Wearable API Coverage Matrix

This guide gives an overview of data type support across the integrated wearable providers. Use this matrix to understand what data you can expect when integrating with specific devices.

Quick Overview

Capability	Apple	Garmin	Polar	Suunto	Oura	Whoop	Ultrahuman	Strava	Fitbit	Health Connect
OAuth	❌	✅	✅	✅	✅	✅	✅	✅	✅	❌
Workouts	✅	✅	✅	✅	✅	✅	❌	✅	✅	✅
Sleep	✅	✅	✅	✅	✅	✅	✅	❌	🔜	✅
24/7 Data	✅	✅	✅	✅	✅	◐	✅	❌	🔜	✅
Timeseries	✅	✅	✅	✅	✅	❌	✅	◐	🔜	✅
Health Scores	❌	✅	✅	❌	✅	✅	❌	❌	❌	❌
Women’s Health	🔜	✅	❌	❌	❌	❌	❌	❌	❌	🔜

Legend

✅ Full support — Fully implemented and collecting data
◐ Partial — Limited data or only during certain contexts (e.g., workouts only)
🔜 Coming soon — Provider API supports this, processing not yet implemented
❌ Not available — Provider doesn’t support this or not applicable

Timeseries = Granular, timestamped data points (heart rate samples, step counts, HRV readings) available via the /timeseries API endpoint.24/7 Data = Continuous health monitoring throughout the day (not just during workouts), including resting heart rate, HRV during sleep, SpO2 spot checks, and daily activity samples.

Detailed Coverage Matrix

Heart & Cardiovascular

Metric	Unit	Apple	Fitbit	Garmin	Google	Oura	Polar	Samsung	Strava	Suunto	Ultrahuman	Whoop
`heart_rate`	bpm	✅	❌	✅	✅	✅	✅	✅	✅	✅	✅	❌
`heart_rate_recovery_one_minute`	bpm	✅	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌
`heart_rate_variability_rmssd`	ms	❌	❌	✅	✅	✅	✅	✅	❌	✅	❌	✅
`heart_rate_variability_sdnn`	ms	✅	❌	✅	❌	❌	❌	❌	❌	❌	✅	❌
`resting_heart_rate`	bpm	✅	❌	✅	✅	✅	❌	✅	❌	✅	❌	✅
`walking_heart_rate_average`	bpm	✅	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌

Blood & Respiratory

Metric	Unit	Apple	Fitbit	Garmin	Google	Oura	Polar	Samsung	Strava	Suunto	Ultrahuman	Whoop
`blood_alcohol_content`	mg_dl	✅	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌
`blood_glucose`	mg_dl	✅	❌	❌	✅	❌	❌	✅	❌	❌	❌	❌
`blood_pressure_diastolic`	mmHg	✅	❌	✅	✅	❌	❌	✅	❌	❌	❌	❌
`blood_pressure_systolic`	mmHg	✅	❌	✅	✅	❌	❌	✅	❌	❌	❌	❌
`breathing_disturbance_index`	score	❌	❌	❌	❌	✅	❌	❌	❌	❌	❌	❌
`forced_expiratory_volume_1`	liters	✅	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌
`forced_vital_capacity`	liters	✅	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌
`oxygen_saturation`	percent	✅	❌	✅	✅	✅	✅	✅	❌	✅	❌	✅
`peak_expiratory_flow_rate`	L/min	✅	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌
`peripheral_perfusion_index`	score	✅	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌
`respiratory_rate`	brpm	✅	❌	✅	✅	✅	❌	✅	❌	❌	❌	❌
`sleeping_breathing_disturbances`	count	✅	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌

