Dexcom One+ vs Dexcom G7 - which sensor to choose?

Dexcom ONE+ sensor

Dexcom ONE+ is a CGM system designed with simplicity and accessibility in mind. It is intended for people who:

• want accurate real-time glucose monitoring,

• do not use an insulin pump,

• expect lower costs while maintaining the quality of the Dexcom brand.

  

Dexcom ONE+ sensor works as a standalone system – it connects to a smartphone app or a receiver and does not integrate with insulin pumps or automated insulin delivery systems (AID).

What is Dexcom G7?

Dexcom G7 is the latest and most advanced generation of Dexcom sensors. This system was designed for:

• insulin pump users,

• people who use or plan to use AID / HCL therapy,

• patients who want a “future-proof” solution with broad compatibility and an expanding ecosystem.

Dexcom G7 is being intensively developed with a strong focus on integration with other medical devices.

Comparison of the key features of both sensors

1. Wear time and startup

Both Dexcom ONE+ and Dexcom G7:

• work for up to 10 days,

• offer a 12-hour grace period,

• have a short warm-up time – only 30 minutes.

This provides significant convenience, especially when sensors are replaced frequently.

2. Calibration – do you need finger pricks?

In both systems:

• calibration is not required,

• optional calibration is possible, for example in cases of significant discrepancies.

For most users, this means full freedom from daily fingerstick measurements.

3. Measurement accuracy

Dexcom G7 has full clinical study data, with a MARD of approximately 8.2%, placing it among the most accurate CGM sensors in the world.
Dexcom ONE+ uses the same generation of technology. The manufacturer communicates accuracy comparable to G7, although marketing materials often refer to data obtained for G7. In everyday use, differences are negligible for most patients.

4. Apps, alerts, and data sharing

Both systems work with Dexcom apps and offer:

• high and low glucose alerts,

• customizable alert thresholds,

• access to Dexcom Clarity (trend analysis),

• the ability to share data with loved ones via Dexcom Follow.

Dexcom G7 allows data sharing with up to 10 followers, which can be particularly important for children or older adults.

5. Integration with insulin pumps – the key difference

This is where the most important difference appears:

Dexcom ONE+
❌ no integration with insulin pumps
❌ no compatibility with AID systems

Dexcom G7
✅ compatibility with selected insulin pumps
✅ suitability for automated insulin delivery therapies (AID / HCL)

If you use a supported insulin pump or plan such therapy, Dexcom G7 is the natural choice.

Which sensor will be better for you?

Dexcom ONE+ is a good choice if:

• you do not use an insulin pump,

• you want a simple, modern CGM,

• lower costs are important to you,

• you value Dexcom accuracy and alerts.

Dexcom G7 will be a better choice if:

• you use an insulin pump or AID,

• you want maximum integration and system development,

• you accept a higher price in exchange for greater functionality.

Summary

Dexcom ONE+ and Dexcom G7 are sensors of the same generation, offering very similar accuracy and user comfort. The difference lies not in measurement quality, but in the scope of use:

• Dexcom ONE+ – an ideal “solo” CGM: simple, effective, and cost-efficient

• Dexcom G7 – an advanced diabetes management hub, ready for pumps and automation

You can purchase both sensor models in our store: Dexcom ONE+ | Dexcom G7