FreeStyle Libre 2 vs FreeStyle Libre 3

Managing your diabetes can be tricky, and keeping an eye on your blood sugar levels can be difficult without the right equipment. Having a blood glucose monitor can be a handy way to help with your diabetes management. They are compatible with certain mobile phones and are simple to use.

Diabetes monitoring is important for anyone who has diabetes. There are blood sugar monitors available to assist you, including the new FreeStyle Libre 3. Deciding which device to use can seem confusing, but don’t worry, we can help! 

This guide will offer you a comparison between the FreeStyle Libre 2 and 3 to help you understand more about what the devices can offer…

What is the FreeStyle Libre 2?

The Freestyle Libre 2 is a system designed to provide you with continuous glucose monitoring (CGM). It provides you with 14 days of accurate results and is suitable for adults and children with both type 1 and type 2 diabetes. 

It is a painless system with real-time alarms, alerting you if your blood glucose levels are too high or too low. 

What is the FreeStyle Libre 3?

The FreeStyle Libre 3 is the latest continuous glucose monitoring system. Just like the Libre 2, it also provides you with real-time glucose monitoring, allowing you to check your blood sugar when it is needed. 

It is the smallest and most discreet device from FreeStyle so far. It measures your glucose levels throughout the day and night.

Why is it important to know blood glucose levels when you have diabetes? 

When you have diabetes, knowing your blood glucose levels helps you to manage your condition effectively. Being aware of your blood sugar levels can also give you and your healthcare team an idea of how your diabetes medication is working.

Keeping a close eye on your blood glucose also allows you to see the effects that specific foods and exercises have on your body. You will be able to adjust your diet and exercise regime accordingly, if you find that your levels are not quite right.

The other benefits of blood sugar monitors

Blood sugar monitors are also a good way to monitor your trends over a period of time. By providing you with more information, you will be able to have a sense of control over your overall health.

You can also avoid the finger prick by using a monitor. This makes it a pain-free experience for anyone with diabetes. 


A blood sugar monitor can also help you to detect prediabetes. This can be helpful for those who are at a higher risk of developing diabetes. [1]

It is important to know that a CGM works slightly differently to flash glucose monitors. Some CGM monitors can send information to an insulin pump, which is important if you are using a closed-loop system.

What type of diabetes does this work for?

CGM devices can be used for anyone with type 1 diabetes and type 2. In patients with type 2 diabetes, the device can be used to improve glycemic control and reduce hypoglycemia. [2]

Your doctor will be able to talk to you about whether the Freestyle Libre devices are suitable for you.

What are the benefits of the Freestyle Libre 2

The Freestyle Libre 2 sends readings to your smartphone. It updates the reading every 60 seconds and can store up to 8 hours of glucose readings in 15-minute intervals.

The device is designed to be water resistant and can be worn for as long as 14 days consecutively. You can even keep the device on during activities like showering, exercising and swimming.

The device is painless to apply and is easy to wear. You can connect it to a smart insulin pen, your caregiver’s device and your own device.

What makes the Freestyle Libre 3 better than the FreeStyle Libre 2?

The FreeStyle Libre 3 system is much smaller and more discreet than the FreeStyle Libre 2. It is roughly the size of a pound coin. You will be able to wear the device on your upper arm without worrying too much about its visibility. 

The system will also provide you with the most accurate readings, making it the perfect choice. 

The device can be used alongside the FreeStyle Libre 3 app, however, it is only compatible with iOS and Android devices.

How do blood glucose monitors improve the lives of people with diabetes?

Seeing your blood glucose levels with real-time results can help you make more informed decisions about your health. You will be able to make better decisions around the food and drinks you consume, alongside the exercise you do and the medications you are taking.

They can help you keep your blood sugar levels in the correct range, preventing other health issues that can be caused by diabetes.

How much do they cost?

The price of a CGM is usually between £40-£70. Depending on the device, you might also need to buy a transmitter and reader. A starter pack is also available to buy for most devices which contains everything that you need and is usually around £200.

You might qualify for a free device on the NHS. You should check the guidelines here to see if you meet the criteria. 

The cost of the FreeStyle Libre 2 Sensor with us at Chemist4U is £53.59 and the FreeStyle Libre 3 Sensor is priced at £62.99.

Where can I buy them?

The FreeStyle Libre devices are available for purchase here at Chemist4U. We offer bundles on both the 2 and 3 or you can just purchase the sensor.

How often will I need to replace the Libre 3 compared to the Libre 2?

Both of the devices will need replacing after 14 days of use. After wearing the device for 14 days it will automatically stop working. 

You must also replace your sensor if you notice any pain or discomfort in the area it has been applied to.

Does the FreeStyle Libre 3 have an app?

The FreeStyle Libre 3 has an app, making it even more simple for you to monitor your diabetes and keep it under control. 

The app is simple to use and can assist you with your blood glucose readings.

What does the app do?

The app allows users to monitor their glucose levels and receive alarms directly to their mobile device.

The user-friendly app not only allows for constant glucose tracking, but it also provides you with a trend analysis, stores your glucose data for up to 90 days and provides you with personalised reminders.

Do I have to pay for the app?

The app is free to download and free to use. All you need is a compatible device to get yourself going. It is simple and easy to use, however, you will require registration with LibreView before you can get started.



When it comes to effective diabetes management, having a blood glucose monitor can be extremely helpful. You will be able to keep on top of your readings by using devices such as the FreeStyle Libre 2 and 3.

Managing your diabetes correctly can help to prevent other health problems that can be caused by diabetes. It can also help to improve the quality of your life!



Olivia Malone - Medical Content Writer
James O'Loan - CEO & Superintendent Pharmacist
James O'Loan , CEO & Superintendent Pharmacist on 07 February 2024
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