Freestyle Libre 3

Freestyle Libre 3 (FSL3) requires a unique setup to receive BG values in to AAPS. The below is one method for achieving this using the separate app Juggluco. This method uses Juggluco to receive raw, 1-minute interval data from the sensor which is then passed to xDrip+ to be smoothed into 5-minute interval data to be passed to AAPS. While it is possible to pass data directly from Juggluco to AAPS at 1-minute intervals, this would likely result in noisy data and additional battery drain.

New sensors can be started either with the Libre 3 App or directly in Juggluco. The guide below indicates the process for starting a sensor with the Juggluco app. For more information on directly starting a sensor within the Libre 3 app please refer to “further help” below. If the sensor has been started with a Libreview account logged in, it is also possible to switch between Juggluco and the Libre 3 app as receiver.

Juggluco can also pass data to LibreView for sharing with health care providers when the sensor is started with the Libre 3 app.

Within xDrip+ the sensor can be calibrated in the range of -40 mg/dl to +20 mg/dl (-2.2 mmol/l to +1.1 mmol/l) to compensate for differences between a manual meter reading and the sensor readings.

Current limitations

  • If you have a rooted system and want to use the Libre 3 app, you need to hide it. You can find instructions here: Link. (To find out if the smartphone is rooted, there are several apps, one of them is e.g.

Step 1: Setup Juggluco

Download and install the Juggluco app from here.

Now let’s open the app. You will be greeted with this screen below. Just click on the „Without Sensor“ button.

Juggluco welcome screen

After that we get a short introduction text. Click on „OK“.

Juggluco installation screen

Ok, let’s set up Juggluco! The app itself doesn’t have the best interface, but it is very useful. To open the settings, click anywhere on the screen in the top left corner. Now you should see the following menu. Select „Settings.“

Juggluco settings menu

In the settings you can configure the data connection to xDrip. Click on „Patched Libre Broadcast“ and press „OK“.

Juggluco settings

Well done!

Necessary settings for a successful sensor start:

  • NFC enabled / BT enabled

  • Memory and location permission enabled

  • location service enabled

  • automatic time and time zone setting

Please note that location service is a central setting. It is not the location authorization of the app, which must also be set!

Now start the Libre3 sensor with the Juggluco app by simply scanning the sensor. Make sure that all settings are correct.

Step 2 (optional): Setup Libreview

You can use a sensor that was already used with the original Libre3 app if you use the same LibreView account name. Press „Start new sensor“ and scan the sensor. If you want to return to the Juggluco app, stop the Libre3 app and scan the sensor with the Juggluco app open.

You can also, for example, share your data with your doctor or print the reports from Libreview before your visit. The graphs and blood glucose reports in Libreview are usually better than those from xDrip or Juggluco.

  1. Navigate to settings in Juggluco

  2. Choose „Libreview


  1. Enter the data of your Libreview account (if you don’t have one yet, create one in advance)

  2. Tap „Get Account ID“ and wait until the Libre-ID gets visible (random number below the password input field)

  3. Done!

Step 3: Setup xDrip

The blood glucose values are received by the xDrip+ app on the smartphone.

  • If not already set up, download the xDrip+ app and install one of the latest nightly builds from here.

  • In xDrip+ select „Libre2 (patched app)“ as data source.

  • Disable battery optimization and allow background activity for the xDrip+ app.

  • If necessary, enter „BgReading:d,xdrip libre_receiver:v“ under Less Common Settings->Extra Logging Settings->Extra tags for logging. This will log additional error messages for troubleshooting.

  • In xDrip+ go to Settings -> Interapp Compatibility -> Transfer data locally and select ON.

  • In xDrip+, go to Settings -> Interapp Compatibility -> Accept Treatments and select OFF.

  • To allow AAPS to receive blood glucose values (from version 2.5.x) from xDrip+, please enable Settings -> Interapp Settings -> Identify Receiver „info.nightscout.androidaps“.

  • If you want to use AndroidAPS for calibration, go to Settings -> Interapp compatibility -> Accept calibrations in xDrip+ and select ON. It’s also best to check the options under Settings -> Less General Settings -> Check Advanced Calibration Settings.

Step 4: Start sensor within xDrip

xDrip+ aktyvuokite sensorių paspausdami „Start Sensor“ ir pasirinkdami „not today“. It is not necessary to hold the mobile phone onto the sensor. In fact „Start Sensor“ will not physically start any Libre 3 sensor or interact with them in any case. This is simply to indicate xDrip+ that a new sensor is delivering blood sugar levels. If available, enter two bloody measured values for the initial calibration. Now the blood glucose values should be displayed in xDrip+ every 5 minutes. Skipped values, e.g. because you were too far away from your phone, will not be backfilled.

Wait at least 15-20 minutes if there is still no data.

After a sensor change xDrip+ will automatically detect the new sensor and will delete all calibration data. You may check you bloody BG after activation and make a new initial calibration.

Step 5: Configure AndroidAPS

  • In AndroidAPS go to Config Builder -> BG Source and check „xDrip+“

  • If AndroidAPS does not receive BG values when phone is in airplane mode, use „Identify receiver“

As of now, when using Libre 3 as a BG source, the „Always enable SMB“ and „Enable SMB by Carbs“ options cannot be enabled in the SMB algorithm. The BG values from Libre 3 are not smooth enough to use safely.

Subsequent sensor changes

  1. Open Juggluco and note the serial number of the existing sensor

Libre serial number

  1. Now simply scan your new sensor with your phone’s NFC reader. Juggluco will display a notice if the process had been started successfully.

  2. When you are ready to deactivate the old sensor, then open the Juggluco menu by clicking anywhere in the empty space in the upper left hand corner of the screen.

  3. Select the exired sensor and tap „Terminate“

Terminate sensor

Note: When two sensors are active Juggluco will send the most recent value from either sensor to xDrip+. If the sensors are not calibrated and reading BG similarly, this may result in jumpy BG values being reported to xDrip+. If you terminate the wrong sensor, you can reactivate it by simply scanning the sensor.

Switch sensor between Libre 3 and Juggluco app

If the sensor has been started with a Libreview account logged in, it is also possible to switch between Juggluco and the Libre 3 app as receiver. This requires the following steps:

  1. Install the Libre 3 app from Google Playstore

  2. Set up the Libre 3 app with the Libreview account with which the sensor was activated.

  3. Force stop the Juggluco app in the Android settings.

  4. In the Libre 3 menu, click „Start Sensor“, select „Yes“, „Next“ and scan your sensor.

  5. After some minutes, the BG-Values should be visible within Libre 3 App.

In order to switch from the Libre 3 app to Juggluco, you need to force-stop Libre 3 app via Android settings and proceed with Step 1 & 2.

Patirtis ir gedimų šalinimas

Troubleshooting Libre3 -> Juggluco Connection

  • Make sure you are using a current version of the Juggluco app

  • Check your settings according to this guide

  • You may sometimes have to force stop the Libre 3 app and Juggluco and restart it.

  • Disable Bluetooth and enable it again

  • Wait some time or try to close Juggluco

  • Older versions of Juggluco (below 2.9.6) do not send subsequent data from the Libre3 sensor to connected devices (e.g. Juggluco on WearOS). You may need to click „Resend data“ in the patched Libre3 app (Juggluco menu).

Further help

Original instructions: jkaltes website

Additional Github repo: Github link