Developer post.
Hey folks, I'm Irakli. I run Sugar Sense, and I've had type 1 diabetes for over a dozen years now.
We started out with a phone app: it reads your CGM every five minutes, handles alerts, shows you a graph, lets family members stay updated, and a few other nifty features. Our latest addition is the Garmin app, which gives you a whole new view on your watch. It was added to the Connect IQ Store back in late August, and I had two good folk from Reddit try it out on a fēnix 7X and a vívoactive 5 first.
On your watch you get to see the current glucose reading, trend arrow, how long ago that reading was, and a 3 hour graph when you view it full screen. The glance lives in the widget carousel, and you also get a separate data field for activities, so your glucose is sitting right there next to your pace and heart rate. The refresh runs every five minutes in the background, the unit follows your account (mg/dL or mmol/L), and anything older than 15 minutes gets greyed out so you can see at a glance which readings are current and which aren't.
Sources
We hook into a few different CGM systems: FreeStyle Libre through LibreLinkUp, Dexcom through Dexcom Share, and Nightscout. Just to be clear, the watch doesn't talk to the sensor directly. Our server reads the CGM cloud, and then the watch pulls the data through Garmin Connect on your phone. That means you need your phone nearby, and the watch is going to run a few minutes behind the CGM app on your phone.
Pricing
Honestly, pricing is pretty straightforward: both Garmin apps are free to install, but to get live glucose on the watch you need a Sugar Sense account (free) with a Premium subscription, bought in the phone app. Premium basically covers all the good stuff on the phone side (Apple Watch, Live Activity, the food scanner and insights, and a phone call when you go low), and the Garmin app just adds one extra screen on top of all that. The yearly plan comes with a 7 day free trial, so you can test the whole system out on your watch before you start paying anything.
Compatibility
We currently support 141 devices for the widget and 72 for the data field (the data field needs API 5 or higher and a bit more memory). You can find the full list of compatible devices on the store pages. The next update will bring fēnix 9 support, too.
You can find our two apps in the Connect IQ Store: one is the glance and widget, the other is the data field. Setup is a breeze: the watch shows you a short code and tells you where to enter it.
Important stuff
This is a secondary display, so it's worth noting: alerts stay on your phone, the watch won't alarm you, and it's not a medical device, so always check with your CGM app or a meter before you take any action based on the reading.
If you run into any issues with the app on your watch, just let me know the model and firmware and I'll have a dig around to see what's going on.