FreeStyle Libre 3 vs Dexcom G7: The Complete Senior’s Comparison Guide for 2025

This article provides general information about continuous glucose monitoring systems, including a comparison of Freestyle Libre 3 vs Dexcom G7. Always consult your healthcare provider for personalized medical advice. Medicare coverage details are current as of January 2025.

Choosing between the FreeStyle Libre 3 vs Dexcom G7 can feel overwhelming, especially if you’re new to continuous glucose monitoring (CGM). As fellow seniors often tell us, both systems have their strengths, and we’re here to help you understand exactly how they compare in 2025.

Before we dive into the details, it’s important to address a significant development: Dexcom recently issued a major recall affecting over 33,000 G6 receivers due to battery overheating issues. They’ve recalled over 2 million G7s as well which has understandably raised concerns about Dexcom’s quality control and what it might mean for seniors considering their products.

Quick Overview: FreeStyle Libre 3 vs Dexcom G7

Both systems help you track your blood sugar without finger sticks, but they work quite differently. Let’s break down the key features in simple terms:

Size and Comfort:

FreeStyle Libre 3: Smallest CGM available (size of 2 stacked pennies)
Dexcom G7: 60% smaller than G6 but still larger than Libre 3

Key Specifications:

Wear Time: Both last 14 days (though G7 has 12-hour grace period)
Readings: Both update every 5 minutes
Warm-up Time: Libre 3 = 60 minutes, G7 = 30 minutes
Alarms: Both offer customizable high/low alerts
Medicare Coverage: Both covered under Part B with qualifying conditions

The Dexcom Recall: What Seniors Need to Know

In December 2024, Dexcom issued a Class II FDA recall for approximately 33,700 G6 receivers due to battery swelling and overheating risks. Here’s what this means for you:

Recall Details:

Affected Product: G6 receivers (NOT the G7)
Issue: Battery can swell, causing device to overheat
Risk: Potential burns or fire hazard
FDA Classification: Class II (moderate risk)
User Reports: Multiple injuries reported

What This Means for G7 Consideration:

While the G7 uses different technology and isn’t affected by this recall, it raises important questions:

Quality control concerns at Dexcom
Importance of monitoring device performance
Value of considering alternative options
Need for vigilance with any medical device

Important Note: If you currently use a G6 receiver, contact Dexcom immediately at 1-888-738-3646 for replacement instructions.

Detailed Feature Comparison

Let’s examine how FreeStyle Libre 3 vs Dexcom G7 compare in areas that matter most to seniors:

Ease of Application

Many seniors tell us that sensor application is their top concern. Here’s an honest comparison:

FreeStyle Libre 3 Application:

Process: One-piece applicator, single push
Difficulty: Easier for arthritic hands
Time Required: 30 seconds
Pain Level: Minimal (like a quick tap)
Can Apply: With one hand if needed
Applicator: Automatic retraction, no exposed needle

Dexcom G7 Application:

Process: Fold-and-press design
Difficulty: Requires more dexterity
Time Required: 1-2 minutes
Pain Level: Similar to Libre 3
Can Apply: Usually needs two hands
Applicator: More steps but still manageable

💡 Senior Tip: If you have arthritis or limited hand mobility, the Libre 3’s simpler applicator might be the better choice.

Size and Wearability

For seniors concerned about sensor visibility and comfort:

FreeStyle Libre 3:

Diameter: 21mm (smaller than a quarter)
Thickness: 2.9mm (thinner than 2 pennies)
Weight: Ultra-light, barely noticeable
Profile: Nearly flush with skin
Clothing: Invisible under most garments

Dexcom G7:

Diameter: 31mm (between quarter and half-dollar)
Thickness: 5.5mm (about 3 pennies)
Weight: Light but more noticeable
Profile: Sits higher on skin
Clothing: May show slight bump

Smartphone Compatibility

In our FreeStyle Libre 3 vs Dexcom G7 comparison, phone requirements are crucial:

FreeStyle Libre 3 Requirements:

iPhone 8 or newer
Android 8.0 or newer
Must use smartphone (no separate reader)
Bluetooth always on
App: FreeStyle Libre 3

Dexcom G7 Requirements:

iPhone 12 or newer (more restrictive)
Android 10.0 or newer (more restrictive)
Optional receiver available ($400+)
Bluetooth always on
App: Dexcom G7

Compatibility Advantage: FreeStyle Libre 3 works with older phones, important for seniors not wanting to upgrade.

Alert Systems and Customization

Both systems in our FreeStyle Libre 3 vs Dexcom G7 comparison offer alerts, but with differences:

FreeStyle Libre 3 Alerts:

Customizable high/low thresholds
Optional predictive alerts
Quieter default sounds
Simple snooze options
Fewer alert types (simpler)

Dexcom G7 Alerts:

More alert options available
Urgent low glucose alarm (55 mg/dL)
Multiple sound choices
Complex scheduling options
Can be overwhelming initially

Senior Perspective: “I prefer Libre 3’s simpler alerts. Dexcom had too many options that confused me.” – Martha, 72

Data Accuracy Comparison

Both systems are highly accurate, but let’s look at the numbers:

Clinical Accuracy (MARD scores – lower is better):

FreeStyle Libre 3: 7.9%
Dexcom G7: 8.2%

Real-World Performance:

Both accurate enough for insulin dosing
Libre 3 slightly better in low glucose ranges
G7 slightly better in rapid change situations
Both significantly better than older models

Warm-Up Period

The time from application to first reading:

FreeStyle Libre 3: 60 minutes

Use this time to familiarize with app
No rush to see first reading
Can do normal activities

Dexcom G7: 30 minutes

Faster start appeals to some
Less time to prepare mentally
May feel rushed for new users

Medicare Coverage: No Favorites

Great news in our FreeStyle Libre 3 vs Dexcom G7 analysis: Medicare covers both equally!

