Scale Relay: Smart Scale Sync
Body composition, any scale
Only for iPhone
Free · In‑App Purchases
iPhone
New: Bluetooth weigh-ins can go to Apple Health too, and a Shortcuts action syncs to Garmin without opening the app. Two syncs free, then one purchase, no subscription.
Get your smart scale's weigh-ins into Garmin Connect, straight from your iPhone. Two ways in, one tap out.
APPLE HEALTH ROUTE: ANY SCALE
If your scale's app saves weight to the Health app, Scale Relay picks it up and sends it to Garmin Connect. Works with Withings, Renpho, Eufy, Etekcity, Zepp Life, Wyze, Picooc and any other app that writes weight to Apple Health. Body fat and BMI come along when your scale's app provides them. With the Sync to Garmin action in Shortcuts, an automation can send new weigh-ins without opening the app.
BLUETOOTH ROUTE: XIAOMI SCALES, NO OTHER APP NEEDED
Step on a Mi Body Composition Scale 2 or a Xiaomi Body Composition Scale S400 and Scale Relay reads the measurement directly: weight, body fat, muscle mass, bone mass, water, BMI and BMR. It can also save each weigh-in to Apple Health. The S400 needs a one-time authorization with your Xiaomi account.
WHAT YOU GET
• A preview of every weigh-in before it is sent; nothing leaves without your tap or your Shortcut
• Body composition in Garmin Connect, not just the weight
• Bluetooth weigh-ins saved to Apple Health too, if you turn it on
• A Sync to Garmin action for Shortcuts and automations
• Weigh-ins from the last 7 days are included; Garmin Sync unlocks older history
• One Garmin sign-in, two-factor authentication supported
• A "Sent to Garmin" list so you know what arrived
FREE TO TRY
Your first two syncs are free on either route. Unlimited syncing is a single one-time purchase called Garmin Sync. No subscription.
PRIVACY FIRST
Your measurements stay on your iPhone and go only to your own Garmin account and, if you choose, to Apple Health. No Scale Relay account, no tracking, no ads.
REQUIREMENTS
• iOS 17 or later
• A Garmin Connect account
• Apple Health route: any scale app that writes weight to the Health app
• Bluetooth route: Mi Body Composition Scale 2 or Xiaomi Body Composition Scale S400
Scale Relay is an independent app. It is not affiliated with, endorsed by or associated with Garmin, Xiaomi, Withings, Renpho, Eufy, Etekcity, Zepp, Wyze, Picooc or any other scale or fitness-platform maker. Product names are trademarks of their respective owners.
Ratings & Reviews
- This app’s overall rating was recently reset.
• More reliable Bluetooth: Scale Relay now restarts listening for your scale every time you open it, so turning Bluetooth off and on is no longer needed.
• Set your profile: Scale Relay now asks for your sex, height and age, which body fat depends on most, instead of quietly using a default.
• Body type and water now follow the original formula in a few edge cases.
• A short note explains that body fat from a home scale is an estimate.
The developer, Marcin Naglik, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Marcin Naglik
- Size
- 1.7 MB
- Category
- Health & Fitness
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Garmin Sync $14.99
- Copyright
- © 2026 Marcin Naglik
