Cataster
Noise level measuring app with GPS tagging and shared map. Expo + Supabase.
Item Description
Cataster measures ambient noise using the device microphone, tags each reading with location and time, and plots them on a shared map backed by Supabase. Built with Expo, React Native and TypeScript. Full source code, a setup guide and the Supabase SQL schema are included. What is not included — please read The dBFS-to-SPL conversion uses a fixed offset. Microphone sensitivity varies by device by roughly ±15 dB, so the absolute values are not calibrated — they are useful as relative comparisons, not as measurements you could cite.
If you ship this, add a per-device calibration flow and label readings accordingly. That is a real piece of work, and the price reflects that it is missing. The UI text is German and there is no i18n layer. No in-app purchases. Sold as-is. No support, updates or customization included.
Features
- Real-time noise measurement via device microphone
- GPS tagging, clustered to ~100 m for privacy
- Shared map view of all readings
- Time-of-day filtering
- Offline mode — works locally without Supabase
- Supabase auth and database integration
- Expo, React Native, TypeScript (strict)
- Full source code, README and SQL schema included
$ 29
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Information
| Category | App Templates / Android |
| First Release | 18 August 2026 |
| Platforms | iOS 13, Android 8.0, Android 9.0, Android 10.0 |
| Files included | .html, .css, .sql, .cs, .xml, .c |
| File Size | 4 MB |
| Frameworks | Android |
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