A smart watch on someones wrist, showing blood glucose readings from the Libre 2 via Diabox

Connecting The Libre 2 To A Smart Watch

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I’ve been used the Libre 1 since it was released in 2014, so when I found out the Libre 2 was being rolled out on prescription in the UK I have been sitting patiently (mostly) until I could get my hands on it. For the last 18 months I have used the MiaoMiao to turn the Libre 1 into a CGM with alarms and, while I was glad to have it available, I couldn’t wait to ditch the extra device and have alarms built in to the Libre 2.

However, I hadn’t realised how reliant I had become on being able to see my blood sugars on my watch. With 2 young kids to chase I really appreciate the ability to glance down and know what my blood sugars are at any given time. At first I didn’t think it was going to be possible with the Libre 2 as I was no longer using the MiaoMiao, but as always seems to be the case with diabetes tech – where there’s a will theres a way!

How To See Libre 2 Readings On A Smart Watch

Accessing your blood glucose readings on a smart watch is actually really simple, and you don’t need any extra devices making it totally FREE. While some people may not see the need to have readings on show 24/7 I know many that really like the idea. During exercise I can glance down at my watch to see what is happening instead of stopping to scan or waiting for an alarm. This lets me deal with a potential issue before it even happens, pre-empting situations and staying 1 step ahead of major blood sugar fluctuations.

DiaBox uses it’s own algorithm to calculate blood glucose readings so it is likely that it will read slight different to your Libre 2. In both cases there may be a delay between what the readings say and what a finger prick says.

Step 1: Install DiaBox

DiaBox is a completely free app, and it is the simplest way of having your blood glucose show on your smart watch. It is not available in the app store, only through Test Flight. You can download Test Flight here, and then follow the instructions to install DiaBox.

Step 2: Connect Your Libre 2

Once you have installed DiaBox go to the settings. Under “data collection” change it from the default follower to master. When prompted to allow DiaBox to access bluetooth click yes.

The settings screen on the DiaBox app. A red circle

Click “Add Bubble” (this is because DiaBox was originally used for the Bubble device) and then scan your sensor. Make sure both boxes are ticked, and when it asks if you want to forget bubble click ok. This doesn’t always work properly the first time, you may need to retry a few times. Each time you will need to double check the boxes are ticked. You are then connected to Diabox.

Related Post: Managing Type 1 Diabetes On Your Wedding Day

Step 3: Connect To Your Smart Watch

Each smart watch will have their own individual ways for adding an app to the watch face. I can only speak about an Apple Watch from experience.

For Apple Watch users, you will now find DiaBox as a complication on the watch app. Use a modular watch face option and place DiaBox wherever you want it. And you’re done!

A smart watch on someones wrist, showing blood glucose readings
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What To Do If The Libre 2 Keeps Losing Connection

Some people find that they can use DiaBox for continuous readings on their smart watch, while still using the Libre 2 for their alarms. However, that is not always the case. You may find that both DiaBox and the Libre 2 lose bluetooth connection repeatedly. To fix this you can turn off the Libre 2 alarms, which will prevent it from using your bluetooth connection continually. You can turn on the DiaBox alarms in order to receive blood glucose alerts.

Want To Know More About The Libre?

Over the last few years I have had a lot of experience with using Libre. I’ve written about it numerous times, so if you want to find out more about my personal experiences then check out one of these:

12 thoughts on “Connecting The Libre 2 To A Smart Watch”

  1. Paul Crockford-Taylor

    Hi – this article was really useful. However, should the DiaBox make contact with the Libre. Periodically? Or do you have to manual scan each time? If the former then this does not seem to be happening. I have turned off the alarms on the Libre 2. App.

    1. Hi! No you shouldn’t need to scan every time, the data should update every few minutes via your bluetooth. Are you keeping your phone near by?

      Often it’s just as simple as restarting your phone and then it works fine again. I hope you’ve got it fixed!

  2. Hi, thanks for the guide. Do you need to start a new sensor with diabox or can you start using diabox after a sensor has already been started with the app? Thanks

  3. Hi. Thanks for the guide, it helped me a lot!
    Do you know which apple watch version you need for Diabox to show on the watch?

  4. Hi, can I use diabox on an android phone but then connect to an apple watch? Or do the phone and watch have to be the same (android/apple)?

  5. Would you know if it is possible to pair the miaomiao with diabox. I’ve been using the xDrip but would like to move to diabox to use some other features. Thanks a lot in advance.

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