Dexcom VS FreeStyle Libre 1, 2 and 3 : Which Is Best For You? [Full Comparison]

I’ve had the pleasure of using both the Dexcom G6 and the FreeStyle Libre.

Not just at home, but also when travelling extensively around the world.

And since these are two super useful and popular devices in the diabetic community, I thought it would be a great idea to compare the two devices. 

I’m going to look at their functionality, their comfort, convenience and overall how they performed!

If you’re deciding between the Dexcom and FreeStyle Libre, then hopefully this post will help you make a better decision. 

So let’s get right too and compare the Dexcom G6 and FreeStyle Libre! 

What is the FreeStyle Libre?

The FreeStyle Libre Sensor is a flash monitoring system from Abbot that allows you to “scan” your blood sugar either via an app on your phone, or the FreeStyle Libre monitor. 

This means you instantly see your blood sugar levels, without needing to finger prick! 

I've found this particularly useful over the years when I've been on a night out drinking alcohol with diabetes and finger pricking isn't very convenient.

Your results will be placed on a graph alongside an arrow which will indicate whether your blood sugar is rising, falling, or seems like it’s in a stable position. 

This is achieved by wearing a small sensor on your arm. 

The FreeStyle Libre is typically the size of two stacked quarters in the USA or a 2 pence piece in the UK and they last up to 14 days! 

What is Dexcom?

The Dexcom is a smart system known as a “continuous glucose monitor” and it’s a device that continuously monitors your glucose levels and shows them either on your phone, your Dexcom receiver or even a smart watch, like the Apple Watch. This reduces the need for a glucose meter. 

It also allows you the ability to set alarms so that if your blood sugar is rising or falling, it will give you an alarm notifying you of this, meaning you can “fix” the issue before it happens. 

This is all achieved by wearing a small mintor on your arm, or stomach, or basically wherever it’s comfortable for you, and it typically lasts 10 days (however, there are little hacks to make them last longer).

There are different types of the Dexcom sensor, including the G5, G6 and G7. For the purposes of this review, I will be talking about the G6 as that’s what I used. 

CGM vs FGM

A CGM system is a continuous glucose monitor that continuously monitors your blood sugar, and that’s what the Dexcom is. 

Whereas, because the FreeStyle Libre doens’t have the ability to set alarms, it’s not considered a CGM, but rather a FGM, which is a flash glucose monitor. 

Abbott has already developed the FreeStyle Libre 2, which has the ability to set alarms, turning it into a CGM, but it’s not widely available yet, but I now have the chance to try it and you can check out my review here.

Looking for the best patches for your Dexcom sensor? Then check out my post.

Converting your FreeStyle Libre into a CGM

The latest versions of the Freestyle Libre (which is the 3rd) have the ability to set alarms, which gives it much more CGM capabilities, but if you can't get access to that particular version, then there are other options.

If you want to turn your FreeStyle Libre into a CGM, there are other alternatives. 

MiaoMiao

Firstly, you’ve got the MiaoMiao sensor.

This is a great device that you simply place on top of your FreeStyle Libre sensor and it provides you the ability to continuously conduct your blood glucose monitoring on a compatible app, and set alarms for the purposes of catching highs and lows. 

It’s a one-time purchase that can be reused as often as you wear your FreeStyle Libre. 

Blucon Nightrider

The other option is the Blucon Nightrider sensor, which is basically a similar device to the MiaoMiao, but they’re different sizes and some people prefer the app of the Blucon and the fact you can sync the data up to other members of the family. 

So, for example, mums and dads could monitor their child’s blood glucose from another room. 

Dexcom VS FreeStyle Libre: Which has the better design?

I love the design of both the FreeStyle Libre and the Dexcom, so it’s definitely hard to choose a winner out of the two from this perspective. 

With both devices, I use an app on my phone to scan or monitor my blood sugar.

I find this means there is one less extra device to carry around with me, and I always have my phone on me, so I’ll never forget it.

Both the Dexcom and FreeStyle Libre are small, but I would say that the Dexcom is more discreet. 

