HealthSync privacy policy.

HealthSync is built around user-controlled Apple Health sync. The app reads selected HealthKit data on-device and sends it only to the destination you configure.

Last updated: June 5, 2026

Contact: contact@megabyte0x.xyz
HealthKit: Read only, with user permission
Website: No Apple Health access
Telemetry: No third-party app analytics

Summary

The important points.

Health data access

HealthSync reads selected Apple Health data only on the iPhone after you grant HealthKit read permission.

Sync destination

Health data leaves the device only when you configure a backend or hosted HealthSync storage and start a sync.

Tokens

Backend, ingest, and agent tokens are saved in Keychain on the device. Hosted backend records keep token hashes, not raw tokens.

Website data

The website stores access-request and support contact details. It does not read Apple Health data.

Information collected

What HealthSync may store or process.

The exact data depends on your settings, selected HealthKit categories, and whether you use your own backend or hosted HealthSync storage.

Apple Health samples you choose to sync, such as steps, heart metrics, sleep, workouts, body metrics, energy, and optional nutrition or water data.
A stable local device identifier, selected data-type settings, HealthKit sync anchors, queued upload batches, sync logs, and app settings stored locally by the iOS app.
Backend URL and auth tokens that you enter or receive from hosted HealthSync setup. Tokens are stored in Keychain on the device.
Hosted HealthSync workspace data when you choose hosted storage, including workspace-scoped metrics, workouts, sync batch metadata, token hashes, and private read-only agent endpoint information.
Website access-request or support details such as name, email address, iOS device, and message content when you submit them.

Use of information

Why this information is used.

To sync selected Apple Health data to the backend destination you choose.
To retry failed uploads, deduplicate HealthKit records, and show sync status inside the app.
To provision hosted HealthSync storage and private read-only agent credentials when you choose that mode.
To respond to support requests, manage access requests, and send product communication related to HealthSync.

Sharing

HealthSync does not sell Apple Health data. The iOS app does not include advertising SDKs, third-party health SDKs, or third-party app analytics.

If you configure your own backend, synced data is sent to that backend under your control. If you choose hosted HealthSync storage, selected data is stored in a workspace scoped to your tokens and made available through private token-protected endpoints.

Website access requests and support messages may be stored in private production storage or sent to the configured support workflow so we can respond.

Retention and control

You control Health permissions and sync setup.

Local queued upload batches are kept so failed syncs can retry. Successful batches are marked uploaded and pruned after 7 days. Failed network or server uploads remain queued until they are retried or local app data is deleted.

Revoke HealthSync Health permissions in iPhone Settings or in the Apple Health app.
Stop syncing by removing the backend token, switching storage mode, or uninstalling the app.
Delete local app data by deleting HealthSync from the iPhone.
Rotate self-hosted backend tokens in your own backend, or refresh hosted agent credentials from the app.
Request hosted workspace deletion or support-record deletion by emailing contact@megabyte0x.xyz.

Limits

Not medical advice.

HealthSync is a data sync utility. It is not a medical device, does not provide medical diagnosis or treatment advice, and should not be used for emergencies.

HealthSync is not intended for children under 13. If you believe a child provided personal information, contact us so it can be removed.

Questions or deletion requests can be sent to contact@megabyte0x.xyz.

Need help with HealthSync?

Use the support page for setup help, troubleshooting, and contact details.

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