Scale Relay vs ScaleSynch
Price, ratings, monetisation and update history for both apps, side by side โ with what reviewers say about each.
Scale Relay
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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 โข A preview of every weigh-in before it is sent; nothing leaves without your tap or your Shortcut โข Body composition in Garmin Connect, not just the weight โข Bluetooth weigh-ins saved to Apple Health too, if you turn it on โข A Sync to Garmin action for Shortcuts and automations โข Weigh-ins from the last 7 days are included; Garmin Sync unlocks older history โข One Garmin sign-in, two-factor authentication supported โข 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 โข iOS 17 or later โข A Garmin Connect account โข Apple Health route: any scale app that writes weight to the Health app โข 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.
ScaleSynch
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ScaleSynch makes every weigh-in effortless. It works with Chipsea/OKOK-compatible Bluetooth scales, so you just step on the scale with bare feet and the app captures your weight instantly. No pairing screens, no codes, no extra taps. Start fast with no account required. Open the app once, grant Apple Health permissions, then simply weigh yourself. ScaleSynch records each measurement in seconds and stores your data without any login or signup. Turn daily weigh-ins into meaningful progress. See clear trend lines, weekly averages, and changes over time to separate real progress from day-to-day fluctuations. Integrated with Apple HealthKit for a complete view. Your weight measurements are written to the Health app, where you can see them alongside activity, nutrition, sleep, and more. One place, one timeline. Why ScaleSynch - Truly automatic capture: step on, get weighed, and you are done. - No pairing required: skip Bluetooth setup and failed connections. - No account or password: less friction, more privacy. - HealthKit integration: all your metrics in one secure ecosystem. - Clear trends over time: from daily checks to long-term progress. Make weighing in a one-step habit and get the insights that matter.
Screenshots
Verdict
The clearest difference is update cadence: Scale Relay at every 2 weeks against ScaleSynch's monthly. Scale Relay also leads on iOS requirement (17.0 vs 26.0). On price, ads, in-app purchases and device support there is nothing between them.
Scored on Price ยท Rating ยท Positive reviews ยท Number of ratings ยท Update frequency ยท Ads ยท In-app purchases ยท Monetization ยท Best chart rank ยท Devices ยท Requires iOS
Both are free to download. Scale Relay sells 1 one-off in-app purchase and ScaleSynch sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.
Scale Relay ships an update every 2 weeks, ScaleSynch monthly. The most recent releases landed on October 31, 2026 and October 25, 2026 respectively.
| Parameter | Scale Relay | ScaleSynch |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 2 weeks โ better | Monthly |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Devices | iPhone | iPhone, Apple Watch โ better |
| Requires iOS | 17.0 โ better | 26.0 |
| Further details โ not scored | ||
| Size | 2 MB | 3 MB |
| Age rating | 4+ | 4+ |
| Developer | Marcin Naglik | Rob In der Maur |
In-app purchases
Scale Relay
- Garmin Sync$14.99
ScaleSynch
- Unlimited real BT scanes$2.99
Questions
Is Scale Relay free?
Is ScaleSynch free?
Do Scale Relay or ScaleSynch have ads?
Which is updated more often, Scale Relay or ScaleSynch?
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