Dexcom ONE vs G7: Key Differences Explained

Dexcom ONE vs G7: Which CGM Sensor Is Right for You?

Choosing the right continuous glucose monitor can feel overwhelming, especially when two strong options sit side by side on the shelf. The Dexcom ONE and the Dexcom G7 are both trusted CGM sensors, but they serve different users in meaningfully different ways. This guide breaks down everything you need to know so you can make a confident, informed decision about your diabetes supplies.

Overview: What Are These Devices?

The Dexcom ONE is a streamlined, straightforward CGM designed for simplicity. It was built to give real-time glucose readings without overwhelming users with features they may not need. The Dexcom G7, on the other hand, is Dexcom's most advanced consumer CGM, packed with next-generation features for those who want detailed data integration and tighter control.

Key Differences at a Glance

1. Warm-Up Time

One of the most practical differences is how fast each sensor gets going. The Dexcom G7 has a 30-minute warm-up period, a significant improvement over previous generations. The Dexcom ONE requires a 2-hour warm-up, which can feel like a long wait when you're eager for real-time readings.

2. Sensor Wear Time

Both sensors offer 10 days of continuous wear. However, the G7 includes a unique 12-hour grace period, giving you extra time to replace your sensor without a gap in readings — a helpful feature for busy days when changing sensors isn't convenient.

3. Size and Design

The Dexcom G7 is approximately 60% smaller than previous Dexcom models and features a fully integrated transmitter and sensor in one disposable unit — no separate transmitter to manage. The Dexcom ONE also has an integrated design but is slightly bulkier by comparison.

4. Accuracy

Both devices are highly accurate, but the G7 holds a MARD (Mean Absolute Relative Difference) of around 8.2%, making it one of the most accurate CGMs commercially available. The Dexcom ONE performs reliably for everyday glucose monitoring, though its accuracy metrics are slightly less refined.

5. Connectivity and App Integration

The Dexcom G7 integrates directly with a wide range of insulin pumps, including closed-loop systems, and connects to the Dexcom G7 app with enhanced data sharing for up to 10 followers. The Dexcom ONE app is more basic, offering core readings and alerts without the advanced integrations — ideal for users who don't need pump connectivity.

6. Alerts and Customization

The G7 offers more customizable alert settings, including an Urgent Low Soon alert that warns you up to 20 minutes before a dangerous glucose drop. The Dexcom ONE provides essential high and low alerts, which are more than sufficient for many users.

Which One Should You Choose?

• Choose Dexcom ONE if: You want a simple, reliable CGM without complex integrations, or if you're new to CGM therapy.
• Choose Dexcom G7 if: You use an insulin pump, want the fastest warm-up, need advanced data sharing, or prefer the smallest possible sensor footprint.

Where to Buy Dexcom ONE and G7 Sensors

You can shop both the Dexcom ONE and Dexcom G7 sensors at mdsdiabetes.com. MDS Diabetes offers competitive pricing on CGM supplies, with a straightforward ordering process designed specifically for diabetes patients and caregivers. Whether you're stocking up on sensors or exploring CGM options for the first time, MDS Diabetes makes it easy to get what you need delivered to your door.