eufy-sync 1.7.8

Sync Eufy smart scale body composition data to Garmin Connect and Strava

eufy-sync

Syncs body composition from a Eufy smart scale to Garmin Connect, Strava, and Zwift.

macOS only. Needs Python 3.12+ and a terminal.

Sync targets

Target	What syncs	Stability
Garmin Connect	Full body composition: weight, body fat, muscle mass, bone mass, hydration, BMR, visceral fat, metabolic age	Stable
Strava	Weight	Stable
Zwift	Weight	Unofficial, may break

Zwift has no public API. eufy-sync uses a reverse-engineered endpoint that can change with any Zwift release. If it breaks, Garmin and Strava keep syncing.

Why

Eufy scales sync to Apple Health, Fitbit, and Google Fit, but not Garmin, Strava, or Zwift. If you train on any of those, your body comp is stuck in a separate app. This fixes that.

How Garmin login works

Garmin has no official API for writing body composition into Connect. In March 2026 it put Cloudflare in front of its login, which broke the Python libraries that talked to it; garth was deprecated and stays that way.

eufy-sync logs in through python-garminconnect, which gets past Cloudflare without a browser. On first run you enter your Garmin email and password, plus a code if you use two-factor. The tokens save to your keychain and refresh on their own, so later runs need no login. If that direct login gets rate-limited, a Chromium window opens once for you to sign in, then it continues. Headless setups use the direct login only, since there is no screen for a browser.

Install

You need Python 3.12+, a Eufy scale with cloud sync, and a Garmin and/or Strava account.

brew install pipx        # or: pip3 install pipx
pipx install eufy-sync
eufy-sync

First run walks you through choosing targets and entering credentials, then runs the first sync.

Python older than 3.12? The simplest path is uv: uv tool install eufy-sync fetches a compatible Python for you, without touching your system Python. Or brew install python@3.12 then pipx install --python python3.12 eufy-sync.

Cloned the repo? Run pipx commands from outside the repo directory to avoid path conflicts, e.g. cd /tmp && pipx install eufy-sync.

Usage

eufy-sync                      # sync new measurements to all configured targets
eufy-sync --status             # last sync + token health
eufy-sync --dry-run            # preview without uploading
eufy-sync --update             # update to the latest version
eufy-sync --setup-strava       # add Strava
eufy-sync --setup-zwift        # add Zwift
eufy-sync --select-profile     # pick your profile on a shared scale
eufy-sync --reauth [target]    # re-login (all, or garmin / strava / zwift)
eufy-sync --update-password    # change stored passwords
eufy-sync --backfill-days 30   # sync the last 30 days
eufy-sync --verbose            # detailed logs
eufy-sync --install-agent      # turn automatic sync on
eufy-sync --uninstall-agent    # turn automatic sync off
eufy-sync --uninstall          # remove all data and clean up

Updating

eufy-sync checks weekly and tells you when a new version is out. To update:

eufy-sync --update

Automatic sync (macOS)

On first run you can opt into syncing every 4 hours. If you do, a macOS Launch Agent runs it in the background: weigh yourself, open your laptop later, and it syncs on its own. Logs go to ~/.garmin-sync/sync.log, and you get a notification if something fails. Turn it off with eufy-sync --uninstall-agent.

Adding Strava

If Garmin is already set up and you want Strava:

1. Create a Strava API app at https://www.strava.com/settings/api
2. Set "Authorization Callback Domain" to localhost
3. Run eufy-sync --setup-strava and enter your Client ID and Secret
4. Authorize in the browser when it opens

How it works

Eufy Cloud  ->  eufy_client.py  ->  transform  ->  garmin_client.py  ->  Garmin (FIT)
(pull)          (auth)              (filter,    ->  strava_client.py  ->  Strava (weight)
                                    dedup,      ->  zwift_client.py   ->  Zwift  (weight)
                                    state.db)

On each run it pulls your Eufy history and checks a local SQLite DB for what each target already has, then uploads only what is new: a FIT file to Garmin (skipping dates Garmin already holds, so two machines do not double up), and the latest weight to Strava and Zwift. Every sync is recorded in the DB.

Security

Passwords and OAuth tokens live in your macOS Keychain, not plaintext files. The config in ~/.garmin-sync/ holds only email addresses and Strava app credentials, at 600 permissions. Credentials go over HTTPS to Eufy, Garmin, Strava, and Zwift only, and are never logged or sent anywhere else. The one other outbound call is a weekly version check to pypi.org, with no credentials. On a host without a keychain (headless Linux), credentials fall back to a 600 file.

Known quirks

The Eufy cloud reports weight at about 0.05 kg resolution, so it can differ from the Eufy app, which may read Bluetooth at higher precision. Most days match within 0.1 lb; some can be off by up to ~0.5 lb, and the kg-to-lb conversion on Garmin adds a little rounding.

If more than one person uses the same Eufy account, setup asks which profile is yours, so only your weigh-ins sync. Until you choose, a sync that sees several profiles stops and lists them rather than guessing. Set it up before this existed? Run eufy-sync --select-profile once, then eufy-sync --backfill-days 30 to pull any of your weigh-ins an earlier version skipped.

The Eufy cloud only returns a weigh-in after the Eufy app has processed it. If you step on the scale and a sync finds nothing, open the app once so it uploads, then run eufy-sync again. The tool cannot trigger that upload itself, so it shows up most on headless or scheduled setups.

Tests

pytest tests/ -v

Disclaimer

Uses unofficial APIs for Eufy, Garmin, and Zwift, and the official Strava API. Could break if any of them change things. Use at your own risk.