Check which Renpho app you use: the original, "Renpho - Outdated Version", can no longer register data, and the current app is RENPHO Health. Its App Store listing gives two HealthKit lists that disagree, so after connecting, check Health under your profile, Apps for what it requests. Body fat percentage and BMI appear in both.
Trendline is an iPhone app that reads Apple Health. Everything below assumes an iPhone; the destination for your readings is Apple Health, which Android does not run.
First: make sure you're in the right Renpho app
There are two Renpho apps on the App Store, and the difference matters more than anything else on this page. The original app is now literally named "Renpho - Outdated Version" — its listing says it can no longer register data and asks users to switch. The current app is RENPHO Health (a separate listing, from developer Joicom corporation). If your weigh-ins stopped appearing anywhere, or Apple Health shows a Renpho source that went quiet, check which app icon you've been tapping before you troubleshoot anything else. Both listings were live and read as described on the review date above.
Renpho's own migration guide covers moving between the two: log in to RENPHO Health with the same email you used in the old app, and your measurement history transfers to your new account automatically (Renpho's sync guide). That transfer is between Renpho accounts — it is a separate question from what reaches Apple Health, which we'll get to.
What RENPHO Health writes to Apple Health
The HealthKit description on the RENPHO Health App Store listing is not consistent, so we quote both statements. One says that for its smart body scales, "weight, percentage of body fat, fat weight, height, body mass index (BMI), height and resting calorie consumption data will be synchronized to HealthKit". The connection steps further down the same listing say that after authorization "your Body Fat Percentage, Body Mass Index, and Lean Body Mass will be synchronized to Apple Health." Body fat percentage and BMI appear in both. We cannot tell from the listing which of the others the app actually writes, so check Health after you connect: open Health, tap your profile picture, tap Apps, and open RENPHO Health to see what it requests. The rest of the numbers on the scale's readout, such as body water, bone mass, and visceral fat, are not named in either statement, and Apple Health has no body-measurement types for them.
Turning the sync on
Two paths, both ordinary:
- At first login: the listing says that after you install the app and log in successfully for the first time, a pop-up asks whether to allow Renpho Health to access your health data. iOS then shows its standard permission sheet. Grant the categories you want written. If you did not allow it then, use the second path.
- Any time after: Renpho's FAQ documents the Health-app side: open Apple Health, tap your profile icon on the Summary tab, find the privacy section and tap Apps, select the Renpho app, and tap "Turn On All" — or enable just the types you want (Renpho Health App FAQ). The same switches live in iPhone Settings under Apps → Health → Data Access & Devices.
One boundary to state plainly, because no vendor states it for you: Renpho does not document whether past readings transfer to Apple Health when you first grant access, so we claim neither a backfill nor forward-only sync. If your history predates the toggle and it matters to you, check Health after enabling rather than assuming.
The account question, honestly
Renpho's setup instructions say you can register with an email or log in as a Guest if you don't want to register (Renpho Health App FAQ). Renpho's sync guide warns that for Guest Mode in the original Renpho app, the history cannot be transferred and is lost once you uninstall the app or change the device (Renpho's sync guide). We found no equivalent statement about Guest data in RENPHO Health, so assume Guest history is not backed up. Renpho's FAQ says results sync to your account and are backed up to its servers, which we read as applying to registered accounts.
This is where Apple Health helps, whichever you choose. A weigh-in that RENPHO Health has written to Apple Health is stored in Health, not in your Renpho account, and Apple says the information you gather there is under your control and can be deleted by you (Apple Support). Apple's Health data can also sync through iCloud to your other devices. Guest Mode plus Health sync is a legitimately private setup; just know that the in-app history may be the disposable copy and Health is the one you control.
