Yolanda, Feelfit, and FITINDEX are three scale apps with a shared Qingniu software lineage and three different App Store sellers, and all three listings commit to HealthKit sync. Yolanda and FITINDEX list weight, body-fat percentage, fat weight, height, BMI, and resting calorie consumption. None of the three documents transferring past readings into Health.
Trendline is an iPhone app that reads Apple Health. This page covers getting readings from these three apps into Health; why Health is the right destination at all is its own page.
If your scale's manual points at Yolanda, Feelfit, or FITINDEX, or your scale is a FitIndex, a generic "QN-Scale", or an orphaned ABYON, this page is for you. We do not have a vendor source that puts ABYON in the same family; the ABYON section below says what owners report.
Which scales use these apps
The family resemblance is inspectable. Yolanda is sold on the App Store by Shenzhen QingNiu Software (Yolanda listing). Feelfit and FITINDEX appear under different seller names on their App Store pages (Global eFit and PANATRADE respectively), but their Android builds ship under the package names com.qingniu.feelfit and com.qingniu.fitindex (Feelfit on Google Play, FITINDEX on Google Play), and their listings describe Apple Health sync in near-identical sentences. Three storefronts with three different sellers, and a shared Qingniu software lineage. We have not found a source that names one maker. Which app is whose:
- Yolanda: sold by Shenzhen QingNiu Software. An owner's report on the openScale project's issue tracker describes connecting a "QN-Scale from Yolanda" (openScale project: QN-Scale support); that is one owner's account, not vendor confirmation.
- Feelfit: its listing says that when you use "our smart scale" to measure your weight, the relevant data supports synchronization with HealthKit (Feelfit listing).
- FITINDEX: the app for FITINDEX-branded scales. Its App Store subtitle reads "For FITINDEX Scale", and the FITINDEX manual tells owners to download the app named FITINDEX (FITINDEX manual).
What each writes to Apple Health
All three listings commit to HealthKit sync, checked live on October 18, 2026:
- Yolanda and FITINDEX use nearly the same sentence: weight, body-fat percentage, fat weight, height, BMI, and resting calorie consumption "will be synchronized to HealthKit" (Yolanda listing, FITINDEX listing). Apple Health has body-measurement types for weight, body fat %, BMI, and height from that list, but no dedicated "fat weight" body type (Apple's HealthKit type list), and the listings do not say how their "fat weight" and "resting calorie consumption" labels map to Health types.
- Feelfit phrases it around the weigh-in: measure with the connected scale and the relevant data "supports synchronization with HealthKit" (Feelfit listing). Each app asks about HealthKit at login or registration.
None of the three documents transferring past readings into Health. Check Health after you enable sync instead of assuming history makes the trip.
The FITINDEX chart complaint — and the fix you already own
One current App Store review of FITINDEX is about the in-app trend chart, not the sync. On October 18, 2026 the listing showed a review from the previous week saying the one-week chart shows the last seven readings, so if you weigh irregularly, seven readings spread over twelve months appear as a seven-day trend (FITINDEX reviews). That is one reviewer's report, and we have not tested the app ourselves.
We won't editorialize beyond what's observable: a chart that shows the last seven points as a week can't show a rate of change over real time. Apple Health stores each reading with its own date and time, and depending on the data type offers weekly, monthly, and yearly views (Apple's guide). Once your weigh-ins sync, a chart built on real dates is one app away, and any Health-reading app can offer a more careful one still.
ABYON owners: the Feelfit route
ABYON's own app is gone: its former App Store and Google Play listing pages both returned "not found" when we checked on October 18, 2026. The community thread that formed around the loss (Apple Support Communities, posts from December 2024 to April 2025, re-read on October 18) starts with owners finding the app missing at the end of 2024. In it, one owner recommends Feelfit as compatible with the scale, and two others say they connected their ABYON scales to it. One of them adds that Feelfit syncs with Apple Health, which they say the ABYON app never did as far as they could tell. Treat all of this as owner reports: Feelfit's own listing does not mention ABYON, and we found no vendor page confirming compatibility.
The same thread carries two caveats. One owner reports Feelfit cannot access the data in the old ABYON app, and another says they lost almost five years of readings. A different owner, in April 2025, says they could still see ABYON measurements inside Apple Health's data and its export, so check Health before assuming your history was never synced. The fuller story, what's recoverable and what isn't, is on our orphaned-scale page.
How to turn the sync on
- In the app: each of the three asks about HealthKit when you log in or register, per its listing — accept, and grant the iOS permission sheet for the data types you want written.
- If you declined earlier: Settings → Health → Data Access & Devices → the app's name, and turn write access on; or in the Health app under your profile picture → Apps (Apple's security guide).
- Then verify: take a weigh-in with the app open and check Health → Browse → Body Measurements → Weight. Thirty seconds of checking beats a month of missing measurements. If sync won't behave, re-toggle the Health permission, and remember the fallback: a manual Health entry is a normal Health record, and by default Health prioritizes manually entered data above data from apps (Apple Support).
