Comments on FreeStyle Libre Reader device versus the LibreLink app

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Marike

Hi, very useful information, thanks. I do have one question. You say “ You notably can’t use the Reader if you’ve activated the Sensor using the app.” But later say you use the read during sleep and app during the day.

Just to confirm, can you use the reader and phone app at the same time or is it one sensor per reader/app and I would have to wait 14 days for a new sensor if I wanted to change device.

Thanks for any help and I hope what I said make sense

> Just to confirm, can you use the reader and phone app at the same time

Yes, but you must activate the sensor using the Reader first and then the phone app. You’ll only get alerts on the first device you activate, though. So, you can read the data with the phone app and read and receive alerts on the Reader.

I’ve stopped using the Reader and only use the app nowadays. I prefer receiving alerts on my phone. It took a while to trust my phone to do it properly, though. You need to carefully adjust notification settings to bypass Do Not Disturb mode and disable all background limitations/battery optimization for the app. Otherwise the alerts might not work.

> […] would [I] have to wait 14 days for a new sensor if I wanted to change device.

A sensor can be activated on up to four devices, but with the same limitation as above. Only the first device will receive alerts, but you can use multiple apps to read the sensor.

Bruno

Just got a phone with NFC capability...so i run to the APP to see how it would work.

The thing is. The values between APP and Reader are different, like sometimes around 20 points. This makes no sense because the value is stored in the sensor not in reader or the phone...

Have you, or did you, experience anything similar? I will start comparing the values with the ones taken from blood to see who is the closest but in the meanwhile, do you know?

> The values between APP and Reader are different, like sometimes around 20 points. This makes no sense because the value is stored in the sensor not in reader or the phone...

The Sensor only stores raw sensor data and not glucose levels. It’s not in your bloodstream, just your interstitial fluids. The app or Reader interprets the data into a glucose reading. so, the calculations on your phone is probably using a newer algorithm than your Reader. The app gets updates every now and than and improve over time. The Reader doesn’t.

However, if you’re seeing large differences then you should control with a regular blood test. That’ll help you confirm that your Sensor is working properly.

Martin Biermann

There is one killer argument for me to use the Libre2 App on my phone: It will send discrete vibration alarms to my Wear OS smartwatch. Enough to wake me, but not my wife. Still, setting up reliable alarms 24/7 is quite challenging depending on your phone and your watch. Even though I prefer Sony, the combination of a Samsung S21 and the Galaxy Watch 4 works best.

Anonymous

Does the app will show sugar level for every 15 minutes even when I sleep?

> […] setting up reliable alarms 24/7 is quite challenging depending on your phone and your watch.

The new Libre 3 sensor has a few officially supported Android smartwatches. They all rely on notification synchronizationy but they should at least be tested by Abbott and found to be reliable.

> Does the app will show sugar level for every 15 minutes even when I sleep?

The app (and reader) won’t show readings unless you scan it. However, it will trigger an alarm when your glucose levels go below or above your target range (as long as it is within Bluetooth range). So, it will alert and hopefully wake you if it drops too low or high.