Although, the newest Freestyle Libre is also smaller than ever before.

The reason for this being where you can place it. 

Basically the FreeStyle Libre is “approved” for use on your arms, and it’s said it may not be as accurate on other parts of your body.

Whereas the Dexcom can be placed on your arms, stomach and legs. This means it’s easier to “hide” or “cover up” if that’s what you desire. 

They are both prone to getting stuck on doors, and I’ve almost ripped them both out because of this. 

But that’s why you invest in strong covers for them, which thankfully are widely available and accessible nowadays (check out these ones here).

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So, just in terms of discreetness, I’m going to let Dexcom win this round! 

Dexcom VS FreeStyle Libre: How easy are they to insert?

Both the FreeStyle Libre and Dexcom come with insertion devices which basically help you insert the sensor into your arm. 

When I first used both of them, I was scared, so I can’t say I enjoyed the process (but you do get used to it after the first time!).

I think the Dexcom looks a little more intimidating than the FreeStyle Libre. 

That being said, I never felt pain from either of them, so it’s a painless process from both devices. 

I would have to say the FreeStyle Libre wins this round, because the insertion device is a little smaller and less bulky. 

Dexcom VS FreeStyle Libre: How accurate are they?

In terms of accuracy, I thought both devices performed quite well. 

But as always, before you totally rely on your new device, it’s important to still continue to test your blood sugar, alongside the scanning or CGM nature. 

This means you can test the accurate nature of the device. And this is especially true if you are going to be taking insulin for meals. 

With both devices, I think that they’re not entirely accurate for the first 24 hours, but I simply put this down to the device adjusting. 

However, I would feel comfortable relying on them both for data to make decisions regarding my blood sugar levels. 

Both FreeStyle Libre & Dexcom win here because they are awesome at what they do.

Dexcom VS FreeStyle Libre: What are the bonus functions?

One of the big features that the Dexcom has over the FreeStyle Libre is the fact that with the Dexcom, you can set alarms and that you can turn into a full automated system with the tSLIM pump, thus making it a closed loop style system. This is something the Freestyle Libre cannot yet achieve.

These can be alarms that let you know if your blood sugar is rising or falling (before it actually happens), this allows you the ability to catch those sugars before they happen, thus helping to prevent rapid swings in blood sugar levels. 

The original Libre never allowed this but the FreeStyle Libre 2 and 3 does (I've got a new review on it). 

I actually found the Dexcom to be very overwhelming. I don’t know if it’s because my settings were wrong, but I just felt like I was constantly getting beeped at and alarmed at, and sometimes it wasn’t even right. 

So it quietly started to drive me a little bit crazy. BUT, this was in the first couple of weeks when I wasn’t used to it, and I hadn’t got the settings adjusted accurately enough yet. 

So what I will say is that if you find that when you’re using the Dexcom, that it’s a little too much, give it some time to let yourself adjust to it. 

Both the devices allow you to download data from your device which will allow you to see patterns of blood sugar. 

This data helps you make adjustments and they both can give you a predicted HBa1C level based on the data it’s taken from you.

Another cool thing about the Dexcom is that it can be synced up to a smart watch, and I think this is a really cool and useful way to see your data without any fuss or need to carry extra devices. 

Dexcom wins pretty hands down in terms of additional functions that allow you to customise your experience.

Freestyle Libre 2 VS Dexcom

As mentioned above, one of the brilliant bonus features of the Dexcom was the ability to add optional alarms.

Well, the Freestyle Libre 2 allows you to do the same thing! I've been using the Freestyle Libre 2 for a couple of months now and the alarm system is very very convenient and works very well, and the fact that I get the Freestyle Libre 2 on the NHS (I don't have to pay for it), means it's now a handsdown winner for me.

I've written a full guide on the Freestyle Libre 2 sensor, that you can check out for more information.

Freestyle Libre 3 VS Dexcom

Freestyle Libre 3 is the latest version from Abbot! It’s small, super discreet, and packs a punch! It's the closest to a full blown CGM available from the Freestyle Libre, and it does rival the Dexcom system, so if you can only afford one, or only get one or the other on funding, then these are some of the perks of the Freestyle Libre 3 and how it compares to Dexcom.

