Shizumo is a privacy-first noise meter that measures ambient sound for **10–30 seconds** and saves a snapshot so you can review trends over time—without chasing noisy moment-to-moment numbers.

### Highlights
- **Tap-to-save snapshots**: tap → measure 10–30s → saved to history
- **Place-based guidelines**: recommended dB for common places + adjustable levels
- **Custom places (up to 3)**: add your own places with name, icon, and baseline dB
- **Quiet Score**: see how often you stay under your guideline
- **Readable history**: date grouping + mini trend sparkline
- **Export**: share your history as CSV
- **Languages**: Korean / Japanese / English

### Privacy
- Requires **Microphone permission** to estimate sound level (dB).
- **No raw audio is recorded, stored, or transmitted.**
- Only on-device settings and summary results may be stored locally.

Note: dB values are estimates and can vary by device/environment.