# NIOSH Sound Level Meter Pro — Noise Level & Sound Detector

> Noise Level & Sound Detector (iPhone/iPad app by IMAD EDDINE EL QSIMI.)

- Source: https://appshunter.io/ios/app/niosh-sound-level-meter-pro/id6801904741 (this page in markdown: same URL + `.md`)
- Developer: [IMAD EDDINE EL QSIMI](https://appshunter.io/developer/1873780945)
- Category: Utilities, Entertainment
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 15.0 · 81 MB
- Languages: American English
- Released: 2026-08-31
- Data updated: 2026-09-11
- User reviews in markdown: https://appshunter.io/ios/app/niosh-sound-level-meter-pro/id6801904741/reviews.md

## What is NIOSH Sound Level Meter Pro?

# Decibel Meter Pro: AI Sound

**Decibel Meter Pro: AI Sound** is an all-in-one acoustic engineering and noise measurement suite. Engineered for sound technicians, workplace safety inspectors, environmental researchers, acoustic enthusiasts, and everyday users, this app transforms your device into a certified-grade sound level meter (SPL), occupational noise dosimeter, AI sound classifier, camera noise evidence recorder, and precision tone generator.

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### Precision Decibel Meter & SPL Analyzer
Measure environmental sound pressure levels (SPL) in real time with high accuracy:
- **Instantaneous Sound Pressure**: Real-time dB readings with an ultra-responsive radial gauge (0 to 120+ dB).
- **Acoustic Readouts**: Instant, Minimum (Min), Maximum (Max), and Average (Avg) decibel tracking.
- **Live Waveform Chart**: Track sound level variations over time with dynamic scrolling waveform graphs.
- **Hardware Calibration**: Adjust microphone sensitivity with custom ±dB calibration offsets.
- **Reference Scale**: Compare measurements against real-world references (30 dB to 140 dB).

### Occupational Noise Dosimeter (OSHA & NIOSH)
Protect hearing and maintain workplace compliance with standard dosimeter monitoring:
- **Standards Presets**: Switch between **NIOSH REL** (85 dB / 3 dB), **OSHA HC** (90 dB / 5 dB), and **OSHA PEL**.
- **Real-Time & Projected Dose %**: Monitor live noise dose accumulation and projected 8-hour daily exposure.
- **TWA & Leq Metrics**: Calculate accurate Time-Weighted Average (TWA) and Equivalent Continuous Sound (Leq).
- **Hearing Risk Alerts**: Real-time color-coded safety guidance (Safe, Action Level, Hazardous).
- **Session History**: Save, review, and manage completed dosimeter sessions with exposure data.

### AI Sound Recognition & Classifier
Powered by on-device Edge AI machine learning (TensorFlow Lite / YAMNet):
- **Real-Time Sound Recognition**: Identifies speech, sirens, alarms, dogs, machinery, music, and nature.
- **Confidence Scoring**: Displays real-time detection probability percentages for every sound event.
- **Event Timeline**: Logs detected environmental sounds chronologically with exact timestamps.
- **100% On-Device Privacy**: All neural network processing runs locally—zero audio is sent to the cloud.

### Camera Sound Overlay & Visual Evidence
Document noise violations, workplace audits, and neighborhood sound levels with photo evidence:
- **Live Decibel HUD**: Real-time dB, Peak dB, Min/Max/Avg, and timestamps overlaid on viewfinder.
- **Watermarked Capture**: Save calibrated photo evidence with embedded sound stats to gallery.
- **Dual Camera**: Switch seamlessly between front and rear cameras for handheld and site audits.

### Audio Frequency Generator (20 Hz – 20 kHz)
Generate pure sine wave frequencies across the entire audible spectrum:
- **Full Spectrum Range**: Smoothly sweep from 20 Hz sub-bass to 20,000 Hz treble.
- **Gesture Controls**: Adjust frequencies with vertical drag gestures and quick presets (Low, Mid, High).
- **Acoustic Testing**: Perfect for speaker testing, subwoofer tuning, room acoustics, and tinnitus relief.

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### Privacy & Battery Efficiency
- **Zero Cloud Recording**: Audio is processed in memory only; never recorded or shared.
- **Optimized Performance**: Native audio processing with minimal battery drain.
- **Adaptive Themes**: Clean Light & Dark modes for high contrast in all lighting.


Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| Bd Meter Premium Weekly | $5.99 | per 7 days |
| Bd Meter Premium Monthly | $9.99 | per month |
| Bd Meter Premium Yearly | $14.99 | per year |



## Version history (last 3 releases)

### 3.0 — 2026-09-03

Bug fixes and performance improvements.
Fixed an issue where some premium users could still see reward prompts in Dosimeter and Frequency after restoring purchases.

### 2.0 — 2026-08-31

Fixed a bug that could prevent AI Sound from loading on some iPhone devices.
Improved iOS stability and startup reliability for AI sound detection.

### 1.0 — 2026-08-31

No release notes.

## More apps by IMAD EDDINE EL QSIMI

- [AquaFlow Shower Reminder](https://appshunter.io/ios/app/aquaflow-shower-reminder/id6758736090)
- [B Pressure Tracking](https://appshunter.io/ios/app/b-pressure-tracking/id6759395743)
- [Clear Wave : Phone Speaker Fix](https://appshunter.io/ios/app/clear-wave-phone-speaker-fix/id6760778244)
- [Wifi Speed Check Test](https://appshunter.io/ios/app/wifi-speed-check-test/id6761727300)
- [Ble-Scanner & Bluetooth Finder](https://appshunter.io/ios/app/ble-scanner-and-bluetooth-finder/id6777495056)

All apps by IMAD EDDINE EL QSIMI: https://appshunter.io/developer/1873780945

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*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 2026-09-11.*