Privacy Policy

Effective date: 2026-06-07

Stride is operated by Dr Quentin Pleyers ("we", "us"), based in Vollsjö, Sweden. This policy explains what data we collect when you use stride.ac and the Stride mobile app ("App"), why we collect it, how we protect it, and your rights. We comply with the EU General Data Protection Regulation (GDPR) and Apple’s App Store Guidelines.

1. Summary

• On-device analysis: all video analysis runs locally on your device. After analysis, the cropped video, keypoint data and analysis results are uploaded to our servers to improve our models and for research.
• The "Share with Stride" setting controls the level of personal data, not whether data is uploaded. When ON, the horse and owner names and your notes are included. When OFF, the same data is still uploaded but with direct identifiers removed (names, personal number, address, phone) — the owner email and notes are kept, so it is pseudonymised, not fully anonymous.
• We do not sell your data and do not share it with third parties for their own purposes.
• No cross-app tracking: we do not use IDFA, advertising identifiers, or any third-party tracking SDKs.

2. Data we collect

2.1 Website (stride.ac)

• Server logs (legitimate interest): IP address, user-agent, pages visited, timestamp. Retained up to 30 days for security.
• Waitlist form (consent): email address you provide via Google Forms to be notified about updates.

2.2 App — always collected

• Anonymous device identifier: a random UUID generated on first launch, stored locally on the device. Not linked to your Apple ID, name, or email. Used to associate your analyses on our server.
• Subscription status: free, plus, or pro. Received from Apple StoreKit. We do not see payment details.
• Crash diagnostics: standard Apple crash reports if you have enabled "Share with App Developers" in iOS Settings.

2.3 App — uploaded after each analysis

After each analysis the following is uploaded to our servers, over WiFi or cellular:

• Analysis results and movement curves: gait metrics (asymmetry values for head, withers, pelvis), cranial/caudal phase data, limb angles, trot/tölt/walk/gallop metrics, motion type, stride count, duration, and per-stride start/end frame indices.
• Keypoint data (CSV): the per-frame coordinate data derived from the recording.
• Cropped video recording (the processed, zoomed clip; the original full-resolution video is never uploaded).
• Device information: a stable per-device identifier, device model (e.g., iPhone18,1), iOS version, app version, ML model version.
• Country: derived from your device locale setting (not GPS).
• IP address: recorded by the server automatically.

The "Share with Stride" setting (default: on; change any time in Quick Settings → Data Sharing) controls the personal data included:

• Enabled: the horse's and owner's names, and the linked veterinary / farrier / physio / training notes, are included.
• Disabled: the same analysis, keypoint, video and technical data is still uploaded, but with direct identifiers removed — owner and horse name, owner personal number, address and phone. The owner email and the clinical notes are retained (pseudonymisation, not full anonymisation).

Previously uploaded data remains on our servers; contact us if you want it deleted.

2.4 Data we do NOT collect

Note: Stride has no user accounts, so we do not collect your own name, email or Apple ID. However, the horse-owner records you enter (which may include an owner's name, email, phone and address) are personal data about those individuals and are uploaded as described in 2.3 — you are responsible for having a lawful basis to enter and share them.

• Your Apple ID or payment details.
• GPS location or precise geolocation.
• Contacts, photos (other than videos you record within the app), microphone audio (beyond voice commands within the app).
• Advertising identifiers or cross-app tracking data.

3. Purpose and legal basis (GDPR Art. 6)

4. Data sharing and processors

We do not sell your data. We may share data with:

• Hosting provider (Plesk/IIS server in the EU) — stores analysis results and videos.
• Apple — processes payments (StoreKit), delivers crash reports.
• iCloud — if you use the backup feature, your Realm database is stored in your personal iCloud container. We cannot access it.

We do not use any third-party analytics SDKs, advertising networks, or social media trackers.

5. Data retention

• Analysis results and videos: retained indefinitely for research purposes, unless you request deletion.
• Server logs: deleted within 30 days.
• Waitlist emails: kept until you unsubscribe.
• On-device data: stored locally in the Realm database until you delete the app or reset the database.

6. International transfers

Our server is hosted in the EU. Where data is transferred outside the EEA, we rely on adequacy decisions or Standard Contractual Clauses (SCCs).

7. Security

We use HTTPS for all data transfers, access controls on our server, and database authentication. Uploads occur over WiFi or cellular. No system is perfectly secure; contact us immediately if you suspect unauthorized access.

8. Your rights (GDPR)

You have the right to:

• Access your data — contact us and we will provide a copy.
• Rectify inaccurate data.
• Delete your data (“right to be forgotten”).
• Object to processing based on legitimate interest.
• Restrict processing.
• Data portability — export your data in a structured format (the app already supports CSV, PDF, and .stride exports).
• Withdraw consent at any time (for the waitlist or data sharing) without affecting prior lawful processing.
• Lodge a complaint with your local data protection authority (in Sweden: IMY).

To exercise these rights, email info@stride.ac. We will respond within 30 days.

8.1 Deleting your data

You can erase all the data we hold about you at any time:

• In the app (fastest): open Quick Settings → Privacy → “Delete my data”. This permanently removes all your analyses, cropped videos, keypoint data and notes from our servers. Your data on the device itself is kept — you can remove it by deleting the app.
• By email: send your in-app Anonymous ID (shown in Quick Settings → Privacy) to info@stride.ac and we will delete your data within 30 days.

Deletion is permanent and cannot be undone.

9. Children

Stride is not directed to children under 16. We do not knowingly collect data from children.

10. Apple App Store compliance

In accordance with Apple’s App Store Review Guidelines:

• We describe all data collection in the App Store privacy nutrition labels.
• We do not use any form of device fingerprinting or cross-app tracking.
• The "Share with Stride" feature provides a clear opt-out mechanism (toggle in Quick Settings).
• Data collected is used only for the purposes described in this policy.

11. Changes

We may update this policy. We will post changes here and adjust the effective date. For material changes, we will notify you in the app.

12. Contact

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