Dexcom G7 vs. FreeStyle Libre 3 Plus: Which CGM Is Right for Your Diabetes Care?

Sometimes, managing diabetes can feel like a full-time job, juggling meals, meds, doctor visits, and everything else that comes with it. That’s where a continuous glucose monitor (CGM) steps in, making it a lot easier to keep everything in check without the hassle of fingersticks. If you’re trying to decide between the Dexcom G7 and the FreeStyle Libre 3 Plus, or want to learn more about each of them, you’re not alone. Both of these devices are top-rated, FDA-approved CGMs that provide real-time glucose tracking, smartphone compatibility, and valuable health insights.

This guide breaks down the key differences between Dexcom and FreeStyle Libre, so you can make a choice that fits your needs and lifestyle perfectly.

What Is a CGM and Why Use One?

Before we dive into the specifics of different available CGMs, let’s quickly cover what these devices actually are and why they’re beneficial.

A continuous glucose monitor (CGM) is a small device you wear that tracks your glucose levels 24/7. It helps folks with type 1, type 2, or gestational diabetes because it can:

• Catch high or low readings before they become dangerous
• Track trends and make smarter treatment decisions
• Cut down on (or eliminate) routine finger pricks
• Share your data with loved ones or healthcare providers in real time if you so choose

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Product Snapshot: Dexcom G7

The Dexcom G7 CGM stands out for its speed, accuracy, and impressive alert features (like customizable alerts for high and low glucose levels). It’s a top pick for users who rely on insulin pumps or are looking for more detailed insights into their glucose trends. In fact, it’s considered one of the most accurate CGMs on the market!

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Key Features:

• You can wear the sensor for up to 10 days, plus there’s a 12-hour grace period for a smooth swap
• It warms up in just 30 minutes, so you can dive right into the actionable data
• With an impressive accuracy rate of ~8.2% MARD, it’s super reliable even when your glucose levels fluctuate quickly (MARD stands for Mean Absolute Relative Difference, a key measure of CGM accuracy)
• You can set customizable alerts for high and low levels, including urgent low warnings that can notify you up to 20 minutes in advance
• It’s fully waterproofand able to handle depths of up to 8 feet for 24 hours, perfect for swimming!
• You can check your readings on your Apple Watch without needing to pull out your phone
• It works seamlessly with insulin pumps from Tandem and Omnipod
• The new app features include 7-day GMI estimates, smart food logs, and A1C trends to help you keep track of your progress over time

Best For:

• People with type 1 diabetes
• Anyone relying on insulin pumps
• Users who want early warning alerts and precision monitoring
• Athletes or active individuals who need something durable and waterproof

Learn More About the Dexcom G7

Product Snapshot: FreeStyle Libre 3 Plus

The FreeStyle Libre 3 Plus system by Abbott is simple, reliable, and discreet. It’s designed for those who appreciate a simple setup that just works. Users love it for its minimal changes and the ease it brings to glucose tracking. At CityDME, we carry the FreeStyle Libre 3 Plus Complete Kit, which has everything you need: the sensor, reader, app access, and support materials. You can also get the reader or sensor kits separately.

Key Features:

• Up to 15-day wear time per sensor, meaning fewer replacements each month
• Gentle 1-hour warm-up before first readings, it’s quick and painless to get started
• Get readings every minute, sent straight to your phone or the included reader
• Safe for ages 2 and up and has been cleared for use during pregnancy
• Water-resistant for up to 30 minutes at a depth of 3 feet, so you can keep it on while showering or swimming
• It’s compatible with automated insulin delivery (AID) systems
• Features optional alarms and the ability to share data through the LibreView and LibreLinkUp apps

Best For:

• People with type 2 diabetes
• Families or children who need a more streamlined system
• Users who prefer fewer changes and less complexity

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At-a-Glance Comparison of the Dexcom G7 and FreeStyle Libre 3 Plus

How to Decide: Which One Is Right for You?

Choose Dexcom G7 if you want:

• Real-time, customizable glucose alerts
• Faster sensor warm-up
• Compatibility with insulin pumps
• A waterproof sensor for an active lifestyle
• Greater insight with trend logs and smart app features

Choose FreeStyle Libre 3 Plus if you want:

• Longer wear time between sensor changes
• A slimmer, lower-profile design
• Simpler data sharing with providers or family
• Fewer features and a more hands-off approach
• An ideal starter CGM for families or type 2 users

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What to Ask Your Doctor When Choosing a CGM

If you have an upcoming doctor’s appointment, it’s smart to go in prepared with questions about CGMs. Here are a few you might consider asking:

• Am I a good candidate for a continuous glucose monitor?
• Will using a CGM help me manage my blood sugar better or help prevent highs and lows?
• Which system do you recommend based on my lifestyle or health goals?
• Is one CGM more compatible with my insulin plan or other devices I use?
• How often will I need to change sensors?
• Do I need to log food, activity, or insulin in the app?
• Will my insurance cover a CGM, and if not, are there other options?

These questions can really help you and your healthcare provider make a well-informed and confident decision together.

Tips for New CGM Users

If this is your first time using a CGM, consider some of these tips:

• No routine fingersticks are required for most users, but it’s good to keep a backup meter handy just in case your sensor acts up or gives you unexpected readings
• Make sure to share your CGM data with your healthcare team using apps like LibreView or Dexcom Clarity
• Insurance coverage often varies — CityDME can help verify insurance eligibility and guide you through the paperwork
• Check device compatibility, as not all smartphones or smartwatches work with every CGM. Review the manufacturer’s apps first

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Frequently Asked Questions (FAQ) About Dexcom and FreeStyle Libre CGMs

Do CGMs completely replace fingersticks?

For most users, absolutely! Both the Dexcom G7 and FreeStyle Libre 3 Plus have received FDA clearance to be used without fingersticks. That said, if your symptoms don’t quite match the readings or if you’re experiencing rapid changes in glucose, you might still want to check manually.

Which CGM is more accurate?

Both systems are impressively accurate, but the Dexcom G7 takes the lead with a mean absolute relative difference (MARD) of around 8.2%. This means it does a great job of staying accurate even when your glucose levels are changing quickly.

Can children use these devices?

Yes, they can! Both CGMs are approved for kids aged 2 and older. Parents and caregivers often use them for remote monitoring, making it easier to keep an eye on their little ones.

Are CGMs waterproof?

Yes! The Dexcom G7 is waterproof for up to 24 hours at a depth of 8 feet, while the FreeStyle Libre 3 Plus is water-resistant for 30 minutes at 3 feet. You can wear both while showering, swimming, or working out.

Will insurance cover a CGM?

In many cases, yes, especially for those using insulin. Coverage can vary based on your provider and plan, but CityDME is here to help you check your eligibility and take care of the paperwork.

What if I’m pregnant or planning to become pregnant?

Both Dexcom and FreeStyle Libre are approved for use during pregnancy. However, it's always a smart move to chat with your OB/GYN or endocrinologist to figure out the best care plan for you.

Still Deciding Which CGM Is Right for You?

Choosing the right CGM isn’t just about the specs; it’s about finding the right fit for your lifestyle, diabetes plan, and comfort level.

Still unsure? Consult your healthcare provider, and if you’d like help finding the right CGM, CityDME provides prescription support, insurance verification, and fast shipping options for both systems.

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