Here’s why it’s great:

• Tiny sensor: It’s about the size of two stacked pennies (5mm thick), so no one will notice it unless you tell them.
• Real-time glucose updates: Every minute, the Libre 3 sends your glucose reading straight to your smartphone via Bluetooth. You’re always in the know without even lifting a finger.
• No calibrations: No need for any fingerstick calibrations. It’s ready to go as soon as it’s on.
• Affordable: The Libre 3 is generally more budget-friendly than other CGMs, which is great for people who don’t want to break the bank just to know their blood sugar levels.
• 14 days of wear: You pop it on, and it’s good for two whole weeks before you even have to think about changing it. Low maintenance, high impact.

Dexcom

Now, let’s talk Dexcom....

Why Dexcom is great:

• Precision & Accuracy: Dexcom has a reputation for top-tier accuracy and real-time data. The newest model, Dexcom G7, is comparable in size to the Libre 3 but still rocks in terms of tech features.
• Alarms & Alerts: Dexcom is the best when it comes to customization. It gives you alarms if your blood sugar spikes too high or drops too low — and you can set the thresholds yourself.
• Integrations with Insulin Pumps: The Dexcom system integrates with various insulin pumps, which can automate insulin delivery based on your glucose levels. Libre 3 is catching up in this area but still has some ground to cover.
• Share feature: With Dexcom, you can let up to 10 people track your glucose levels in real-time (think parents, partners, or even your cat if they care that much). So, you’re never alone.
• 10-day wear: The Dexcom sensor lasts 10 days before you need to replace it. Not as long as Libre’s 14-day, but still solid.

So who is better?

• Size: Libre 3 wins this one, as it’s smaller and sleeker. Dexcom is slimming down with the G7, but Libre 3 still takes the crown here.
• Accuracy: Dexcom G7 has a slight edge in precision, especially for those who like extra bells and whistles, like super customizable alarms. Libre 3 is still highly accurate, but Dexcom fans swear by its reliability and I have to agree.
• Ease of Use: Both are easy to use, but Libre 3 is more of a "slap it on and forget it" deal, thanks to its 14-day wear and no calibration needs. Dexcom requires a little more attention but rewards you with extra features like sharing and pump integration.
• Cost: Libre 3 is slightly more budget friendly than the Dexcom, but this will be personal to you, depending on funding available and what your insurance will cover.

Dexcom VS FreeStyle Libre: Which lasts the longest?

The FreeStyle Libre lasts 14 days. In some areas, they still only have a 7 day sensor lifetime, but in general, the standard time of the Libre is 2 weeks. 

Once it’s done, there is no way to restart it (that I am aware of). 

The Dexcom lasts 10 days, however, lots of people have discovered ways to “restart” their Dexcom sensor, meaning it can last longer. 

I’ve never done this personally and there are some issues over whether it’s still as reliable and accurate, but I know of quite a few diabetics who successfully extend their Dexcom (it’s pretty darn expensive!) 

You can check out this article here about restarting a Dexcom G6 for some advice and insight. 

The FreeStyle Libre lasts for 4 days longer than the Dexcom, so wins here.

Dexcom VS FreeStyle Libre: How easy are they to remove? 

You’ll be happy to hear that when it comes to removal, both the Dexcom and the FreeStyle Libre are super easy. 

Let’s start off with Dexcom. To remove the sensor with the transmitter still attached, peel off the sensor pod like an adhesive bandage. This will pull out your sensor. If your sensor seems stuck, then I would dab some warm water around it.

After removing the sensor pod from your body, remove the transmitter from the sensor to keep for your next sensor.

The FreeStyle Libre is a similar process. You just remove the sensor by pulling it off. I suggest you grab and pull in one fast motion, so it doesn’t half stick. A bit like ripping off a bandaid. 

If it feels stuck, then ask someone else to remove it for you. 

When you remove either device, you might be left with some stickiness and markings of the device. You can easily remove this with some hot water and soap. 

