Privacy Policy
Real Size Ruler is engineered from the ground up to respect your privacy. All measurements, calibrations, and coordinate calculations happen 100% client-side in your browser.
1. Zero Personal Data Collection
Real Size Ruler does not collect, transmit, sell, or monetize any personal identification information (PII). When you use the on-screen ruler, all measurements, crosshair coordinates, and calibration adjustments exist solely in your device's temporary memory. We do not use remote telemetry, advertising pixels, or session recording tools.
2. Cookies & Local Storage Usage
We do not use tracking cookies or third-party marketing beacons. We only utilize your browser's local storage (localStorage) for functional display preferences and calibration persistence:
| Storage Key | Data Purpose | Scope |
|---|---|---|
| realsizeruler_theme | Saves your dark/light theme preference so your chosen appearance persists across visits. | Browser Local |
| realsizeruler_lang | Remembers your selected language among our 10 supported regional languages. | Browser Local |
| realsizeruler_ppi | Stores your screen's calibrated Pixels-Per-Inch (PPI) so you do not need to re-calibrate every session. | Browser Local |
| realsizeruler_calibrated | Flags whether your display has completed calibration verification. | Browser Local |
| realsizeruler_unit | Saves your last active unit of measurement (cm, inches, mm, px, feet, or pica). | Browser Local |
| realsizeruler_edges | Remembers which screen edges (top, bottom, left, right) have active rulers. | Browser Local |
3. Client-Side Measurement Integrity
All mathematical conversions between CSS pixels, physical millimeters, and fractional inches are computed directly on your device via client-side JavaScript. No screen images, dimensions, or object photos ever leave your computer or phone.
4. Your Data Rights & Control
Because your data stays entirely on your device, you have complete control. You can reset all saved calibration and preference data at any time by clicking 'Reset to Default' in the calibrator dialog or by clearing your browser's site data / local storage.
5. Contact & Privacy Inquiries
If you have any questions or security inquiries regarding this privacy policy, please contact us at support@realsizeruler.com.