Privacy Policy
Last updated: September 24, 2026 (iOS / App Store version added)
Effective date: August 21, 2026
App: S.Q.W. — Secrets of Quantum Waves (com.secretsofquantumwaves.app)
S.Q.W. ("the app") regards user privacy as a founding principle. The app runs fully offline: no personal data is collected, no data is sent to any server, and no user data is retained by us. This policy is provided under the EU General Data Protection Regulation (GDPR) and applicable law.
Summary: We collect no data from you. Everything created while using the app stays on your own device, never leaves it, and remains there until you delete it or uninstall the app. Because we hold no user data on any server, there is no retention period on our side.
1. Data Processed
Data stored on your device: Mood preferences, session statistics, achievements, PRO presets,
language selection, onboarding state and GDPR consent state — plus, if you choose to enter them, sky-chart
birth details (date, time, city) and your Shadow Journal notes. All of it is kept solely in your device's local
storage (localStorage / sessionStorage). It is never sent to any server, is excluded
from device and cloud backups (Android: android:allowBackup="false"; iOS: app data is excluded from
iCloud and device backups), and is never seen or accessed by us.
AURA Frequency Guide: AURA is a card system that runs entirely on-device and offline. No message or data is ever sent to the internet, to any AI service, or to any third party.
Not collected: Name, email, phone number, location, IP address, device identifiers, advertising ID, contacts, photos or any other personal identifier. No account or sign-in is required. The app contains no ads, tracking pixels, or third-party analytics/SDKs.
2. Purpose & Legal Basis
Legal basis: explicit consent (GDPR Art. 6(1)(a)). Purpose: remembering your preferences and progress locally on your device only. Your data is never used for profiling, automated decision-making, advertising or marketing. Because the data never leaves your device, no data is transferred to us.
3. Data Retention (Retention Policy)
Server-side retention: NONE. Because the app collects no personal data and transmits no data to any server, no user data is retained by the developer or any third party. There is therefore no server-side retention period, archive, or backup copy held by us.
On-device retention: The following data is stored only on your own device, and its retention is entirely under your control:
| Data type | Where it is stored | Retention period |
|---|---|---|
| Language, theme and mood preferences | Device — localStorage | Until you delete it or uninstall the app |
| Session statistics, streaks and achievements | Device — localStorage | Until you delete it or uninstall the app |
| PRO synth presets | Device — localStorage | Until you delete it or uninstall the app |
| Onboarding and GDPR consent state | Device — localStorage | Until you delete it or uninstall the app |
| Sky-chart birth details (optional) | Device — localStorage | Until you delete it or uninstall the app |
| Shadow Journal notes (optional) | Device — localStorage | Until you delete it or uninstall the app |
| Temporary session state | Device — sessionStorage | Cleared automatically when the app is closed |
No fixed maximum retention period is applied to this data; it simply remains on your device indefinitely until you act. You alone decide how long it is kept, and you can permanently erase all of it at any time.
4. Deleting Your Data
You can permanently delete all S.Q.W. data on your device in any of three ways:
- In the app: Settings → Data Management → "Clear All Data". This immediately and irreversibly erases all local data, including birth details and Shadow Journal notes.
- From device settings: Android → Settings → Apps → S.Q.W. → Storage → "Clear data". iOS → Settings → General → iPhone Storage → S.Q.W. → "Delete App" (removes it together with all its data).
- By uninstalling: Removing the app deletes all data stored on the device.
Deletion happens entirely on your device, so you do not need to contact us, and no copy of the deleted data remains with us. If you nevertheless have a request about our retention or deletion practices, contact us at the address below; requests are answered within 30 days at the latest.
5. Data Security
Because your data never leaves your device, there is no transmission over a network, no server breach and no third-party access risk; there is no server database to protect in the first place.
- Data stored on the device is kept inside the operating system's (Android / iOS) application sandbox; the operating system prevents other apps from accessing it.
- Data is excluded from device and cloud backups (Android:
android:allowBackup="false"; iOS: excluded from iCloud backup), so it cannot leave the device through a backup either. - The app contains no ad networks, analytics or third-party SDKs, so there is no external component that could reach your data.
- The app is distributed through Google Play (Android) and the App Store (iOS) as a signed package whose integrity is verified by the respective store (Google / Apple).
The physical security of the data depends on the security of your device: if your device is lost, stolen or used by unauthorised people, the data on it may be exposed. We therefore recommend using a device lock (PIN, password or biometric authentication).
6. Data Controller & Your Rights
Data Controller: SQW (Google Play and App Store developer account)
Email: secretsofquantumwaves@gmail.com
Under GDPR Art. 15–22 you have the right to know whether your data is processed, to request information and the purpose of processing, and to request rectification or erasure. Because the app collects no data from you, most of these rights can be exercised directly on your device using the deletion options above.
7. Third-Party Services
Because the app runs offline, it contains no third-party data processors, analytics, or ad networks. Fonts are bundled inside the app; no external font or CDN connection is made.
Google Play: The app is distributed through Google Play. Downloads, purchases and the Google Play in-app update feature are handled by Google and are subject to Google's privacy policy: policies.google.com/privacy. The app itself collects no personal data during these operations and never accesses or stores your payment information.
App Store: The iOS version is distributed through the Apple App Store. Downloads, purchases and updates are handled by Apple and are subject to Apple's privacy policy: apple.com/legal/privacy. The in-app rating prompt is shown by Apple's own system. The app itself collects no personal data during these operations and never accesses or stores your payment information.
8. Children's Privacy
The app is not directed at children under 13 and does not knowingly collect data from children.
9. Health & Medical Notice
S.Q.W. is a relaxation, meditation and atmosphere tool; it is not a medical diagnosis, treatment, or a substitute for treatment. Please consult a healthcare professional if you have any health concerns.
10. Changes
This policy may be updated. Changes are published on this page and the "last updated" date above is revised. Significant changes are also announced with an app update.
11. Contact
For any question about privacy, data retention or deletion: secretsofquantumwaves@gmail.com
DOI: 10.5281/zenodo.19221418 | Secrets of Quantum Waves