Readings already written to Apple Health are stored in Health itself, under your control, and you can delete them there (Apple Support). Apple does not say what happens to a source app's samples if that app is later removed, so check Health yourself if one of these apps goes away.
What lands where
| What these apps writes to Apple Health | What Apple Health can store | What Trendline reads from Health |
|---|---|---|
| Yolanda & FITINDEX: weight, body fat %, BMI, height per their listings (the listings also name fat weight and resting calorie consumption). Feelfit: weigh-in data, weight-centric, per its listing (all three checked October 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 clinic-scan reports that can hold composition values Apple Health has no type for, such as body water, skeletal muscle mass, and visceral fat. The listings advertise such measurements in-app but do not claim they sync to Health.
FITINDEX, Feelfit, or Yolanda not syncing to Apple Health?
FITINDEX's manual for the FT-24D, ES-26M, ES-26M-B, FT-26H-B, and FT-26BB-B gives two steps for readings that don't sync (FITINDEX manual); other FITINDEX models may differ:
- Reconnect the scale. In the FITINDEX app, tap "+", then Device Management, swipe the scale left to delete it, and connect it again. Restarting the phone can also help.
- Check Bluetooth, then reinstall. In the app's Settings, run Bluetooth Anomaly Detection and upload the report if it finds a problem, then delete and reinstall the app.
The same manual says to turn on all of FITINDEX's categories in Apple Health. On current iOS that's in the Health app under your profile picture, then Apps, then FITINDEX. For Feelfit and Yolanda, start with the same Health-side check: open the app under Apps and allow the categories you want. If another app also writes weight, check the order in Health's Weight category under Data Sources & Access (Apple Support).
Try the idea
The complaint driving those FITINDEX reviews is really a complaint about honest time. See the difference with your own data: paste a few weeks of weigh-ins into the free weight trend calculator — it runs in your browser, nothing uploads — and look at the raw series on a real axis next to a deliberately slower signal. Day-to-day bounce is variation; the slower line is the direction.
Questions people ask
Are Yolanda, Feelfit, and FITINDEX related?
They share a software lineage. Feelfit and FITINDEX appear under different seller names, Global eFit and PANATRADE, but their Android builds ship under the package names com.qingniu.feelfit and com.qingniu.fitindex, and Yolanda is sold by Shenzhen QingNiu Software. Their listings describe Apple Health sync in near-identical sentences. We have not found a source that names one maker.
Which app goes with a generic QN-Scale?
One owner's report on the openScale project's issue tracker describes connecting a "QN-Scale from Yolanda". That is an owner's account, not vendor confirmation, so check the manual or QR code that came with your scale.
How do I turn on Apple Health sync for FITINDEX, Feelfit, or Yolanda?
Each app asks about HealthKit when you log in or register; accept, and grant the iOS permission sheet. If you declined earlier, go to Settings, Health, Data Access & Devices, the app's name, and turn write access on, or in the Health app tap your profile picture, then Apps.
What can ABYON owners do now that the ABYON app is gone?
ABYON's former App Store and Google Play listings returned not found on October 18, 2026. In a community thread, one owner recommends Feelfit and two say they connected their ABYON scales to it; one says Feelfit syncs with Apple Health. These are owner reports, since Feelfit's listing does not mention ABYON. Another owner reports Feelfit cannot access the old ABYON app's data, and one says they lost almost five years of readings. Check Apple Health before assuming the old history never synced.
My FITINDEX isn't syncing to Apple Health. What do I try?
FITINDEX's manual for the FT-24D, ES-26M, ES-26M-B, FT-26H-B, and FT-26BB-B says to reconnect the scale (in the app, tap "+", then Device Management, swipe the scale left to delete it, and connect it again), then run Bluetooth Anomaly Detection in Settings, then delete and reinstall the app. Other models may differ.
Sources
- Yolanda on the App Store (seller: Shenzhen QingNiu Software; HealthKit description)
- Feelfit on the App Store (HealthKit description)
- FITINDEX on the App Store (HealthKit description, chart review themes)
- Feelfit on Google Play (com.qingniu.feelfit package)
- FITINDEX on Google Play (com.qingniu.fitindex package)
- openScale project: QN-Scale support (Yolanda hardware)
- Apple Support Communities: ABYON app gone; owner reports of Feelfit pairing; ~5 years of data lost
- Apple: protecting access to Health data (Data Access & Devices)
- Apple: view your health data on iPhone
- Apple: HealthKit quantity type identifiers
- FITINDEX manual (sync troubleshooting, Apple Health categories)
- Apple Support: manage Health data sources and their order
Trendline is not affiliated with or endorsed by Shenzhen Qingniu, Yolanda, Feelfit, FITINDEX, ABYON, or any scale brand named on this page. Vendor behaviors change; everything above was verified against the linked pages on October 18, 2026, with the ABYON community thread re-read in a browser on that date; owner reports are labeled as such.