Body Composition

Metric	Unit	Apple	Fitbit	Garmin	Google	Oura	Polar	Samsung	Strava	Suunto	Ultrahuman	Whoop
`body_fat_mass`	kg	❌	❌	❌	✅	❌	❌	✅	❌	❌	❌	❌
`body_fat_percentage`	percent	✅	❌	✅	✅	❌	❌	✅	❌	❌	❌	❌
`body_mass_index`	kg_m2	✅	❌	✅	✅	❌	❌	✅	❌	❌	❌	❌
`body_temperature`	celsius	✅	❌	❌	✅	❌	✅	✅	❌	❌	✅	❌
`height`	cm	✅	❌	❌	✅	✅	❌	✅	❌	❌	❌	✅
`lean_body_mass`	kg	✅	❌	❌	✅	❌	❌	✅	❌	❌	❌	❌
`skeletal_muscle_mass`	kg	❌	❌	✅	✅	❌	❌	✅	❌	❌	❌	❌
`skin_temperature`	celsius	❌	❌	✅	❌	❌	✅	❌	❌	❌	❌	✅
`skin_temperature_deviation`	celsius	❌	❌	❌	❌	✅	✅	❌	❌	❌	❌	❌
`skin_temperature_trend_deviation`	celsius	❌	❌	❌	❌	✅	❌	❌	❌	❌	❌	❌
`waist_circumference`	cm	✅	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌
`weight`	kg	✅	❌	✅	✅	✅	❌	✅	❌	❌	❌	✅

Fitness Metrics

Metric	Unit	Apple	Fitbit	Garmin	Google	Oura	Polar	Samsung	Strava	Suunto	Ultrahuman	Whoop
`cardiovascular_age`	years	❌	❌	❌	❌	✅	❌	❌	❌	❌	❌	❌
`six_minute_walk_test_distance`	meters	✅	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌
`vo2_max`	ml_kg_min	✅	❌	✅	✅	✅	❌	✅	❌	❌	✅	❌

Activity - Basic

Metric	Unit	Apple	Fitbit	Garmin	Google	Oura	Polar	Samsung	Strava	Suunto	Ultrahuman	Whoop
`active_time`	minutes	❌	❌	✅	❌	✅	✅	❌	❌	❌	✅	❌
`average_met`	met	✅	❌	❌	✅	❌	❌	✅	❌	❌	❌	❌
`basal_energy`	kcal	✅	❌	❌	✅	❌	❌	✅	❌	❌	❌	❌
`energy`	kcal	✅	❌	✅	✅	✅	✅	✅	❌	✅	❌	❌
`exercise_time`	minutes	✅	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌
`flights_climbed`	count	✅	❌	✅	✅	❌	❌	✅	❌	❌	❌	❌
`physical_effort`	score	✅	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌
`stand_time`	minutes	✅	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌
`steps`	count	✅	❌	✅	✅	✅	✅	✅	❌	✅	✅	❌

Activity - Distance

Metric	Unit	Apple	Fitbit	Garmin	Google	Oura	Polar	Samsung	Strava	Suunto	Ultrahuman	Whoop
`distance_cycling`	meters	✅	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌
`distance_downhill_snow_sports`	meters	✅	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌
`distance_other`	meters	✅	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌
`distance_swimming`	meters	✅	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌
`distance_walking_running`	meters	✅	❌	✅	✅	✅	✅	✅	❌	❌	❌	❌

Activity - Walking

Metric	Unit	Apple	Fitbit	Garmin	Google	Oura	Polar	Samsung	Strava	Suunto	Ultrahuman	Whoop
`stair_ascent_speed`	m_per_s	✅	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌
`stair_descent_speed`	m_per_s	✅	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌
`walking_asymmetry_percentage`	percent	✅	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌
`walking_double_support_percentage`	percent	✅	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌
`walking_speed`	m_per_s	✅	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌
`walking_steadiness`	percent	✅	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌
`walking_step_length`	cm	✅	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌

Activity - Running

Metric	Unit	Apple	Fitbit	Garmin	Google	Oura	Polar	Samsung	Strava	Suunto	Ultrahuman	Whoop
`running_ground_contact_time`	ms	✅	❌	❌	✅	❌	❌	✅	❌	❌	❌	❌
`running_power`	watts	✅	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌
`running_speed`	m_per_s	✅	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌
`running_stride_length`	cm	✅	❌	❌	✅	❌	❌	✅	❌	❌	❌	❌
`running_vertical_oscillation`	cm	✅	❌	❌	✅	❌	❌	✅	❌	❌	❌	❌

