# Sonar Ruler: Sound Distance — Ultrasonic Echo Measurement

> Ultrasonic Echo Measurement (iPhone/iPad app by Kyu-Hee Jang.)

- Source: https://appshunter.io/ios/app/sonar-ruler-sound-distance/id6761255046 (this page in markdown: same URL + `.md`)
- Developer: [Kyu-Hee Jang](https://appshunter.io/developer/1587578867)
- Category: Utilities, Productivity
- Price: Free
- Age rating: 17+
- Requires: iOS 15.1 · 31 MB
- Languages: American English
- Released: 2026-03-31
- Data updated: 2026-05-17
- User reviews in markdown: https://appshunter.io/ios/app/sonar-ruler-sound-distance/id6761255046/reviews.md

## What is Sonar Ruler?

Sonar Ruler+ measures distance using sound wave echoes — like submarine sonar. The speaker emits a chirp pulse and the microphone detects the reflection to calculate distance.

Watch the real-time waveform visualization showing the emitted pulse and returning echo, making this both a measurement tool and a physics education experience.

Key Features:
- Sound wave echo distance measurement
- Real-time waveform visualization
- Chirp signal + cross-correlation for precision
- Auto noise gate for background filtering
- Multi-measurement averaging (5 readings)
- Temperature compensation for sound speed
- Unit conversion (m/ft/in)
- Measurement history

No LiDAR or Pro model needed — works with any iPhone using pure acoustics.


## Version history (last 1 release)

### 1.0 — 2026-03-31

No release notes.

## More apps by Kyu-Hee Jang

- [Calculator+ Tip Tax BMI Unit](https://appshunter.io/ios/app/calculator-plus-tip-tax-bmi-unit/id1587591476)
- [QR Lens+ Barcode Scanner Pro](https://appshunter.io/ios/app/qr-lens-plus-barcode-scanner-pro/id1590631012)
- [Sound Noise Meter+ dB SPL](https://appshunter.io/ios/app/sound-noise-meter-plus-db-spl/id1593197145)
- [Tremor Vibration Meter](https://appshunter.io/ios/app/tremor-vibration-meter/id6759666731)
- [Lux Light Meter - Luminance](https://appshunter.io/ios/app/lux-light-meter-luminance/id6759858193)
- [Barometer: Air Pressure](https://appshunter.io/ios/app/barometer-air-pressure/id6759883097)

All apps by Kyu-Hee Jang: https://appshunter.io/developer/1587578867

---

*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-05-17.*