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 (and kin) — pairs with Zepp Life, the app formerly named Mi Fit (Xiaomi support KA-12890).
- Newer generation — Xiaomi Body Composition Scale S400 and its era — pairs with Xiaomi Home, not Mi Fitness (Xiaomi support KA-235575).
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 July 20, 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 July 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.
When Zepp Life stalls
The recurring owner complaint with this pipeline is a silent stall: readings sit in Zepp Life and stop appearing in Health, with no error shown. A long Apple Support Communities thread on Zepp Life syncing (that one about step data moving through the same app-to-Health pipeline) collects the fixes owners report: force-close both Zepp Life and Health, then relaunch Zepp Life — one poster reports sync resuming after the restart — and, separately, raising Zepp Life in Health's Data Sources & Access priority list so its readings aren't hidden behind another source (Apple Support Communities thread 254829299). Owners in the same thread report the stall can recur, so the force-close pair is worth keeping in your pocket rather than treating as a one-time cure.
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 July 20, 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 (Xiaomi's phrasing; in Health's vocabulary those land as weight, body fat %, height, and BMI). The doc is blunt that without the permissions, nothing transfers.
Then come two sentences almost no scale vendor is willing to publish, both 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 is the one brand that documents its backfill behavior, and the documented answer is: there isn't any.
- 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; a manual entry has the same standing in Health as a synced one.
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, BMI (KA-235575, July 2026). Older (→ Zepp Life): weight is vendor-named; a composition-type list is not published — verified types only (KA-12890). | 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. |
When Trendline launches, it will also accept 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.
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)
- Apple Support Communities thread 254829299: Zepp Life sync stall and the force-close-both-apps fix
Trendline is not affiliated with or endorsed by Xiaomi, Zepp Health, or Huami. Vendor behaviors change; everything above was verified against the linked pages on July 20, 2026, with both Xiaomi support documents read in a browser on that date.