Name: DiaGlow — Nightscout Diabetes Watch Face
Rating: 4.5 (2 reviews)
Author: boolat

DiaGlow displays real-time continuous glucose monitor (CGM) readings directly on your Garmin watch face — glucose value, trend arrow, and a 60-minute history sparkline, wrapped in a radial glow that shifts color with your glucose zone (very low, low, in range, high, very high).

It reads your glucose from either your own Nightscout site or from xDrip+ running on your phone. Because it takes finished readings from one of those, the sensor brand doesn't matter — Dexcom, FreeStyle Libre, CareSens, Medtrum and anything else xDrip or Nightscout supports all work the same way.

Built for people managing diabetes with a Nightscout- or xDrip-connected CGM, DiaGlow puts your glucose front and center every time you check your wrist. No opening the phone, no separate app, no digging through menus.

KEY FEATURES
• Real-time glucose value, refreshed every 5 minutes (Garmin's background limit) from your Nightscout server or from xDrip+ on your phone
• Works with any CGM — the reading comes from Nightscout or xDrip, not from a specific sensor vendor
• xDrip+ mode needs no internet connection: the reading travels from your phone to the watch over the local Bluetooth link
• Trend arrow and rate-of-change delta, with three selectable calculation modes
• 60-minute glucose history as a compact sparkline that ages out old readings automatically
• Color-coded glow for very low, low, in-range, high, and very high zones, glanceable at arm's length
• mmol/L or mg/dL, your choice
• 12-hour (AM/PM) or 24-hour time
• Configurable glucose zone thresholds to match your own targets
• Stale-data safeguard: past 20 minutes old, the display visibly grays out and flags the data's age instead of quietly showing an old reading as if it were current
• Battery, date, and time
• Supports 74 Garmin devices across the fēnix, Forerunner, Venu, Marq, Descent, Approach, D2, epix, and vívoactive families

REQUIREMENTS
Choose one data source in the app's Settings after install:
• Nightscout — your own Nightscout site (nightscout.github.io) with API v1 enabled, plus your Nightscout URL and API secret (or a scoped read-only token). Works on any phone; needs an internet connection.
• xDrip+ — xDrip+ on the phone paired with your watch, with "xDrip Web Service" enabled (Settings ▸ Inter-app settings). Android only; no internet connection needed. Leave the URL and secret fields blank unless you enabled web-service authentication in xDrip.

PRIVACY
DiaGlow has no backend server of its own. In Nightscout mode, your URL and secret are used only to make a direct request from your watch to your own Nightscout site. In xDrip+ mode, the request never leaves the local link between your watch and your phone. Nothing is sent to, stored by, or visible to the developer. No analytics, no ads, no tracking. Full privacy policy: https://bolattleubayev.github.io/diaglow/privacy-policy.html

DISCLAIMER
DiaGlow is an independent, community-built, free and open-source project. It is not affiliated with, endorsed by, or sponsored by Garmin, Dexcom, Abbott, the xDrip+ project, or the Nightscout Foundation. It is not a medical device and is not a substitute for your primary CGM receiver or app — always confirm glucose readings and trends on your CGM's official display before making any treatment decision, including insulin dosing. Displayed data may be delayed, stale, or unavailable due to network, phone, or server issues. Use at your own risk.

Source code, license, and full documentation: https://github.com/bolattleubayev/diaglow