What HealthKit data does Omnio sync?

Omnio reads 16 quantity types from HealthKit including steps, calories, heart rate, HRV (SDNN), SpO2, respiratory rate, weight, body fat, and lean mass, plus sleep stages and workouts with per-activity duration, calories, distance, and average heart rate.

How does HealthKit sync work?

The Omnio iOS app requests HealthKit read permissions during onboarding and syncs in the background when the app wakes up or when you open it. Samples are pushed to the Omnio backend over a secure channel and normalised into the same metric catalog as Oura, Garmin, and WHOOP.

Do I need an Apple Watch?

No. HealthKit collects data from any source that writes to it — iPhone motion sensors, Apple Watch, third-party apps, and connected scales or blood-pressure cuffs. If you have an Apple Watch you'll get richer heart-rate, HRV, and workout data, but it's not required.

What happens if I also connect Oura or Garmin?

Omnio deduplicates overlapping metrics by source. Each device gets its own series so you can compare them, and composite scores pick the most reliable signal for each metric — for example, Oura for sleep stages and Apple Watch for workout heart rate.

Does Omnio write data back to HealthKit?

No, Omnio only reads from HealthKit. We never write samples back, so there's no risk of duplicating or overwriting data in Apple Health.

Is HealthKit data stored on Apple's servers?

HealthKit data lives in the Apple Health database on your iPhone and syncs across your Apple devices via iCloud if you enable it. Omnio only sees the samples you grant permission to, and stores them under your Omnio user account alongside your other sources.

Apple HealthKit

Sync steps, heart rate, HRV, sleep, and workouts from iPhone and Apple Watch

By Mac DeCourcy, Founder & Engineer · Updated April 17, 2026

Overview

Pull 16 quantity types plus sleep stages and workouts directly from Apple HealthKit through the Omnio iOS app. Works with any device that writes to HealthKit — Apple Watch, iPhone motion, third-party apps, and connected scales — so the data you already collect on iOS flows straight into Omnio.

How the integration works

The Omnio iOS app reads directly from Apple HealthKit on your iPhone, requesting granular per-type read permissions during onboarding so you can grant or deny each category individually. Sixteen quantity types plus sleep analysis and workouts are pulled into Omnio: steps, distance, flights climbed, active and resting calories, heart rate with resting and walking variants, HRV (SDNN), SpO2, respiratory rate, weight, body fat percentage, lean mass, BMI, sleep stages and full workout sessions with duration, calories, distance and average heart rate. Sync runs in the foreground when you open the app and in the background when iOS wakes it. Samples are pushed to the Omnio backend over a secure channel and normalised into the same metric catalog as Oura, Garmin and WHOOP. Historical data is available as far back as HealthKit retains it — often years — and no Apple Watch is required because HealthKit also accepts data from iPhone motion sensors and third-party apps.

What Omnio adds on top of Apple HealthKit

Apple Health is a read-optimised aggregator — it collects data beautifully but doesn't analyse it. Omnio's biggest differentiator is the analysis layer it adds on top of the same HealthKit samples: training-load modelling, composite health scoring, adaptive training prescription, correlation discovery across sources, and an AI health assistant that can answer questions like "why was my readiness low on Wednesday?" using your HealthKit data alongside bloodwork, DEXA, supplements or nutrition you've logged elsewhere. Equally important, Omnio stitches HealthKit samples into a single reconciled timeline with data from non-Apple devices — an Oura Ring, a Garmin watch, a Withings scale — which Apple Health cannot do reliably on its own because it only surfaces Apple-ecosystem metrics with confidence. For iPhone users who also wear an Oura, WHOOP or Garmin device, Omnio is the one place where the whole picture actually adds up, instead of living in separate apps.

Metrics We Sync

Steps, distance & flights climbed
Active & resting calories
Heart rate, resting HR & walking HR
HRV (SDNN) & SpO2
Sleep stages (deep, REM, light, awake)
Workouts with duration, calories & HR
Weight, body fat %, lean mass & BMI
Respiratory rate & stand hours

Frequently Asked Questions

What HealthKit data does Omnio sync?: Omnio reads 16 quantity types from HealthKit including steps, calories, heart rate, HRV (SDNN), SpO2, respiratory rate, weight, body fat, and lean mass, plus sleep stages and workouts with per-activity duration, calories, distance, and average heart rate.
How does HealthKit sync work?: The Omnio iOS app requests HealthKit read permissions during onboarding and syncs in the background when the app wakes up or when you open it. Samples are pushed to the Omnio backend over a secure channel and normalised into the same metric catalog as Oura, Garmin, and WHOOP.
Do I need an Apple Watch?: No. HealthKit collects data from any source that writes to it — iPhone motion sensors, Apple Watch, third-party apps, and connected scales or blood-pressure cuffs. If you have an Apple Watch you'll get richer heart-rate, HRV, and workout data, but it's not required.
What happens if I also connect Oura or Garmin?: Omnio deduplicates overlapping metrics by source. Each device gets its own series so you can compare them, and composite scores pick the most reliable signal for each metric — for example, Oura for sleep stages and Apple Watch for workout heart rate.
Does Omnio write data back to HealthKit?: No, Omnio only reads from HealthKit. We never write samples back, so there's no risk of duplicating or overwriting data in Apple Health.
Is HealthKit data stored on Apple's servers?: HealthKit data lives in the Apple Health database on your iPhone and syncs across your Apple devices via iCloud if you enable it. Omnio only sees the samples you grant permission to, and stores them under your Omnio user account alongside your other sources.

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