Activity - Swimming

Metric	Unit	Apple	Fitbit	Garmin	Google	Oura	Polar	Samsung	Strava	Suunto	Ultrahuman	Whoop
`swimming_stroke_count`	count	✅	❌	❌	✅	❌	❌	✅	❌	❌	❌	❌

Activity - Generic

Metric	Unit	Apple	Fitbit	Garmin	Google	Oura	Polar	Samsung	Strava	Suunto	Ultrahuman	Whoop
`cadence`	rpm	✅	❌	✅	✅	❌	❌	✅	✅	❌	❌	❌
`estimated_workout_effort_score`	score	✅	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌
`power`	watts	✅	❌	✅	✅	❌	❌	✅	✅	❌	❌	❌
`speed`	m_per_s	✅	❌	✅	✅	❌	❌	✅	✅	❌	❌	❌
`workout_effort_score`	score	✅	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌

Environmental

Metric	Unit	Apple	Fitbit	Garmin	Google	Oura	Polar	Samsung	Strava	Suunto	Ultrahuman	Whoop
`air_temperature`	celsius	❌	❌	✅	❌	❌	❌	❌	❌	❌	❌	❌
`elevation`	meters	❌	❌	✅	❌	❌	❌	❌	❌	❌	❌	❌
`environmental_audio_exposure`	dB	✅	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌
`environmental_sound_reduction`	dB	✅	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌
`headphone_audio_exposure`	dB	✅	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌
`inhaler_usage`	count	✅	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌
`latitude`	degrees	❌	❌	✅	❌	❌	❌	❌	❌	❌	❌	❌
`longitude`	degrees	❌	❌	✅	❌	❌	❌	❌	❌	❌	❌	❌
`time_in_daylight`	minutes	✅	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌
`uv_exposure`	count	✅	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌
`water_temperature`	celsius	✅	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌
`weather_humidity`	percent	✅	❌	❌	✅	❌	❌	✅	❌	❌	❌	❌
`weather_temperature`	celsius	✅	❌	❌	✅	❌	❌	✅	❌	❌	❌	❌

Provider-Specific

Metric	Unit	Apple	Fitbit	Garmin	Google	Oura	Polar	Samsung	Strava	Suunto	Ultrahuman	Whoop
`garmin_body_battery`	percent	❌	❌	✅	❌	❌	❌	❌	❌	❌	❌	❌
`garmin_fitness_age`	years	❌	❌	✅	❌	❌	❌	❌	❌	❌	❌	❌
`garmin_stress_level`	score	❌	❌	✅	❌	❌	❌	❌	❌	❌	❌	❌

Other

Metric	Unit	Apple	Fitbit	Garmin	Google	Oura	Polar	Samsung	Strava	Suunto	Ultrahuman	Whoop
`atrial_fibrillation_burden`	count	✅	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌
`electrodermal_activity`	count	✅	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌
`hydration`	mL	❌	❌	❌	✅	❌	❌	✅	❌	❌	❌	❌
`insulin_delivery`	count	✅	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌
`number_of_alcoholic_beverages`	count	✅	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌
`number_of_times_fallen`	count	✅	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌
`push_count`	count	✅	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌

