eufy scales sync to Apple Health through the eufy Life app, under two rules: eufy states that only the main user's readings sync, and on the Bluetooth-only C20 the app has to be open when you weigh in (per 9to5Mac's review). Per the app's App Store disclosure, weight, body fat percentage, BMI, lean body mass, and height are written.
Trendline is an iPhone app that reads Apple Health. This page covers getting eufy readings into Health; why Health is the right destination at all is its own page.
How to turn the sync on
The switch lives in the eufy Life app: open the Me page, scroll down, and choose to connect to Apple Health (eufy's support article, iOS steps). The article no longer carries a model-by-model compatibility list, so check your scale's own page if you are unsure. iOS will show the standard Health permission sheet; grant the categories you want written.
Per the app's own App Store disclosure, eufy Life synchronizes five measurement types to Apple Health after each weigh-in: weight, body fat percentage, BMI, lean body mass, and height (eufy Life App Store listing, checked October 2026). Body water and visceral fat stay in the eufy app, because Apple Health has no type for those metrics. Apple Health does have a waist circumference type, but the eufy Life listing does not name it among the types it writes.
The open-app catch
On the Bluetooth-only C20, the reading reaches your iPhone only while the eufy Life app is open. Reviewing that scale in October 2025, 9to5Mac put it plainly: "data is only sent to the iPhone when the Eufy app is open" and you step on the scale (9to5Mac). The same review notes the scale has onboard memory and, when you next step on with the phone present, syncs the stored history — so readings taken with your phone in another room aren't lost, but they don't appear in Apple Health until you open the app near the scale again. We read this as a C20 finding, not a rule for every eufy model.
Practical habit on the C20: open eufy Life before you step on. In 9to5Mac's test, the weigh-in was logged in eufy Life almost instantly and then sent on to Apple Health.
Wi-Fi-capable models (such as the P3) may behave differently, since they can upload without a phone in the room — we have not verified their Apple Health timing and won't claim it here.
One user leaves; the family stays
eufy's support documentation states the second rule directly: "only the data under the main user can be synced to these apps" (same article, which words it as "main user"). Family members' weigh-ins stay inside the eufy app — they never reach Apple Health from a shared account. The article suggests that each person register their own EufyLife account so it can sync with Apple Health; one account per phone is our reading of how that works in practice. If a family member's readings have been silently missing from their Health app, this is the documented reason.
Anyone whose readings can't make the trip can still add a reading to Apple Health by hand — Apple Health keeps manual entries as their own source and, by default, ranks them above data from apps and Bluetooth devices.
eufy scale not syncing to Apple Health? The vendor's own fix
eufy publishes a reset procedure for a paired scale whose measurements stop arriving in Health: open your Apple Health connection settings, turn off all the categories to disconnect it from your eufy account, then reconnect (eufy's troubleshooting article). If that doesn't restore the flow, the article asks you to contact support with a short video of the failure.
Disconnecting and reconnecting changes eufy Life's Health permissions. Neither eufy nor Apple says what it does to samples eufy already wrote, so check your history in Health afterward.
What lands where
| What eufy Life writes to Apple Health | What Apple Health can store | What Trendline reads from Health |
|---|---|---|
| Weight, body fat %, BMI, lean body mass, height (App Store listing, 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 manual entries for the composition values Apple Health has no type for — the body water and visceral fat numbers that currently live only in the eufy app.
Try the idea
Once a few weeks of weigh-ins are flowing, the raw series will bounce — that's variation, not a broken scale. Paste your readings into the free weight trend calculator and compare them against a deliberately slower signal; the direction underneath is the number worth watching.
Questions people ask
How do I connect my eufy scale to Apple Health?
In the eufy Life app, open the Me page, scroll down, and choose to connect to Apple Health, then grant the categories you want on the iOS Health permission sheet (eufy's support article).
Why isn't my eufy scale syncing to Apple Health?
On the Bluetooth-only C20, 9to5Mac found the reading reaches your iPhone only while the eufy Life app is open, so open eufy Life before you step on. The scale keeps weigh-ins in memory and syncs the stored history when you next step on with the phone present. First try the reset in eufy's troubleshooting article: turn off all the categories in your Apple Health connection, then reconnect.
Why are my family's weigh-ins missing from Apple Health?
eufy's support documentation states that only the data under the main user can be synced. eufy suggests each person register their own EufyLife account.
What does eufy write to Apple Health?
Per the eufy Life App Store disclosure, five measurement types: weight, body fat percentage, BMI, lean body mass, and height. Body water and visceral fat stay in the eufy app because Apple Health has no type for those metrics.
How do I reset the eufy Apple Health connection?
eufy's troubleshooting article says to open your Apple Health connection settings, turn off all the categories to disconnect it from your eufy account, then reconnect. If that doesn't restore the flow, the article asks you to contact support with a short video of the failure.
Sources
- eufy support: syncing with Apple Health, Google Fit, and Fitbit (enable path, main-user rule)
- eufy support: what to do if the app doesn't sync with Apple Health (disconnect/reconnect fix)
- Apple: manage Health data on your iPhone (source priority)
- 9to5Mac (Oct 2025): logging weight to Apple Health with a eufy smart scale (C20 open-app requirement)
- eufy Life on the App Store (HealthKit data types)
Trendline is not affiliated with or endorsed by eufy or Anker Innovations. Vendor behaviors change; everything above was verified against the linked pages on July 20, 2026 and re-checked on October 18, 2026. The two earlier eufy support links were retired, so they were replaced with eufy's current support articles.