Trendline is an iPhone app that reads Apple Health. This page covers getting Fitdays readings into Health; why Health is the right destination at all is its own page.
If the scale on your bathroom floor says Bveiugn (often sold under the name "Posture"), Healthkeep, Lepulse or Lescale, DEIK, or FITDAYS itself, the app in your pocket is almost certainly Fitdays. You searched for the scale brand; the software answer is the same for all of them.
Which scales use this app
Fitdays is published by Guangdong Icomon Technology (App Store listing), a Chinese manufacturer whose hardware ships on Amazon under many storefront brands. The pattern is easy to inspect from the brands' own pages:
- Bveiugn / "Posture" — Amazon listings for the "Posture" smart scale sit under the Bveiugn brand name (Amazon listing), and the Fitdays site hosts the Posture scale's user manual (fitdays.app).
- Healthkeep — the company's own product pages tell buyers to download Fitdays and note it syncs with Apple Health and Google Fit (Healthkeep product page).
- Lepulse / Lescale — Lepulse's setup guide begins with downloading Fitdays from the App Store (Lepulse: how to use the app).
- DEIK, Vitafit-adjacent brands, FITDAYS-branded scales — the same app appears across further budget listings and manuals.
This matters for one practical reason: whatever brand is printed on the glass, the sync behavior, the account model, and the fixes below are the app's, not the scale's.
Yes, it writes to Apple Health
The App Store listing states that when you weigh in with a connected scale, the measurement data "supports synchronization with Apple Health" (Fitdays on the App Store, checked July 20, 2026). The vendor's own guide lists per-metric toggles for the sync, including weight, body fat percentage, lean body mass, and BMI (fitdays.org: connect Apple Health). That guide also names muscle mass, bone mass, and body water — but Apple Health has no data type for those, so the metrics that can actually land in Health are the ones Health can store: weight, body fat %, lean body mass, BMI.
One boundary to set expectations correctly: nothing in the vendor's documentation describes transferring past readings. Treat the sync as flowing forward from the day you enable it — weigh-ins already trapped in the app are not documented to make the trip.
How to turn it on
Two documented paths, either works:
- From Fitdays: open the app, go to Me → Setting → Apple Health, toggle on the data types you want written, and grant the iOS permission sheet when it appears (vendor guide).
- From Apple Health: open the Health app, find Fitdays under Sources, and select the data it may write (vendor guide). You can review or revoke the same permissions any time under Settings → Health → Data Access & Devices (Apple's security guide).
One account, 24 people, one Health record
Fitdays is built around a shared family account: the vendor's FAQ documents up to 24 user profiles plus one "visitor" under a single login, with the visitor profile limited to weight, BMI, and body-fat display and unable to record data at all (Fitdays FAQ). Reviewers on the App Store listing describe how that model feels in a real household: family members sharing one account with no privacy between profiles, and one 2024 reviewer whose app locked onto a spouse's profile and wouldn't switch back (review themes on the listing, checked July 20, 2026). The same reviewer reported being unable to find any working customer-support channel.
Apple Health makes the sharp edge sharper: the Health store on an iPhone is that phone owner's record. The vendor's documentation does not say how — or whether — a shared account's other profiles reach Apple Health. The safe arrangement is the same one that works for every shared-account scale app: each adult runs the app on their own iPhone, so their weigh-ins write to their own Health record. Anyone whose readings can't make the trip can add a reading to Apple Health by hand — a manual entry has the same standing as a synced one.
On accounts generally, honesty about what we could and couldn't verify: the vendor's FAQ describes setup as registering an account by email, and its only documented no-account mode is that limited visitor profile; a 2024 reviewer likewise describes being required to log in before using the app. We have not independently confirmed whether any fuller account-free use exists — if it does, the vendor doesn't document it.
When sync fails
The vendor's documented checklist is short (FAQ, sync guide):
- Finish the measurement. The vendor states data for the day appears only after a completed measurement — step on, wait for the composition cycle to end, and keep the app open while it happens. A long-running review theme echoes this: readings recorded only while the app was open during the weigh-in.
- Check the permission. Health app → Sources → Fitdays (or Settings → Health → Data Access & Devices): confirm write access is on for the types you expect. Toggling a category off and back on re-issues the permission.
- Check the network. The vendor's FAQ notes registration and sync assume an internet connection.
- The vendor's help route is inside the app: Mine → Setting → Help.
Whatever misbehaves, readings that already landed in Apple Health are unaffected — once written, they belong to Health, not to Fitdays.
What lands where
| What Fitdays writes to Apple Health | What Apple Health can store | What Trendline reads from Health |
|---|---|---|
| Weight per the App Store listing; the vendor's guide adds toggles for body fat %, lean body mass, and BMI (fitdays.org, July 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. |
When Trendline launches, it will also accept manual entries for the composition values Apple Health has no type for — the body water, muscle, and bone numbers that today live only inside Fitdays.
Try the idea
Once a few weeks of weigh-ins are flowing, the raw series will bounce — that's variation, not a defective scale. Paste your readings into the free weight trend calculator — it runs in your browser, nothing uploads — and compare the raw measurements against a deliberately slower signal. The direction underneath is the number worth watching.
Sources
- Fitdays on the App Store (developer, Apple Health language, review themes)
- fitdays.org: how to connect Apple Health (enable path, data-type toggles)
- fitdays.app: how to connect Apple Health (Health-side path, post-measurement note)
- Fitdays FAQ (registration, 24-user account, visitor mode, troubleshooting)
- Healthkeep product page (directs buyers to Fitdays)
- Lepulse: how to use the app (directs buyers to Fitdays)
- Amazon: "Posture" scale under the Bveiugn brand
- Apple: protecting access to Health data (Data Access & Devices)
Trendline is not affiliated with or endorsed by Guangdong Icomon Technology, Fitdays, or any scale brand named on this page. Vendor behaviors change; everything above was verified against the linked pages on July 20, 2026.