Workout Data Coverage

Field	Apple	Fitbit	Garmin	Google	Oura	Polar	Samsung	Strava	Suunto	Ultrahuman	Whoop
`average_cadence`	✅	❌	✅	✅	❌	❌	✅	❌	❌	❌	❌
`average_speed`	✅	❌	✅	✅	❌	❌	✅	✅	✅	❌	❌
`average_watts`	❌	❌	❌	❌	❌	❌	❌	✅	✅	❌	❌
`distance`	✅	✅	✅	✅	✅	✅	✅	✅	✅	❌	✅
`elev_high`	✅	❌	❌	✅	❌	❌	✅	✅	✅	❌	❌
`elev_low`	✅	❌	❌	✅	❌	❌	✅	✅	✅	❌	❌
`energy_burned`	✅	✅	✅	✅	✅	✅	✅	✅	✅	❌	✅
`heart_rate_avg`	✅	✅	✅	✅	❌	✅	✅	✅	✅	❌	✅
`heart_rate_max`	✅	✅	✅	✅	❌	✅	✅	✅	✅	❌	✅
`heart_rate_min`	✅	✅	✅	✅	❌	❌	✅	❌	✅	❌	❌
`max_speed`	✅	❌	❌	✅	❌	❌	✅	✅	✅	❌	❌
`max_watts`	❌	❌	❌	❌	❌	❌	❌	✅	✅	❌	❌
`moving_time_seconds`	✅	❌	❌	✅	✅	❌	✅	✅	✅	❌	✅
`steps_count`	✅	✅	✅	✅	❌	❌	✅	❌	✅	❌	❌
`total_elevation_gain`	✅	❌	✅	✅	❌	❌	✅	✅	✅	❌	✅

Sleep Data Coverage

Field	Apple	Fitbit	Garmin	Google	Oura	Polar	Samsung	Strava	Suunto	Ultrahuman	Whoop
`is_nap`	✅	❌	✅	✅	✅	❌	✅	❌	✅	✅	✅
`sleep_awake_minutes`	✅	❌	✅	✅	✅	✅	✅	❌	✅	✅	✅
`sleep_deep_minutes`	✅	❌	✅	✅	✅	✅	✅	❌	✅	✅	✅
`sleep_efficiency_score`	✅	❌	✅	✅	✅	❌	✅	❌	✅	✅	✅
`sleep_light_minutes`	✅	❌	✅	✅	✅	✅	✅	❌	✅	✅	✅
`sleep_rem_minutes`	✅	❌	✅	✅	✅	✅	✅	❌	✅	✅	✅
`sleep_stages`	✅	❌	✅	✅	✅	✅	✅	❌	❌	✅	❌
`sleep_time_in_bed_minutes`	✅	❌	✅	✅	✅	✅	✅	❌	✅	✅	✅
`sleep_total_duration_minutes`	✅	❌	✅	✅	✅	✅	✅	❌	✅	✅	✅

Women’s Health Coverage

Field	Apple	Fitbit	Garmin	Google	Oura	Polar	Samsung	Strava	Suunto	Ultrahuman	Whoop
`current_phase`	❌	❌	✅	❌	❌	❌	❌	❌	❌	❌	❌
`current_phase_type`	❌	❌	✅	❌	❌	❌	❌	❌	❌	❌	❌
`cycle_length`	❌	❌	✅	❌	❌	❌	❌	❌	❌	❌	❌
`day_in_cycle`	❌	❌	✅	❌	❌	❌	❌	❌	❌	❌	❌
`days_until_next_phase`	❌	❌	✅	❌	❌	❌	❌	❌	❌	❌	❌
`fertile_window_start`	❌	❌	✅	❌	❌	❌	❌	❌	❌	❌	❌
`has_specified_cycle_length`	❌	❌	✅	❌	❌	❌	❌	❌	❌	❌	❌
`has_specified_period_length`	❌	❌	✅	❌	❌	❌	❌	❌	❌	❌	❌
`is_predicted_cycle`	❌	❌	✅	❌	❌	❌	❌	❌	❌	❌	❌
`last_updated_at`	❌	❌	✅	❌	❌	❌	❌	❌	❌	❌	❌
`length_of_current_phase`	❌	❌	✅	❌	❌	❌	❌	❌	❌	❌	❌
`length_of_fertile_window`	❌	❌	✅	❌	❌	❌	❌	❌	❌	❌	❌
`period_length`	❌	❌	✅	❌	❌	❌	❌	❌	❌	❌	❌
`predicted_cycle_length`	❌	❌	✅	❌	❌	❌	❌	❌	❌	❌	❌
`pregnancy_snapshot`	❌	❌	✅	❌	❌	❌	❌	❌	❌	❌	❌

