Week 36, 2026
Aug 31 – Sep 6, 2026 · generated from the record, not written from memory
Fitness and health APIs, Aug 31 – Sep 6, 2026: 1 graveyard date and 37 new pages.
Follow the weekly RSS feed · the month in one issue: the monthly digest
Shutdowns, deadlines and launches
- · Strava · Dead in the graveyardStrava Club Activities, Club Members and Club Admins endpoints: RemovedSource: Strava V3 API changelog
New on this site
Build Guides (14)
- Bluetooth Power and Cadence Sensors, Duplicate Rides and Power Averaging in Cycling Apps
- Drift-Free Background Interval Timing and Audio Cues Over Music for HIIT Apps
- Offline Maps, Local-First Track Recording and Elevation Gain for Hiking Apps
- Parental Consent, Data Minimization and Tracker-Free Screens for Kids Fitness Apps
- Length Counting, Watch-Only Recording and No Bluetooth Underwater in Swimming Apps
- Multisport Data Models, Deduplicated Imports and Combined Training Load for Triathlon Apps
- On-Device Storage, Encrypted Sync and Irregular-Cycle Prediction for Cycle Tracking Apps
- Ingredient Normalization and Shopping List Generation for Meal Planning Apps
- Background Audio, Interruptions and Lock-Screen Controls for Meditation Apps
- HRV Baselines, the Cold Start and Score Versioning for Recovery Apps
- Accessibility-First Design and Passive Mobility Metrics for Senior Fitness Apps
- Sessions That Cross Midnight and Devices That Disagree in Sleep Tracking Apps
- Anti-Cheat, Double-Counted Steps and Timezone-Safe Day Closes for Step Challenge Apps
- Smoothing Noisy Weigh-Ins and Labeling Calorie Estimates in Weight Loss Apps
Troubleshooting (10)
- HealthKit errorAuthorizationNotDetermined: You Called Before You Asked
- HealthKit errorHealthDataRestricted: An MDM Profile Turned HealthKit Off
- HealthKit errorDatabaseInaccessible: Reads Fail While the Device Is Locked
- HealthKit errorNoData: The Query Ran and Found Nothing
- HealthKit errorNotPermissibleForGuestUserMode: Writes Blocked in a Guest Session
- HealthKit errorHealthDataUnavailable: The Device Does Not Support HealthKit
- HealthKit errorInvalidArgument: Finding the Argument HealthKit Rejected
- HealthKit errorRequiredAuthorizationDenied: Clinical Records Are a Separate Class
- Undocumented HealthKit Errors: Handling a Case Apple Never Described
- HealthKit Workout Session Errors: Four Cases, Two of Them Undocumented
Blog (9)
- 12 of 24 Fitness APIs Have an Approval Gate
- Four Ways an API Says Contact Sales
- 127 of 240 HealthKit Types Are iOS 8.0
- 58 HealthKit Types Apple Never Explains
- The HealthKit Error That Never Fires
- Apple's Newest HealthKit Types Are a Roadmap
- HRV: Apple Watch SDNN vs Health Connect RMSSD
- 'No Data' Means Four Different Things
- The Fitness API Cost Your Users Pay