The Dexcom G7 talks to Apple Watch in two distinct modes, and the difference matters more than the marketing suggests. Once you understand which mode you’re using, the setup is straightforward and the watch becomes one of the most useful pieces of diabetes tech you own.

The two modes

Mode 1: Companion mode (the default)

The sensor pairs to your iPhone. The iPhone’s G7 app pushes data to the Apple Watch app. If the phone is out of range, the watch loses data until the phone catches up.

This is the original mode and what most people end up using. It’s simple and reliable when your phone is on you.

Mode 2: Direct-to-Watch (standalone mode)

The sensor pairs directly to your Apple Watch over Bluetooth, bypassing the phone. You can leave your phone at home, go for a run, and the watch still receives glucose readings.

This is the mode most users actually want once they know it exists. It’s powerful but has some specifics worth knowing.

Before you start

Compatible Apple Watch model (Series 6 or later, see Dexcom’s published compatibility list it updates).
watchOS version that supports the current Dexcom G7 watch app.
Apple Watch paired and signed in to your iPhone.
A new Dexcom G7 sensor that hasn’t been started yet Direct-to-Watch is established at sensor start, not after.

Step 1 Install the watch app

On your iPhone, open the Watch app.
Scroll to Available Apps.
Find Dexcom G7 and tap Install. (If you have the G7 iPhone app installed, the watch app is usually available automatically.)
Wait for it to install on the watch small glanceable icon appears.

Step 2 Decide on the mode at sensor start

This is the moment that matters. When you start a brand new sensor, you choose at that point whether to enable Direct-to-Watch.

Open the Dexcom G7 app on your iPhone.
Begin the new-sensor flow. Scan the QR code on the sensor box as normal.
Insert the sensor.
During the pairing screens, you’ll be offered the option to also pair to Apple Watch. Accept it.
On your wrist, the Apple Watch will prompt to confirm the pairing.
The sensor pairs to both phone and watch simultaneously, and either can receive data independently.

If you don’t enable Direct-to-Watch at sensor start, you’re stuck in Companion mode for the life of that sensor. You can enable it for the next one.

Step 3 Set up the watch face complication

The watch app is most useful when your glucose is visible on your watch face without you having to open anything.

Long-press your watch face.
Tap Edit.
Scroll to Complications.
Choose a slot, then select Dexcom G7. The available complication shapes vary by face corner, circular, infograph, modular most faces have at least one slot that works.
Save. Your glucose value and trend arrow are now glanceable on the wrist.

Step 4 Watch face recommendations

Faces that work well with Dexcom complications:

Modular Compact / Modular Duo large enough to show value + arrow + small chart.
Infograph good for those who want multiple complications without clutter.
Photos / Portrait minimal, single complication, ideal for keeping the data subtle.
Smart Stack widgets (on newer watchOS) Dexcom G7 widget surfaces automatically when readings are unusual.

Step 5 Notifications, alarms, and silent modes

The watch handles alarms differently from the phone, and the differences trip people up.

The Apple Watch by default delivers haptic taps. Alarm sounds depend on watch’s silent mode and the phone’s pairing state.
For night-time use, make sure the watch’s Sleep Focus doesn’t silence the urgent-low. Settings → Focus → Sleep → Allowed Apps → Dexcom G7.
If you wear the watch to bed, set the wrist-detection to ON. This makes haptic alarms genuinely effective at waking you.
If you sleep without the watch, the phone needs to be the primary alarm device. Don’t rely on the watch on the bedside table it doesn’t behave the same way as on your wrist.

What Direct-to-Watch is good for

Running, cycling, swimming. Leave the phone at home; the watch holds the data.
Around the house. The phone can stay in another room.
Sports where the phone is a hassle surfing, gym, climbing, hiking.
Travel. One less device to fish out of the bag.

What it isn’t great at

Long-distance from the watch. Bluetooth range is around 6 metres. If the watch isn’t on your wrist, the sensor stops talking to it.
Followers. Sharing data to family or carers happens through the phone app. If you go out without the phone, followers see a gap until you reconnect.
Calibration prompts. Most calibrations need the phone.
Battery life. Direct-to-Watch uses more Apple Watch battery than companion mode. Plan for charging once a day.

Common pitfalls

Forgot to enable Direct-to-Watch at sensor start. You can’t add it after. You’ll be in Companion mode for this sensor’s whole life. Set a calendar reminder for sensor change day to enable it next time.
Apple Watch alarms silent. Check watch Focus settings; check that Dexcom G7 is in the allow list of every relevant Focus mode.
Complication shows ” ” instead of a number. Usually a Bluetooth re-sync open the G7 watch app for a few seconds and the complication updates.
Watch app crashes at sensor change. Restart the watch (hold side button → power off → restart) before starting the new sensor.
Battery drains fast. Reduce complication-refresh on other apps; lower screen wake time; close unused background apps on the watch.

My practical setup

I run Direct-to-Watch all the time. The complication on the watch face is a Modular Compact corner. Sleep Focus has Dexcom G7 explicitly allowed. I keep the phone nearby at night because that’s still my primary alarm device the watch is the everyday convenience layer, not the safety net.

How to Set Up Dexcom G7 with Apple Watch (Including Direct-to-Watch)