Privacy Policy
Sidewall - Cycling Tire Pressure Calculator
Last updated: February 2026
Summary
Sidewall is designed with privacy as a core principle. The app:
- Collects no personal data
- Has no analytics or telemetry
- Makes no network requests except to Apple services (iCloud sync, WeatherKit)
- Uses only your private iCloud for optional sync
Data Collection
We do not collect any data.
Sidewall does not collect, transmit, or share any personal information, usage data, or analytics. The app has no user accounts, no registration, and no external backend.
Data Storage
All data you enter in Sidewall is stored locally on your device:
- Rider weight and preferences
- Bike profiles
- Wheel and tire setups
- Calculation history
This data never leaves your device unless you enable iCloud sync.
iCloud Sync
If you use iCloud sync, your data is stored in your private iCloud database using Apple's CloudKit framework. This means:
- Only you can access your data
- Data is encrypted in transit and at rest
- Apple manages the infrastructure, but cannot read your data
- No third parties have access
- Sidewall has no server-side access to your synced data
You can disable iCloud sync at any time in your device settings. The app functions fully offline.
Third-Party Services
Sidewall uses no third-party services:
- No analytics (no Google Analytics, Firebase, Mixpanel, etc.)
- No crash reporting services
- No advertising networks
- No social media integrations
- No external APIs
Network Activity
Sidewall makes no network requests except for:
- iCloud sync (if enabled)
- WeatherKit (if you use the location-based temperature feature)
The app does not:
- Phone home to any server
- Check for updates via external endpoints
- Load remote assets or configurations
Location and Weather Data
Sidewall optionally uses your device's location to fetch current weather conditions from Apple's WeatherKit service. This feature helps auto-fill the riding temperature for more accurate pressure calculations.
- When collected: Only when you tap the location button next to the temperature field
- What's collected: Your device's current location is sent to Apple's servers to retrieve weather data
- Storage: Your location is not stored, logged, or transmitted to any servers other than Apple's WeatherKit
- Third parties: Apple processes the location request per their privacy policy
- Optional: You can always manually enter the temperature instead
Tracking
Sidewall does not track you in any way:
- No device fingerprinting
- No advertising identifiers
- No cross-app tracking
- No user behavior tracking
This is declared in the app's PrivacyInfo.xcprivacy manifest with
NSPrivacyTracking set to false and empty tracking domains.
Apple Privacy Nutrition Label
Based on Apple's App Privacy requirements, Sidewall declares:
| Category | Declaration |
|---|---|
| Data Used to Track You | None |
| Data Linked to You | None |
| Data Not Linked to You | None |
Permissions
Sidewall requests minimal permissions:
- Photo Library: Optional access to add photos to your bike profiles. Photos are stored locally and synced only via your private iCloud.
- Location: Optional access to fetch current weather for temperature auto-fill. Your location is sent only to Apple's WeatherKit and is not stored or logged.
- No contacts access
- No health data access
- No notification permissions
The only other optional system integration is iCloud, managed through your device settings.
Children's Privacy
Sidewall does not collect any data and is safe for users of all ages. There is no content that requires age restrictions.
Changes to This Policy
If we make changes to this privacy policy, we will update the "Last updated" date at the top. Since we collect no data and have no way to contact users, significant changes would only be communicated through App Store update notes.
Contact
For questions about this privacy policy or the app:
- Developer: Tim Heuer
- App: Sidewall
Open Source Algorithms
Sidewall implements pressure calculation algorithms based on publicly documented methods from Silca, Wolftooth, and SRAM. These are registered trademarks of their respective owners. Sidewall is not affiliated with or endorsed by these companies.