Privacy Policy
Effective date: 2026-04-18
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 first: all video analysis runs locally on your device. No video leaves your phone unless you explicitly enable sharing or export.
- Data sharing is optional: the "Share with Stride" feature sends analysis results and cropped videos to our servers for research. It is enabled by default but you can turn it off at any time in the app.
- We do not sell your data.
- 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 — when "Share with Stride" is enabled
When this feature is active (default: on), the following data is sent to our servers after each analysis:
- Analysis results: gait metrics (asymmetry values for head, withers, pelvis), cranial/caudal phase data, limb angles, trot frequency, motion type, stride count, duration.
- Horse and owner name as entered by you in the app.
- Veterinary, farrier, physio, and training notes you have attached to the analysis.
- Cropped video recording (uploaded only over WiFi).
- Device information: 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.
How to disable: go to Quick Settings → Data Sharing → Share with Stride and turn the toggle off. No data will be sent until you re-enable it. Previously sent data remains on our servers; contact us if you want it deleted.
2.4 Data we do NOT collect
- Your name, email, or Apple ID (unless you contact us directly).
- 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)
| Data | Purpose | Legal basis |
|---|
| Anonymous ID, device info | Associate analyses, debug issues | Legitimate interest |
| Analysis results, video, notes | Research, algorithm improvement, quality assurance | Legitimate interest (opt-out available) |
| Subscription status | Unlock paid features | Contract performance |
| Crash reports | Fix bugs, improve stability | Legitimate interest |
| Server logs | Security, abuse prevention | Legitimate interest |
| Waitlist email | Notify about product updates | Consent |
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. Videos are uploaded only over WiFi to avoid unintended cellular data usage. 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.
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
Data Controller: Dr Quentin Pleyers
Vollsjö, Sweden
info@stride.ac
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