Health Scores Coverage

Score	Apple	Fitbit	Garmin	Google	Oura	Polar	Samsung	Strava	Suunto	Ultrahuman	Whoop
`activity`	❌	❌	❌	❌	✅	❌	❌	❌	❌	❌	❌
`body_battery`	❌	❌	✅	❌	❌	❌	❌	❌	❌	❌	❌
`readiness`	❌	❌	❌	❌	✅	✅	❌	❌	❌	❌	❌
`recovery`	❌	❌	❌	❌	❌	✅	❌	❌	✅	❌	✅
`sleep`	❌	❌	✅	❌	✅	✅	❌	❌	❌	❌	✅
`strain`	❌	❌	❌	❌	❌	✅	❌	❌	❌	❌	✅
`stress`	❌	❌	✅	❌	❌	❌	❌	❌	❌	❌	❌

Provider Quirks

Key differences and limitations to be aware of when working with each provider:

Apple Health

Integration Method: Push-based via SDK (no OAuth)

Data arrives via client SDK push, not server-to-server sync
Workouts (most metrics), sleep (stages, duration), and 100+ health record types via HealthKit SDK
Most comprehensive data coverage (100+ metric types)
Full sleep processing with stages (deep, light, REM, awake), duration, and time in bed
Sleep biometrics (HR, HRV, SpO2 during sleep) not yet extracted as part of sleep records
Some walking metrics require iPhone in pocket during activity
HRV is measured as SDNN, typically during sleep or rest periods

Garmin

Integration Method: OAuth 2.0 + Webhooks

Webhooks push data for 16 data types: activities, sleep, dailies, epochs, body composition, HRV, stress, respiration, pulse ox, blood pressure, user metrics, skin temperature, health snapshots, activity details, Move IQ, and menstrual cycle tracking
Full sleep processing with stages (deep, light, REM, awake), duration, efficiency score, and heart rate biometrics
Continuous 24/7 timeseries data: heart rate, steps, energy, HRV (RMSSD, overnight sleep window), stress levels, body battery, respiratory rate, SpO2, and more
Body composition from Garmin Index scale: weight, body fat %, BMI
Garmin-specific metrics: stress level, body battery, fitness age, skin temperature
135+ workout type mappings to unified taxonomy
Workout details include distance, calories, avg/max heart rate, elevation gain, and average speed
Backfill orchestration for historical data retrieval (up to 5 years)
Menstrual cycle tracking (MCT): cycle phase, day in cycle, cycle/period length, fertile window, and pregnancy snapshot via the mct webhook type

Polar

Integration Method: OAuth 2.0 (pull + webhook)

Data synced via periodic polling; real-time webhook notifications for exercise, sleep, activity, nightly recharge, and Sleepwise events
Webhooks are notify-only: Polar sends a lightweight event payload, Open Wearables acknowledges immediately and enqueues a targeted sync for the affected data type
Full sleep processing with stages (deep, light, REM, awake), duration, time in bed, and stage timestamps from hypnogram; sleep efficiency not available in the API
Sleep HR timeseries saved from per-night heart rate samples (not summarised avg/min on the sleep record)
Continuous 24/7 heart rate sampled at ~5-min intervals via range endpoint (90-day lookback)
Daily activity: steps, active calories, and walking/running distance from /v3/users/activities
Health scores: sleep score, Nightly Recharge (recovery), Cardio Load (strain)
Sleepwise Alertness and Circadian Bedtime scores require an active Polar Sleepwise subscription
Body temperature, sleep skin temperature, SpO2, and wrist ECG (HRV RMSSD) require a Polar Elixir device
HRV RMSSD available from Elixir SpO2 spot tests and wrist ECG measurements; not available from standard devices; SDNN not provided
75+ workout type mappings to unified taxonomy
Exercises fetched from /v3/exercises (all exercises in Polar Flow for the connected user; no date filter)

