Privacy Policy
Last Updated: December 27, 2025
This privacy policy applies to the following iOS applications developed by Collapsing Wave Functions:
We do not collect, store, or share any personal data. All app data remains on your device.
Data Collection
What We Don't Collect
- No personal information
- No usage analytics
- No crash reports sent to us
- No advertising identifiers
- No location data
- No device identifiers
What Stays On Your Device
All data created or used by our apps remains exclusively on your device or your personal iCloud account:
| App | Local Data |
|---|---|
| BookM@rk | Book collection, reading progress, scanned documents |
| SwipeSort | Folder configurations, custom reminders with images |
| StickiesToReminders | No persistent storage (converts to iOS Reminders) |
| Multi Timer | Timer configurations and presets |
Permissions
Our apps request only the permissions necessary for core functionality:
BookM@rk
- Camera: Barcode scanning for ISBN lookup
- Microphone: Voice-enabled progress tracking
- Photo Library: Document scanning and storage
SwipeSort
- Photo Library: Access photos for organization
- Files/iCloud: Save photos to your chosen folders
StickiesToReminders
- Camera: Scan physical sticky notes
- Reminders: Create reminders from scanned text
Multi Timer and Countdown
- Notifications: Alert when timers complete
Third-Party Services
BookM@rk Only
BookM@rk connects to public book databases to retrieve metadata (title, author, cover image) when you scan a barcode:
- Open Library (openlibrary.org) - Open source book database
- Google Books API (books.google.com) - Book metadata service
These services receive only the ISBN number you scan. No personal information is transmitted.
All other apps have zero network connectivity.
Data Storage
- All data is stored locally on your device
- If you use iCloud backup, your app data may be included in your encrypted backup
- We have no access to your iCloud backups
Children's Privacy
Our apps do not collect any personal information from anyone, including children under 13.
Changes to This Policy
We may update this privacy policy from time to time. Any changes will be posted on this page with an updated revision date.
Contact
Collapsing Wave Functions
Email: privacy@collapsingwavefunctions.com
Website: collapsingwavefunctions.com
Your Rights
Since we don't collect any data, there is no personal data to access, correct, or delete. All your data is under your control on your device.
This privacy policy is effective as of December 27, 2025.