How to Manage and Revoke Third-Party App Permissions in Apple Health on iPhone

The Apple Health app on iOS serves as a central clearinghouse for your personal biometric, medical, and fitness telemetry. Whenever you connect third-party smart scales, fitness trackers, nutrition logging apps, or workout platforms like Strava and MyFitnessPal, they request permission to either read your historical metrics or write new health samples into the database. Over time, dormant or uninstalled applications may retain read access to your most intimate health trends.

Regularly auditing and managing these third-party integrations is crucial for maintaining digital privacy and preventing conflicting data points. In this guide, we will walk you through how to review connected apps, fine-tune read and write permissions, inspect data sources by health metric, and purge lingering records left behind by disused fitness software.

Understanding Read vs Write Permissions in Apple Health

When an application links to Apple Health, iOS separates its permissions into two distinct categories:

• Allow [App] to Write Data: Permits the third-party app to save measurements (such as calories consumed, cycling workouts, water intake, or weight) directly into the Health database. This data becomes visible across your Health trends and Apple Watch summaries.
• Allow [App] to Read Data: Permits the application to view measurements captured by other devices, such as resting heart rate recorded by your Apple Watch or sleep stages tracked by a smart bed sensor.

You do not need to grant all-or-nothing access. You can safely allow an app to write your running distance while strictly prohibiting it from reading your heart rate or reproductive health records.

Step 1: View and Audit All Connected Apps in Apple Health

You can review every third-party service connected to your Health ecosystem directly within the Health app:

1. Open the Health app on your iPhone.
2. Tap your Profile Icon or avatar in the top-right corner of the screen.
3. Under the Privacy section, tap Apps and Services.
4. You will see a comprehensive list of all installed applications that have requested access to Apple Health.
5. Tap any application in the list to inspect its individual data permissions.

Step 2: Customise Granular Health Permissions for a Specific App

Once you select an application, you can adjust its read and write privileges item by item:

1. Review the toggles listed under Allow [App] to Write and Allow [App] to Read.
2. Toggle off individual categories you no longer wish to share (for example, turn off Heart Rate or Walking + Running Distance while leaving Workouts enabled).
3. If you want to cut ties with the application entirely without deleting your historical workouts, tap Turn Off All Categories at the top.

Step 3: Audit Permissions by Health Category

If you want to approach your privacy audit from the opposite angle—checking every application that can read your Heart Rate or Sleep Analysis—you can review access by data metric:

1. In the Health app, tap the Browse tab at the bottom-right.
2. Select a category (such as Heart or Sleep).
3. Select a specific metric (for example, Resting Heart Rate).
4. Scroll down to the bottom of the metric screen and tap Data Sources & Access.
5. The upper section shows all applications allowed to read this metric, while the lower section lists devices and apps permitted to write data points.
6. Tap Edit in the top-right corner to reorganise data priority or remove write permissions instantly.

Managing Data Source Priority and Resolving Duplicates

If you track runs using both an Apple Watch and a third-party GPS watch or fitness strap, both devices may log identical workouts, leading to duplicated calorie and distance counts. You can instruct Apple Health which hardware takes precedence:

1. Navigate to Browse > Activity > Workouts.
2. Scroll down and tap Data Sources & Access.
3. Tap Edit in the upper-right corner.
4. Under Data Sources, touch and hold the three horizontal lines next to a device and drag it higher or lower in the list.
5. Apple Health prioritises the top device in the list when resolving duplicate timestamps.

How to Delete Data Recorded by a Third-Party App

Revoking an app’s permissions prevents future data collection, but historical logs written by that app remain in your database. If an app logged erroneous or unwanted numbers, you can delete its historical entries without affecting data logged by your Apple Watch:

1. Open Health > tap your Profile Icon > Apps and Services.
2. Select the application you want to cleanse.
3. Tap Data from [App] near the bottom of the screen.
4. You will see a list of every metric the app has ever written.
5. To wipe all historical entries contributed by this app, tap Delete All Data from [App] and confirm when prompted.

Essential Privacy Practices for Health Telemetry

To safeguard your health data as you try new apps and wearable accessories, follow these security practices:

• Uninstalling an App Does Not Erase Stored Data: Deleting a third-party app from your iPhone does not delete the health entries it previously wrote to your Health app. Always purge unwanted records via Apps and Services before uninstalling the app.
• Be Wary of Social Fitness Apps: Certain community workout platforms automatically make uploaded workouts visible to public leaderboards. Ensure in-app privacy settings are configured to private if you log GPS routes starting or ending at your home address.
• Utilise End-to-End Encryption: Ensure Health is toggled on in your iCloud settings with two-factor authentication enabled. This guarantees your health metrics remain encrypted end-to-end and inaccessible even to Apple.