Suunto

Integration Method: OAuth 2.0 + 24/7 Data API

Most complete cloud-based provider (workouts + sleep + continuous data)
Full sleep analysis with stages and biometrics (HR, HRV, SpO2)
Activity samples include heart rate, steps, SpO2, energy, and HRV
HRV measured as RMSSD, available during activity and sleep
Daily activity statistics for aggregated steps and energy
121+ workout type mappings to unified taxonomy
Recovery data: Balance score (0-100) mapped to recovery_score

Oura

Integration Method: OAuth 2.0 + Webhooks

Webhooks push real-time notifications for: daily activity, daily readiness, daily sleep, daily SpO2, and workouts
Full sleep processing with stages (deep, light, REM, awake), duration, time in bed, efficiency score, stage timestamps, and nap detection
Sleep biometrics: lowest heart rate persisted as a daily resting_heart_rate sample and average breathing rate persisted as respiratory_rate; average HR and average HRV are available from the API but not yet persisted per sleep record
Continuous 24/7 timeseries: heart rate (5-min intervals), HRV (RMSSD, 5-min intervals), daily SpO2, steps, active calories, walking distance
Recovery data from daily readiness: recovery score, skin temperature deviation, and skin temperature trend deviation
Fitness metrics: VO2 max (daily estimate) and cardiovascular age — both require the heart_health OAuth scope
Personal info sync: height and weight from user profile
Oura does not expose heart rate data during workouts via API; workout records include only duration, type, calories, and distance
temperature_deviation and temperature_trend_deviation reflect skin temperature relative to baseline (not absolute body temperature)
Backfill defaults to 30 days when no date range is specified

Whoop

Integration Method: OAuth 2.0 (pull + webhook)

Data synced via periodic polling (default: every hour) and real-time webhook notifications for workout, sleep, and recovery events
Full workout support with 145+ workout type mappings to unified taxonomy
Workout metrics include: avg/max heart rate, calories, distance, elevation gain, moving time
Continuous heart rate data is not available via API (only during workouts)
Does not track steps (device limitation)
Sleep data fully implemented with all stages and efficiency
Recovery data fully implemented: recovery score, resting heart rate, HRV (RMSSD), SpO2, skin temperature
Body measurements (height, weight) synced from user profile
Strain scores available but not yet implemented

Ultrahuman

Integration Method: OAuth 2.0 (pull-based polling)

Data synced via periodic polling (default: every hour); Ultrahuman does not support webhooks
Daily metrics endpoint returns all data types for a single day: sleep, HR, HRV, skin temperature, steps, VO2 max, recovery indices
Full sleep processing with stages (deep, light, REM, awake), duration, time in bed, and efficiency score
Continuous 24/7 timeseries: heart rate, HRV (SDNN), skin temperature, steps
VO2 max as a daily aggregate value
Recovery metrics (recovery index, movement index, metabolic score) are normalized but not yet persisted
No workout/activity data available via the Partnership API
Skin temperature values are typically lower than core body temperature (~29-37°C)
Backfill defaults to 30 days when no date range is specified

Strava

Integration Method: OAuth 2.0 + Webhooks

Activity/workout platform only — no sleep, HRV, or continuous health data
Real-time webhook notifications for new and updated activities
50+ sport type mappings to unified taxonomy (SportType) plus legacy ActivityType support
Workout metrics include: avg/max heart rate, distance, avg/max speed, avg/max watts, elevation (gain/high/low), calories, moving time, device name
Per-sample workout streams (heart rate, speed, cadence, power) ingested as /timeseries data when ingest_workout_samples is enabled — scoped to workouts only, not continuous 24/7
Calories fall back to kilojoules when calorie data is not available from the API
Only one webhook subscription allowed per application
Webhook must respond with HTTP 200 within 2 seconds; retries up to 3 times on failure

Fitbit

Integration Method: OAuth 2.0 with PKCE (pull-based polling)

