Trendline is an iPhone app that reads Apple Health. This page covers getting OKOK readings into Health; why Health is the right destination at all is its own page.
If your scale's manual told you to install OKOK International — common with WeGuard scales and with unbranded scales from Walmart, Temu, and AliExpress — this page is for you. Many owners never chose this app; it chose them, one QR code at a time.
Which scales use this app
OKOK International is published by Shenzhen Careyou Health Science and Technology (App Store listing), and its Android build ships under the package name com.chipsea.btcontrol.en (Google Play listing). That package name is the tell: Chipsea is a Shenzhen chip designer, and its published smart-body-fat-scale offering is a bundle — the measurement chip inside the scale, the Bluetooth chip, the OKOK app, and the cloud service behind it, sold together to whoever wants to ship a scale (Chipsea: smart body fat scales). This is white-labeling at the silicon level: the brand on the glass can be anything, because the electronics and the app come as a kit.
Concretely verifiable pairings: WeGuard's own Amazon listings direct buyers to install OKOK International (WeGuard listing), and a reviewer on the App Store listing describes pairing a Temu-bought scale with it. If your scale has no recognizable brand at all, OKOK is one of the most likely apps its manual names.
What it writes to Apple Health: weight, and only weight
The App Store description is unusually plain about scope: with your authorization it will "synchronize all weight data to your Health app" (OKOK International on the App Store, checked July 20, 2026). Weight — not body fat, not water, not muscle. The composition estimates the scale displays stay inside OKOK; Apple Health receives the body-mass number.
Honest boundaries, both directions: weight is also the metric that matters most for a trend, so this narrow sync still does the essential job. And nothing in the listing documents transferring past readings — treat the sync as flowing forward from the day you authorize it.
The ad experience, as reviewers describe it
We describe what App Store reviewers report, with dates, and claim nothing about anyone's intent. Across 2024 and 2025, reviewers on the listing describe full-screen ads appearing when the app opens, close buttons sitting behind the status bar or camera notch where they can't be tapped, video ads playing before a weigh-in can be recorded, and needing to force-quit and relaunch to get past them. Several of those reviewers state they own the connected scale; the listing offers subscription tiers but reviewers note no one-time purchase (review themes on the listing, checked July 20, 2026). The app's overall rating remains high at 4.7 stars across roughly 15,000 ratings — both things are true, and you can read the listing yourself.
How to turn the sync on
The listing's phrase is "with your authorization": OKOK requests Apple Health access through the standard iOS permission sheet. Grant it write access for Weight when asked. If you declined earlier — or aren't sure — you can grant or revoke it yourself: Settings → Health → Data Access & Devices → OKOK, or in the Health app under your profile picture → Apps (Apple's security guide). Then take a weigh-in with the app open and check Health → Browse → Body Measurements → Weight for the new reading.
The escape logic
Here is the practical payoff, and it's the whole reason to bother: once your weigh-ins land in Apple Health, they are readable by any Health-reading app, forever, with no ads in front of them. The record on your iPhone belongs to you, not to the app that wrote it. From that point OKOK has exactly one remaining job — moving the next reading from the scale into Health — and nothing else about your history depends on it. If even that trip becomes more trouble than it's worth, the scale still measures: add the reading to Apple Health by hand and it has identical standing to a synced one.
What lands where
| What OKOK writes to Apple Health | What Apple Health can store | What Trendline reads from Health |
|---|---|---|
| Weight only, per its own description (App Store listing, 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 values OKOK doesn't write to Health — body fat % into Health's own type, and composition numbers Health has no type for, like body water.
Try the idea
Day-to-day weight moves for reasons that have nothing to do with progress — that bounce is variation, not a verdict. Paste a few weeks of measurements into the free weight trend calculator (in your browser, nothing uploads) and compare the raw weigh-ins against a deliberately slower signal. That's the reading your history deserves once it's out of the silo.
Sources
- OKOK International on the App Store (Health sync scope, review themes, rating)
- OKOK International on Google Play (com.chipsea.btcontrol.en package)
- Chipsea Technologies: smart body fat scale solution (chip + OKOK app + cloud bundle)
- Chipsea Technologies: company profile (signal-chain IC design)
- Amazon: WeGuard body fat scale (directs buyers to OKOK)
- Apple: protecting access to Health data (Data Access & Devices)
Trendline is not affiliated with or endorsed by Shenzhen Careyou, Chipsea Technologies, WeGuard, or any scale brand named on this page. Vendor behaviors change; everything above was verified against the linked pages on July 20, 2026.