No winner here as each has a similar process.

Dexcom VS FreeStyle Libre: How much do they cost?

In the UK: Both the Dexcom and the FreeStyle Libre can be funded via the NHS. Admittedly, it seems the FreeStyle Libre is easier to get than the Dexcom. 

In the USA: I know they’re both available under certain insurance policies, but since I’m not american I don’t know what those are. So if you do, then please do pop some information below in the comments section. 

In the UK, USA and worldwide the Dexcom and FreeStyle Libre sensor can be self-funded.

The costs in UK pounds are as follows.

Dexcom Costs: UK Pricing (Total with VAT )

Dexcom G7 Pricing (with VAT)

• Sensors: The Dexcom G7 sensors are designed to last 10 days each. A pack of three sensors (about 30 days' supply) costs around £159.
• Transmitters: The Dexcom G7 has an integrated sensor-transmitter combo, so no separate transmitter cost!

Dexcom G6 Pricing (with VAT)

For those still using or switching to the Dexcom G6, the costs are slightly different:

• Sensors: A Dexcom G6 sensor typically lasts 10 days. A pack of three sensors (30 days' supply) costs around £159.
• Transmitters: The transmitter lasts around 90 days, and it costs about £200.
• Receivers: If you don't use a smartphone, you can get a separate receiver for around £300.

Monthly Costs (Approximate)

For the Dexcom G6, the average monthly cost is around £159 for sensors, and every 3 months, you'll need to add about £200 for the transmitter, averaging about £226 per month overall. For the Dexcom G7, the monthly cost is around £159, as there’s no extra transmitter cost.

FreeStyle Libre costs around the world 

Here’s an overview of approximate costs for the FreeStyle Libre 2 and FreeStyle Libre 3 in different regions around the world, including VAT where applicable:

1. United Kingdom

• FreeStyle Libre 2 & Libre 3 Sensors:
  • Each sensor lasts 14 days and costs about £57.95 per sensor (or about £115.90 per month for two sensors).
  • Some individuals may get it free through the NHS if they meet certain criteria.

2. United States

• FreeStyle Libre 2 & Libre 3 Sensors:
  • The out-of-pocket cost for the sensor can range from $130–$160 per sensor, lasting 14 days, making it $260–$320 per month.
  • With insurance or Medicare, the cost can drop significantly to around $0–$75 per month, depending on the coverage plan.

3. Canada

• FreeStyle Libre 2 & Libre 3 Sensors:
  • Each sensor costs around CAD $89–$99 per sensor, totaling CAD $178–$198 per month.
  • Some provinces cover it through public health plans, or private insurance may reduce costs.

4. Australia

• FreeStyle Libre 2 & Libre 3 Sensors:
  • Each sensor is priced at about AUD $97.50 (for 14 days), making the monthly cost around AUD $195.
  • The government offers subsidies under the NDSS (National Diabetes Services Scheme) for eligible individuals, reducing costs significantly.

The final verdict

So there you have it! My guide on the Dexcom VS The FreeStyle Libre! Overall I think investing in either of these options is a great choice if you’ve just been diagnosed with diabetes and you’re looking for hopeful solutions to managing your blood sugars and diabetes care.

Each one can do wonders for your blood sugar management and helping you to avoid diabetes burnout.

At this stage in my life, I'm now using the Medtronic Guardian sensors because I have a closed loop system with my insulin pump. BUT if I had to go back to one these sensors, then I would use the Freestyle Libre 3.

I did recently test it, and it was accurate, but not as accurate as my own system, but it was strong and stayed on two weeks!

But if you can afford a closed loop system, then it's defo the way to go,if you can't then the Freestyle Libre system is a great option!

I hope you’ve found this most useful and helpful. Now over to you!

What do you think of the FreeStyle Libre or Dexcom? Do you have a clear favourite?

Or maybe you’re yet to try both. If so, which one are you leaning towards?

I would love to hear your thoughts, so drop a comment below ...

Don't forget you can get 10% off covers for your Freestyle Libre & Dexcom with NotJustAPatch with the code Cazzy10

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