Choosing between the Dexcom G7 and FreeStyle Libre 3 is the most common question in CGM today. Both are excellent — but they suit different needs. This comparison breaks down accuracy, cost, alerts, and usability so you can decide.
Quick Verdict
Dexcom G7 wins for real-time alerts and tighter glucose control. FreeStyle Libre 3 wins for cost and simplicity. Neither is universally better.
Accuracy (MARD)
The Dexcom G7 has a MARD (Mean Absolute Relative Difference) of 8.2%, while the FreeStyle Libre 3 comes in at 7.8% — clinically equivalent for most users. Both perform worse during rapid glucose changes, which is expected of all interstitial CGMs.
Alerts and Alarms
The G7’s biggest advantage: customizable urgent low alerts (as low as 55 mg/dL), predictive alerts, and high/low thresholds you can set independently. Libre 3 added alarms in 2023 but the customization is more limited.
If you sleep alone and hypoglycemia is a real concern, the G7’s alarm system is superior.
Warm-Up Time
G7: 30 minutes. Libre 3: 60 minutes. Both have improved significantly from earlier generations.
Wear Time
G7: 10 days + 12-hour grace period. Libre 3: 14 days. If minimizing sensor changes matters, Libre 3 has the edge.
Cost (US Market, 2026)
- Dexcom G7: ~$350-400/month without insurance. With Medicare Part B: covered if you qualify.
- FreeStyle Libre 3: ~$120-150/month without insurance. Significantly cheaper OOP.
Abbott’s FreeStyle Libre 3 is roughly 2-3x cheaper without insurance, which is decisive for many.
App and Integration
Both integrate with Apple Health and Android. Dexcom has native Apple Watch complications. Libre 3 works with the LibreLink app (clean and simple). Both support share/follow features for caregivers.
Who Should Choose What
- Type 1 diabetes, active, need alarms: Dexcom G7
- Type 2, uninsured or cost-conscious: FreeStyle Libre 3
- Pediatric use (under 4): Dexcom G7 (FDA approved for younger children)
- Longest sensor life: FreeStyle Libre 3 (14 days)
Disclaimer: This is informational content. Consult your diabetes care team before changing CGM devices.