Stream Weight Gurus data. No Weight Gurus API needed.
Weight Gurus smart scales from Greater Goods write weight, body fat, BMI, and lean mass to Apple Health — and Sahha’s SDK reads them into your app as normalized body-composition biomarkers, alongside every other source.
- On-device
- Apple Health
- iOS
- HIPAA
- GDPR
Free for 30 days · No credit card
- Weight
- 74.1 kg
- Body fat
- 19.4 %
- Lean mass
- 59.7 kg
Identical schema across 500+ sources
Your users connect Weight Gurus. Sahha does the rest.
This is your user’s side of the story — one screen, once. Sahha ingests every Weight Gurus signal, normalizes, deduplicates, and delivers it to your service — raw, or as refined intelligence your product can act on.
A Allow "your app"
On-device and permissioned
Weight Gurus data is read on the user’s own device, only after they grant Apple Health permission — nothing syncs without consent.
One integration, every source
Permission is per data type, not per brand. Anything that writes to Apple Health — Weight Gurus today, a new watch next year — flows through the same SDK with no extra prompt and no new code.
What Weight Gurus syncs through Apple Health.
Request only what you need
You choose exactly which of these signals to request from Apple Health — users are only ever prompted for those, which keeps opt-in rates high.
One schema, every source
Weight Gurus, Apple Watch, and Oura all return the same fields and units.
What crosses the bridge
Weight, body fat, BMI, and lean mass pass through Apple Health; some app-exclusive metrics may not.
Body
4
HealthKitSahha- bodyMassweightkg
- bodyFatPercentagebody_fat%
- bodyMassIndexbody_mass_index
- leanBodyMasslean_masskg
See a real payload
{
"type": "HKQuantityTypeIdentifierBodyMass",
"value": 74.1,
"unit": "kg",
"startDate": "2026-06-02T07:02:00Z",
"sourceRevision": { "source": { "name": "Weight Gurus" } }
// …body fat, BMI & lean mass samples
}[
{
"category": "body",
"type": "weight",
"value": 74.1,
"unit": "kg",
"periodicity": "spot",
"aggregation": "last",
"startDateTime": "2026-06-02T07:02:00Z",
"endDateTime": "2026-06-02T07:02:00Z"
},
{
"category": "body",
"type": "body_fat",
"value": 19.4,
"unit": "percent",
"periodicity": "spot",
"aggregation": "last",
"startDateTime": "2026-06-02T07:02:00Z",
"endDateTime": "2026-06-02T07:02:00Z"
}
// …2 more normalized logs
]Weight Gurus — the smart-scale line from Greater Goods — writes weight, body fat, BMI, and lean mass to Apple Health each time the user steps on the scale. The scale measures a fuller bioimpedance breakdown than Apple Health can represent: Apple Health has no field for fat mass, body water, bone mass or basal metabolic rate, so those readings stay in the Weight Gurus app. One data-quality caveat worth planning for: multi-user scales assign each reading to a profile by weight proximity, so a household sharing one scale can occasionally have a reading land on the wrong profile. Bioimpedance body composition is also an estimate that varies with hydration and time of day, so treat it as a trend rather than an absolute. Health Connect is essentially absent from the smart-scale category, and the Android path here is Google Fit or nothing — so this is an iOS-only integration.
Missing a metric you need? Talk to us in the Sahha Slack — if Weight Gurus captures it, we can usually add support.
Get more than just raw data
Sahha turns these signals into biomarkers, scores, archetypes, and insights — the modeling done for you.
Reading Apple Health yourself? Here’s the to-do list.
Everything on the left is yours to write, test, and maintain on iOS. Everything on the right, Sahha already did.
- Integrate Apple Health.
- Handle iOS version differences.
- Add Health Connect separately for Android.
One SDK covers Apple Health, Health Connect, and every cloud source.
- Write the HealthKit queries.
- Request the right permissions.
- Wire up background delivery.
The SDK handles queries, permissions, and background sync.
- Dedupe apps writing the same metric.
- Map dozens of HealthKit types.
- Reconcile against your Android sources.
Deduped, typed, one schema — one stream per user.
- Build a sleep model.
- Build an activity model.
- Hire a data scientist.
Scores, archetypes, and insights — built in.
- Apple changes a HealthKit API.
- You find out in production.
We version the SDK. You never notice.
No Weight Gurus developer account needed — Sahha reads what Weight Gurus already writes to Apple Health on iOS.
Live in an afternoon, not a sprint.
- # Add the Sahha SDKnpm install sahha-react-native01
Add the Sahha SDK
Drop the Sahha SDK into your iOS app — or React Native or Flutter. The same SDK also covers Health Connect for your Android sources.
- A
Allow “your app”
ConnectSleepActivityHeart rate02Prompt for Apple Health permissions
Call the SDK to show the native Apple Health consent sheet. The user chooses what to share — under your brand. It’s one prompt, ever: permission is per data type, not per brand, so every future source is already covered.
- Your app LIVESleep7h 12mReadiness82Heart rate62 bpm03
Sahha reads and delivers
Once permission is granted, the SDK reads Weight Gurus data from Apple Health in the background, normalizes it to one schema, and streams it to your app by webhook or API.
Most teams read live Weight Gurus data the same day they add the SDK. The only per-source prerequisite: your user has Weight Gurus’s Apple Health sync switched on — most source apps enable it by default.
Route it into your stack.
Sahha streams every update to your webhook — and a step-by-step guide takes it the rest of the way into your database, CDP, or messaging tool.
Weight Gurus integration questions
How does Sahha get Weight Gurus data?
Weight Gurus scales write to Apple Health through the Weight Gurus app, and Sahha reads them from there with its mobile SDK — so you get body-composition data without integrating the Weight Gurus API directly.
Which Weight Gurus metrics does Sahha provide?
Weight, body fat percentage, BMI, and lean body mass — normalized to Sahha’s schema. These are spot readings taken each time the user weighs in. The scale measures a fuller bioimpedance breakdown than Apple Health can represent — Apple Health has no field for fat mass, body water, bone mass or basal metabolic rate, so those readings stay in the Weight Gurus app.
How reliable are Weight Gurus readings in a shared household?
Multi-user scales assign a reading to a profile by weight proximity, so when several people in a household share one scale, a reading can occasionally be attributed to the wrong profile. It’s worth accounting for if you act on sudden jumps in a user’s weight trend. Separately, bioimpedance composition figures are estimates that move with hydration and time of day, so they read best as a trend rather than an absolute.
Does the Weight Gurus integration work on Android?
No. Health Connect is essentially absent from the smart-scale category, and the Weight Gurus Android path is Google Fit or nothing — so this is an iOS-only integration. Your users’ other Android sources still flow through the same Sahha SDK.
Is the Weight Gurus integration HIPAA and GDPR compliant?
Yes. Sahha is HIPAA and GDPR compliant and SOC 2 certified, and Weight Gurus data flows through the same compliant pipeline as every other source.
One API for every other source, too.
Add another wearable or app and the schema, webhooks, and scores are identical — no new pipeline to build.
Start streaming Weight Gurus data today.
Connect once. Sahha handles consent, normalization, and real-time delivery — for Weight Gurus and every other source.
Free for 30 days · No credit card
- One API for Weight Gurus and every other source
- Real-time webhooks + on-demand REST, one normalized schema
- Scores, archetypes & insights — no modeling required
- HIPAA, GDPR & SOC 2 · your brand on the consent screen