Let’s get connected.

The essentials for bringing your Libre readings into Apple Health, and keeping them close throughout your day.

Install the public beta

Open the TestFlight invitation on your iPhone. Follow the prompts to install Apple’s TestFlight app, accept the invitation, and install Glucose Connect. You can share feedback through TestFlight as you explore the beta.

Before you start

• An iPhone running iOS 18 or later and a Libre 3 or Libre 3+ sensor.
• The official Libre app installed, connected to your sensor, and running on the same iPhone. It uploads the readings Glucose Connect uses.
• A LibreLinkUp follower account receiving your readings. This is a separate login from your Libre or LibreView account.
• Internet access and Bluetooth enabled. Apple Watch is optional; the companion app requires watchOS 11 or later.

Three steps to connect

1. Set up sharing in the official Libre app. Invite your LibreLinkUp follower account and accept the invitation in LibreLinkUp. Confirm that your readings appear there before continuing. Keep the official Libre app running.
2. Open Glucose Connect and connect LibreLinkUp. Read and acknowledge the app’s disclaimer, then sign in with the follower account. The app checks your credentials. Follow the sensor-connection prompts and allow Bluetooth access.
3. Allow Apple Health access. Grant permission to write Blood Glucose readings. You can also allow carbohydrate read access to show meal timing on your charts. You can revisit the connection and Health permissions in Settings if you skip these steps initially.

Glucose Connect uses Bluetooth activity from the sensor to prompt a fetch from LibreLinkUp. The glucose values themselves come from LibreLinkUp, so internet access and the official Libre app are still needed.

Get to know your routine

On the main glucose screen, choose the ~ button to open Routine. It brings readings from the same time of day together across your selected window, creating one 24-hour graph. The shaded bands show how your readings are distributed, so you can see both typical patterns and variation.

Choose 7, 14, 30, or 90 days under Settings → Routine. The default is 14 days. For a full 90-day lookback, import older readings from Apple Health under Settings → History. If less history is available, Routine uses the readings it has and shows how many days are included. You’ll need at least a couple of days of readings for the view to become useful. This is a view of past readings, not a forecast.

See meal timing alongside your readings

Allow Glucose Connect to read Dietary Carbohydrates in Apple Health. If you already connected Health before this option was added, tap Settings → Meals → Turn on. Carbs must be logged in Apple Health by you or another app; Glucose Connect does not log meals.

A strip of ticks appears below the D and ~ charts when carbs have been logged in the last 90 days. On D, it shows carbs for the day on screen. On Routine, it combines meal timing across the selected window: taller ticks mean more carbs, or carbs logged more often. The strip follows the period you select with Rewind. If no recent carbs are available, it stays hidden; Settings may show No carbs.

Make sense of the rings

The outer ring shows time spent low, in range, and high for the period on the chart. Tap a segment or its label to see its share. Choose the inner ring’s metric under Settings → Inner ring: Glycemia Risk Index (GRI), Glucose Management Indicator (GMI), or Coefficient of Variation (CV). Tap its number for an explanation. The inner ring covers a 14-day window.

Explore and share a chart

Choose D, W, or M for a day, week, or month. Day bars span the lowest to highest reading in each half hour; week and month bars span each day’s range. Drag across a chart to inspect a point. Tap the large chart readout to cycle between range, average, and median. On Routine, Typical takes the place of range and shows the middle half of readings.

Use the arrows to move one period at a time, or one day at a time on Routine. Drag the Rewind pill along its track to explore your available history. The share icon at the chart’s top right creates an image you can save or send.

A little help finding your way

The guided tour introduces the readings, rings, charts, and settings after onboarding. Skip it at any time or replay it from Settings → App tour. If you don’t have enough readings yet, the tour uses sample data.

Make it feel like yours

Open Settings → Appearance to choose a glucose color scheme and accent color. Match glucose color lets the accent follow your latest reading. Open App icon to browse icon collections, or Widget to preview backdrops and number styles. Supporter artwork is marked in the pickers.

Put a widget on your iPhone

Home Screen

Open Glucose Connect once, then touch and hold the Home Screen. Choose Edit → Add Widget and search for Glucose. Pick a size and add it. Choose Glucose Rings for your reading and rings, Glucose Art for a reading and graph over your chosen backdrop, Big Number for a larger reading, or Glucose for the standard reading and graph layouts. Each Home Screen widget shows the reading age. Choose the art widget’s backdrop and number style under Settings → Appearance → Widget.

Lock Screen

Touch and hold your Lock Screen, choose Customize, and select the widget area above or below the clock. Add a Glucose widget in the layout you prefer.

Widgets show the age of their data. iOS decides when to refresh them; they may lag behind the app. A Lock Screen widget makes glucose information visible while your phone is locked. Remove it if you prefer to keep that information private.

Bring it to Apple Watch

The Watch companion is included with the iPhone app. In the iPhone’s Watch app, find Glucose Connect and install it or enable Show App on Apple Watch. Open it once on your Watch to start receiving snapshots from your iPhone.

To add a complication, touch and hold your watch face, choose Edit → Complications, select a slot, and choose Glucose Connect. Available layouts depend on the watch face. The Watch displays readings received from your phone; it does not connect directly to LibreLinkUp.

When something looks out of date

Know the limits

Glucose Connect is an independent hobby project. It is not a medical device, has no alarms, and must not be used for treatment decisions. Readings can be delayed, incorrect, or missing. Keep using your established monitoring and alarm tools.

For details about how information is handled, read Privacy.