Xiaomi scales come in two generations with different apps. The older Mi Body Composition Scale pairs with Zepp Life, and the newer S400 pairs with Xiaomi Home, not Mi Fitness. Each has its own Apple Health path. For the newer generation, Xiaomi documents that only new readings and only the master account's data sync.
Trendline is an iPhone app that reads Apple Health. This page covers getting Xiaomi readings into Health; why Health is the right destination at all is its own page.
First, identify your generation
Xiaomi's scales split into two families that use different companion apps with different Apple Health paths, and the vendor documents them on separate pages:
- Older generation: Mi Body Composition Scale and Mi Body Composition Scale 2 pair with Zepp Life, the app formerly named Mi Fit (Xiaomi support KA-12890).
- Newer generation: the Xiaomi Body Composition Scale S400 pairs with Xiaomi Home, not Mi Fitness (Xiaomi support KA-235575).
We verified those two models only; for any other Xiaomi scale, check Xiaomi's support page for that exact model rather than assuming it follows one of these paths. If you follow an older tutorial and hunt for a Health toggle in the wrong one of these apps, you'll conclude the sync doesn't exist. It does — it just lives where your scale's generation put it.
Older generation: Zepp Life
Xiaomi's article for this generation routes the setup through Apple Health itself, not through Zepp Life's menus (KA-12890, read October 18, 2026): open Apple Health, tap your avatar (top right), tap Apps under the privacy section, find Zepp Life, and choose which data types the app may write. After that, the article says data "such as the number of steps, sleep data and weight" appears in Health.
Note what the vendor does and doesn't name: weight is explicitly listed; body-composition types are not. Zepp Life's App Store copy confirms HealthKit support but publishes no type list either (Zepp Life on the App Store, checked October 18, 2026). So count on weight reaching Health, and check your own Health app's data sources before assuming body fat % or lean mass makes the trip from this generation.
Xiaomi scale not syncing through Zepp Life?
Xiaomi publishes no troubleshooting steps for this path, and we could not re-read the owner thread we previously cited, so we no longer pass on owner-reported fixes. What Apple documents (Manage Health data): in Health, tap your profile, then Apps, then Zepp Life, and confirm the categories you want are on. Under a data type's Data Sources & Access, Health lists the sources that contribute to it. If two sources report the same data type, Health uses the one at the top of the list first; reordering the list changes which source Health uses, and does not by itself make Zepp Life write readings it never wrote.
Newer generation: Xiaomi Home, and two limits Xiaomi actually documents
For the S400 era, the switch lives in iOS settings, not in the app (KA-235575, read October 18, 2026): iPhone Settings → Health → Data Access & Devices → Xiaomi Home, then enable the permissions the doc names: weight, body fat rate, height, and body fat index. We read "body fat index" as BMI, but Xiaomi does not say so. Xiaomi's App Store listing for Xiaomi Home describes a different set (BMI, body fat percentage, weight, and lean body mass shared to Apple Health), so Xiaomi's own sources disagree on the exact types. Check which categories your Xiaomi Home entry shows in Health, then confirm with a new weigh-in. The doc is blunt that without the permissions, nothing transfers.
Then come two limits, both stated in the same FAQ:
- New readings only. Xiaomi states that after enabling, "the newly measured data will be automatically synchronized" — meaning weigh-ins taken before you flipped the switch stay behind. Xiaomi's page documents new-measurement behavior only and describes no way to import earlier readings.
- Master account only. The same FAQ states "only the data of the current master account will be synchronized" — family members' measurements on a shared scale don't reach this iPhone's Health store.
Anyone on the wrong side of either limit — pre-sync history, or a family member's readings — can still add weigh-ins to Apple Health by hand. Apple's Health guide describes manual entry, and says that where several sources report the same data type, Health uses the one at the top of its priority list.
What lands where
| What Xiaomi's apps writes to Apple Health | What Apple Health can store | What Trendline reads from Health |
|---|---|---|
| Newer (S400 → Xiaomi Home): weight, body fat, height, and "body fat index" per KA-235575; the Xiaomi Home App Store listing instead names BMI, body fat percentage, weight, and lean body mass, so confirm in your Health app. Older (→ Zepp Life): weight is vendor-named; a composition-type list is not published (KA-12890, checked October 18, 2026). | Weight, body fat %, lean body mass, BMI, height, waist circumference | Weight, body fat %, lean body mass — with height as context. BMI and waist are not imported. |
Trendline also accepts manual entries for the composition values Apple Health has no type for — the muscle, water, and bone figures that otherwise stay in Xiaomi's apps.
Try the idea
With the sync running, your Health chart will show honest day-to-day variation — readings bouncing around the direction they're actually headed. Paste a few weeks of weigh-ins into the free weight trend calculator to see the raw series against a deliberately slower signal; that slower line is what your scale has been trying to tell you.
Questions people ask
Which app do I use with my Xiaomi scale and Apple Health?
It depends on the generation. The Mi Body Composition Scale and Scale 2 pair with Zepp Life (formerly Mi Fit); the Xiaomi Body Composition Scale S400 pairs with Xiaomi Home, not Mi Fitness. Check Xiaomi's support page for other exact models.
How do I sync a Mi scale with Apple Health through Zepp Life?
Xiaomi's article routes it through Apple Health: open Apple Health, tap your avatar (top right), tap Apps under the privacy section, find Zepp Life, and choose which data types the app may write.
How do I sync the Xiaomi S400 with Apple Health?
In iPhone Settings, go to Health, Data Access & Devices, Xiaomi Home, and enable the permissions Xiaomi names: weight, body fat rate, height, and body fat index. The doc is blunt that without the permissions, nothing transfers. Xiaomi Home's App Store listing instead names BMI, body fat percentage, weight, and lean body mass, so check which categories your Health app shows.
Will my old Xiaomi readings sync to Apple Health?
For the newer generation, no. Xiaomi states that after enabling, the newly measured data will be automatically synchronized, so earlier weigh-ins stay behind. You can add them to Apple Health by hand.
Why did my Xiaomi scale stop appearing in Apple Health with Zepp Life?
Xiaomi publishes no troubleshooting steps for this path. What Apple documents: in Health, tap your profile, then Apps, then Zepp Life, and confirm the categories you want are on. Under a data type's Data Sources & Access, Health lists the contributing sources and uses the one at the top first when several report the same type. Reordering that list does not make an app write readings it never wrote.
Sources
- Xiaomi support KA-12890: How to sync Zepp Life to Health App (older-generation path, weight named)
- Xiaomi support KA-235575: S400 measurement data and Apple Health (newer-generation path, data types, new-readings-only and master-account-only limits)
- Zepp Life on the App Store (HealthKit support statement)
- Xiaomi Home on the App Store (Health data listed as shared)
- Apple: manage Health data (app categories, source priority, manual entry)
Trendline is not affiliated with or endorsed by Xiaomi, Zepp Health, or Huami. Vendor behaviors change; everything above was checked against the linked pages on October 18, 2026, with both Xiaomi support documents read in a browser on that date.