What lands where
| What RENPHO Health writes to Apple Health | What Apple Health can store | What Trendline reads from Health |
|---|---|---|
| Per the App Store listing: body fat % and BMI in both HealthKit statements, plus weight, fat weight, height, and resting calorie consumption in one, and lean body mass in the other. The listing is inconsistent, so check Health after connecting. It names no body water, bone mass, visceral fat, or muscle mass. | Weight, BMI, body fat %, lean body mass, height, waist circumference. No body-measurement types exist for body water, bone mass, or visceral fat. | Weight, body fat %, and lean body mass (height as context). BMI and waist are not imported — BMI is derivable, and neither carries trend information Trendline needs. |
Trendline also accepts manual weight and body-fat entries and clinic-scan reports, which can hold composition values Apple Health has no type for, like visceral fat and body water. Numbers the Health sync does not carry can still sit alongside your trend.
Renpho not syncing to Apple Health? What to try
The measurements pipeline has three links — scale → app → Health — and each fails differently:
- Scale → app: Renpho's FAQ walks the Bluetooth cases: iOS requires per-app Bluetooth permission (Settings → Apps → Renpho Health → Bluetooth), and the vendor's reset sequence is to reset the scale (take one battery out for 5 seconds on battery models, or press the reset button on the back for 5 seconds on rechargeable ones), reboot the phone, forget the device in the app's Device section, and re-pair (FAQ). The scale itself stores up to 20 weigh-ins offline and uploads them on the next connection — so a missed morning usually isn't lost, it's waiting.
- App → Health: re-check the permission switches in Health (profile → Apps) or iPhone Settings. A category toggled off writes nothing.
- Wrong app entirely: if you're still in "Renpho - Outdated Version," no amount of toggling helps — its own listing says it can't register data. Migrate first.
- Signed out: stay signed in to RENPHO Health. Its FAQ says that logging out stops sync to Google Fit, Samsung Health, and Fitbit (the app's 7.9.8 release notes say Google Health replaced Fitbit); it doesn't say whether Apple Health behaves the same, so don't rely on it continuing.
- Two apps writing the same weigh-in: if another app also writes weight to Health, open Health's Weight category, then Data Sources & Access, and check the order. Apple uses that list to prioritize overlapping sources (Apple Support).
Try the idea
Renpho's app does include an export function (FAQ: History → Export data). Paste a few weeks of weigh-ins into the free weight trend calculator — it runs in your browser, nothing uploads — and compare the raw series against a deliberately slower signal. Day-to-day variation is real without being informative; the slower line is the part worth watching.
Questions people ask
Which Renpho app should I use?
RENPHO Health, a separate listing from developer Joicom corporation. The original app is named "Renpho - Outdated Version", and its listing says it can no longer register data and asks users to switch.
How do I move my Renpho history to the new app?
Log in to RENPHO Health with the same email you used in the old app, and your measurement history transfers to your new account automatically (Renpho's sync guide). That transfer is between Renpho accounts, a separate question from what reaches Apple Health.
How do I turn on Apple Health sync for Renpho?
After you install RENPHO Health and log in for the first time, the listing says a pop-up asks whether to allow access to your health data; grant the categories you want. Any time after, open Apple Health, tap your profile icon, tap Apps, select the Renpho app, and tap Turn On All or enable just the types you want (Renpho Health App FAQ).
What happens to my Renpho data in Guest Mode?
Renpho's sync guide says that in the original Renpho app's Guest Mode, history cannot be transferred and is lost if you uninstall the app or change devices. We found no equivalent statement for RENPHO Health, so assume Guest history is not backed up. Renpho's FAQ says results sync to your account and are backed up to its servers.
Why is my Renpho not syncing to Apple Health?
Re-check the permission switches in Health or iPhone Settings, because a category toggled off writes nothing. Make sure you are not still in "Renpho - Outdated Version", whose own listing says it can't register data. A missed weigh-in is usually waiting, since the scale stores up to 20 weigh-ins offline and uploads them on the next connection (Renpho's FAQ).
Sources
- App Store: RENPHO Health (HealthKit description)
- App Store: Renpho - Outdated Version
- Renpho: FAQ for the Renpho Health App
- Renpho: "Can't Sync Your Data to the Renpho Health App? Here's How!"
- Apple: view your health data on iPhone
- Renpho: FAQ (logging out stops third-party sync)
- Apple Support: manage Health data sources and their order
Trendline is not affiliated with or endorsed by Renpho. Vendor behaviors change; this page states what was verifiable against the sources above on October 18, 2026.