. | No, not for receiving readings and alerts once enabled; the iPhone app is still used for setup and settings. |
These modes and their setup requirements are described in the FDA’s G7 review and Dexcom’s Direct to Watch guidance. Direct to Watch requires a compatible iPhone and Apple Watch, an active sensor session, and enabling/configuring the feature in the iOS app. The FDA review does not provide a complete current model-by-model compatibility list, so confirm supported models, operating systems, and app versions in Dexcom’s live compatibility information before purchase or use.
Set up tracking and keep a backup display
- Confirm compatibility first. Check the manufacturer’s current phone, watch, operating-system, and app requirements. Do not assume every Apple Watch or iPhone works.
- Use the iPhone app to start and configure. Start the G7 sensor session in the app. To use Direct to Watch, enable and configure that feature there, then follow Dexcom’s current in-app instructions.
- Check connectivity and alert settings. Bluetooth and recommended device settings are part of the workflow. Confirm that readings and alerts appear on the intended display rather than assuming pairing alone is sufficient.
- Retain access to another display. The phone app can remain an alternative, and the separate G7 receiver is another display option that can communicate with the transmitter and show readings, graphs, and alerts. A watch is optional, not the CGM itself.
- Review current safety notices and updates. Check FDA and manufacturer notices for the specific app version you use and install required corrections before relying on readings or alerts.
What the G7 specifications mean in practice
The FDA-reviewed submission describes Bluetooth Low Energy communication, a reportable range of 40–400 mg/dL, with values outside that range shown as LOW or HIGH, and wear of up to 10 days plus a 12-hour grace period. These are details for the reviewed G7 system submission; they should not be treated as universal CGM specifications or assumed to apply to every market or product generation. Follow the labeling for your device.
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- 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.
Why app versions and corrections matter
Watch alerts and readings depend on functioning software as well as compatible hardware. FDA’s recall record says a correction initiated April 14, 2026, and posted May 11, 2026, covered G7 watchOS app versions 2.9.0 through 2.11.2. The issue could delay glucose-value and alert processing, creating a risk of missed detection or decisions based on outdated information. The FDA record showed the recall as open/classified when accessed for this article; check the live FDA record for current status and follow Dexcom’s correction instructions.
A separate FDA notice describes a failure-to-alert issue after transmitter failure in specified older G7 app versions. Those affected versions were to be updated; the notice is not evidence that every current app version is affected. Check the FDA correction notice and manufacturer guidance for the versions and instructions that apply to your setup.
Rank #3
- 【Advanced Health Fitness Tracker】-This fitness tracker offers 24/7 heart rate and blood pressure monitoring to help you stay proactive about your health goals. It also supports on-demand blood oxygen checks, so you can quickly see your O₂ level whenever you need it. Detailed sleep tracking (deep sleep, light sleep and wake-ups) and all-day activity tracking give you a clearer picture of your overall health trends. (Inspire a healthy life, not for medical use
- 【All-Day Activity & Fitness Tracking】-The MorePro fitness tracker for women and men offers 120+ sport modes including running, walking and more, so you can track the workouts you actually do. With a built-in pedometer step counter, this smart watch records steps, distance, calories burned, heart rate and training time in real time, giving you clear references for exercise intensity. Whether you’re at the gym, on a run or playing ball with friends, every workout becomes safer, more efficient and easier to enjoy
- 【Women’s Health & Cycle Tracking】-Designed as a women’s health tracker, the smart watches for women offers intuitive menstrual cycle tracking right on your wrist. Use the built-in period tracker to log your menstrual period, safe days, ovulation window and ovulation day, while the app supports period mode, trying-to-conceive mode and pregnancy mode to match different life stages. Whether you’re at work, in class or relaxing at home, gentle women’s health reminders help you prepare in advance with the right clothes and pads, so every month feels more predictable and in control
- 【Everyday Smart Lifestyle Companion】-Stay connected without constantly checking your phone. This smart watch fitness tracker delivers real-time call, SMS and app message notifications on your wrist, so you can see who’s contacting you while you’re in a meeting, commuting or working out. The IP68 waterproof design easily handles sweat, rain and hand-washing. With over 200 watch faces and simple DIY custom faces using your own photos, you can quickly match your watch to business, workout or casual looks
- 【Practical Daily Smart Tools】-From sedentary reminders and drink water reminders to on-wrist weather forecasts, this smart watch helps you build healthier routines at work or while studying. Use music control and camera control while your phone stays in your bag, and rely on the stopwatch, timer, alarm clock and find my phone features to keep workouts, cooking and busy mornings on track
Choosing a display route
- For convenience: A compatible watch can put CGM data and alerts on your wrist. Standard mirroring depends on a nearby iPhone; Direct to Watch avoids that proximity requirement after setup.
- For redundancy: Consider whether you can also access the phone app or a separate receiver, rather than making the watch your only display.
- For compatibility: Verify exact supported devices and software with the manufacturer; general Apple Watch ownership alone does not establish support.
- For clinical fit: Because the G7 is a prescription system, discuss whether it is appropriate for you with your healthcare professional.
The FDA announced U.S. authorization of Abbott’s Libre Duo 10 Day Continuous Dual Glucose Ketone Monitoring System on August 25, 2026, for people aged 2 and older living with diabetes. The announcement describes readings sent wirelessly to a compatible smartphone, but does not establish smartwatch-display support. Do not assume Libre Duo works with a watch unless its current official compatibility documentation confirms that feature.
Quick Recap
Rank #4
- Real-Time CGM Display – Projects continuous glucose monitor data directly onto your ceiling or wall so you can see blood glucose levels and trend arrows instantly.
- Compatible with Leading CGMs – Works seamlessly with Dexcom, Libre, and all Nightscout compatible sensors and platforms, so you get accurate glucose tracking you trust.
- Glucose Alarm & Alerts – Set your own custom range low or high thresholds so you have peace of mind that this device will catch and alert you when you're out of range - no matter if it is day or night.
- Multi-User Monitoring Capability – Supports glucose tracking for up to three users, perfect for families and parents monitoring both child and adult glucose levels.
- Sleep-Friendly Low-Light Display – With a purpose built projector for nighttime use, the display minimizes glare, projects in a sleep-friendly soft red glow, and avoids sleep interruption from bright screens, making it ideal for night time glucose monitoring.
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