Data synced via periodic polling only; the Fitbit Subscriptions API (webhooks) is not yet implemented
Workout/activity data only today, fetched from the Activities List API with pagination; backfill defaults to 30 days
Workout metrics populated: avg heart rate, calories, distance, steps, and device name; min/max heart rate, speed, and elevation are offered by the API but not yet processed; power is not available
Workout distance is currently stored as the raw kilometer value from the API; conversion to the platform meter unit is pending
Sleep, intraday heart rate, HRV, SpO2, breathing rate, skin temperature, and body measurements are available in the Fitbit Web API but processing is not yet implemented
Intraday timeseries requires a Fitbit “Personal” app type or Fitbit approval for server applications
14 activity type ID mappings plus 25 name-based fallbacks to the unified taxonomy; unrecognized activities map to “other”

Google Health Connect

Integration Method: Push-based via Android SDK (no OAuth)

25+ Health Connect record types mapped to unified series: heart rate, resting HR, HRV, SpO2, blood pressure, respiratory rate, body measurements, steps, calories, and distance
Full sleep processing with stages (deep, light, REM, awake), duration, time in bed, efficiency score, and stage timestamps
Workout sessions currently carry duration, type, and start/end times only; heart rate, speed, calorie, and elevation gain aggregates are planned
HRV is measured as RMSSD; SDNN is not available
Body fat percentage arrives already in percent
Blood glucose arrives in mmol/L; values are stored as received until unit conversion ships
Health Connect basal metabolic rate is a kcal/day rate stored into the kcal basal_energy series
All Health Connect distance is stored as distance_walking_running regardless of activity type
No health scores; GPS routes and in-workout sample streams are accepted by the SDK payload but not yet processed

Data Normalization

Open Wearables normalizes all incoming data to consistent units and formats:

Unit Standardization

All data is normalized to these canonical units:

Metric	Unit
Heart rate	`bpm`
HRV	`ms`
Distance	`meters`
Weight	`kg`
Height	`cm`
Temperature	`°C`
Energy	`kcal`
Duration	`seconds`
Speed	`m/s`
Blood glucose	`mg/dL`

Timestamp Handling

All timestamps are normalized to UTC with timezone information preserved when available:

{
  "timestamp": "2025-01-07T14:30:00Z",
  "type": "heart_rate",
  "value": 72,
  "unit": "bpm"
}

Checking User Data Availability

To see what data is available for a specific user, query the connections endpoint:

curl -X GET "https://api.openwearables.com/api/v1/users/{user_id}/connections" \
  -H "X-Open-Wearables-API-Key: YOUR_API_KEY"

Response shows which providers are connected:

[
  {
    "provider": "suunto",
    "status": "active",
    "last_synced_at": "2025-01-07T10:30:00Z"
  },
  {
    "provider": "apple",
    "status": "active",
    "last_synced_at": "2025-01-07T14:22:00Z"
  }
]

Then query the timeseries endpoint to see available data:

curl -X GET "https://api.openwearables.com/api/v1/users/{user_id}/timeseries\
?start_time=2025-01-01T00:00:00Z\
&end_time=2025-01-07T23:59:59Z" \
  -H "X-Open-Wearables-API-Key: YOUR_API_KEY"

​Quick Overview

​Detailed Coverage Matrix

​Heart & Cardiovascular

​Blood & Respiratory

​Body Composition

​Fitness Metrics

​Activity - Basic

​Activity - Distance

​Activity - Walking

​Activity - Running

​Activity - Swimming

​Activity - Generic

​Environmental

​Provider-Specific

​Other

​Workout Data Coverage

​Sleep Data Coverage

​Women’s Health Coverage

​Health Scores Coverage

​Provider Quirks

​Data Normalization

​Unit Standardization

​Timestamp Handling

​Checking User Data Availability

Quick Overview

Detailed Coverage Matrix

Heart & Cardiovascular

Blood & Respiratory

Body Composition

Fitness Metrics

Activity - Basic

Activity - Distance

Activity - Walking

Activity - Running

Activity - Swimming

Activity - Generic

Environmental

Provider-Specific

Other

Workout Data Coverage

Sleep Data Coverage

Women’s Health Coverage

Health Scores Coverage

Provider Quirks

Data Normalization

Unit Standardization

Timestamp Handling

Checking User Data Availability