Coverage Requirements (Same for Both):

Type 1 or Type 2 diabetes diagnosis
Insulin use OR history of problematic hypoglycemia
Prescription from healthcare provider
Use Medicare-approved DME supplier
Meet testing frequency requirements

Your Costs with Medicare:

Part B Coverage: 80% of approved amount
With Supplement: Usually 100% covered
Sensors per Month: 2-3 depending on wear time
No Preference: Medicare doesn’t favor either brand

Real Cost Comparison

Beyond Medicare, here’s what you might pay:

FreeStyle Libre 3 Costs:

Sensors: ~$75 each without insurance
Reader: None needed (use smartphone)
App: Free
Total Monthly: ~$150 without insurance

Dexcom G7 Costs:

Sensors: ~$100 each without insurance
Receiver: $400+ (optional but many seniors prefer)
App: Free
Total Monthly: ~$200+ without insurance

With Medicare + Supplement: Both typically $0 out-of-pocket

Setup and Learning Curve

For seniors new to CGM technology:

FreeStyle Libre 3 Setup:

Day 1 Experience:

Download app (5 minutes)
Create account (10 minutes)
Apply sensor (2 minutes)
Wait 60 minutes
Start using immediately

Learning Curve: 2-3 days to feel comfortable

Dexcom G7 Setup:

Day 1 Experience:

Download app or set up receiver (10-15 minutes)
Create account (10 minutes)
Apply sensor (3-5 minutes)
Pair devices (5 minutes)
Wait 30 minutes
Calibration considerations

Learning Curve: 4-7 days to feel comfortable

Customer Support Comparison

When you need help, here’s what to expect:

FreeStyle Libre Support:

Phone: 1-855-632-8658
Hours: 24/7 availability
Wait Times: Usually under 10 minutes
Senior-Friendly: Yes, patient representatives
Languages: Multiple options

Dexcom Support:

Phone: 1-888-738-3646
Hours: 24/7 availability
Wait Times: Can be 20-30 minutes
Senior-Friendly: Yes, but recall has increased volume
Languages: English and Spanish

Real Senior Experiences

Here’s what actual users say about FreeStyle Libre 3 vs Dexcom G7:

FreeStyle Libre 3 Users:

Robert, 74: “The smaller size sold me. I forget I’m wearing it, and setup was so simple my grandson was impressed I did it myself.”

Helen, 69: “I switched from Dexcom after the recall news. Libre 3 has been more reliable and easier to use.”

Dexcom G7 Users:

James, 71: “I like the shorter warm-up time and the receiver option since I don’t always have my phone.”

Dorothy, 66: “More alerts than I need, but my daughter likes monitoring my levels remotely.”

Making Your Decision: Which is Right for You?

After this detailed FreeStyle Libre 3 vs Dexcom G7 comparison, here’s our guidance:

Choose FreeStyle Libre 3 If You:

✓ Want the smallest, most discreet sensor
✓ Have arthritis or dexterity issues
✓ Prefer simpler technology
✓ Have an older smartphone
✓ Are concerned about device recalls
✓ Want proven reliability
✓ Prefer one-piece application

Choose Dexcom G7 If You:

✓ Want the option of a dedicated receiver
✓ Need extensive alert customization
✓ Prefer shorter warm-up time
✓ Have family wanting detailed remote monitoring
✓ Are comfortable with more complex technology
✓ Have a newer smartphone
✓ Want more data analysis options

Special Considerations for 2025

Technology Updates:

Both companies release regular app updates
Features continue to improve
Integration with other devices expanding

Supply Chain Reality:

FreeStyle Libre: Consistent availability
Dexcom: Some delays reported post-recall
Always order replacements early

Future Developments:

Both working on extended wear sensors
Improved accuracy coming
Better Medicare coverage expected

The Bottom Line

In our comprehensive FreeStyle Libre 3 vs Dexcom G7 comparison, both are excellent CGM systems that can transform your diabetes management. The recent Dexcom recall, while concerning, shouldn’t eliminate G7 from consideration – but it does highlight the importance of choosing a reliable supplier and staying informed about your medical devices.

For most seniors, especially those new to CGM technology or with dexterity challenges, the FreeStyle Libre 3 offers the best combination of simplicity, reliability, and comfort. However, if you need extensive customization or prefer having a dedicated receiver option, the Dexcom G7 remains a solid choice despite the company’s recent challenges.

Your Next Steps

Discuss with your doctor which system aligns with your needs
Check your Medicare coverage to confirm benefits
Consider your comfort with smartphone technology
Think about your lifestyle and which features matter most
Remember: You can switch systems if your first choice doesn’t work out

Safety First

Regardless of which CGM you choose:

Register your device with the manufacturer
Stay informed about recalls and safety notices
Report any unusual device behavior immediately
Keep customer support numbers handy
Don’t hesitate to seek help

Need Help with Medicare CGM Coverage?

Our specialists can help you navigate Medicare requirements and get the supplies you need – whether you choose FreeStyle Libre 3 or Dexcom G7.

Call Now: 727-831-3729