# Sound Noise Meter+ dB SPL — WHO/OSHA dosimeter + verdict

> iPhone sound level meter with OSHA/NIOSH noise dose tracking and calibration. (iPhone/iPad app by Kyu-Hee Jang.)

- Source: https://appshunter.io/ios/app/sound-noise-meter-plus-db-spl/id1593197145 (this page in markdown: same URL + `.md`)
- Developer: [Kyu-Hee Jang](https://appshunter.io/developer/1587578867)
- Category: Utilities, Productivity
- Price: Free
- Rating: 3.00/5 from 2 App Store ratings
- Age rating: 17+
- Requires: iOS 16.4 · 59 MB
- Languages: American English
- Released: 2021-11-02
- Data updated: 2026-08-16
- Monetization: ad-supported
- User reviews in markdown: https://appshunter.io/ios/app/sound-noise-meter-plus-db-spl/id1593197145/reviews.md

## What is Sound Noise Meter+ dB SPL?

Sound Noise Meter+ is a professional-grade sound level meter with built-in OSHA/NIOSH 8-hour noise dose tracking, A/C/Z weighting, and one-tap Quiet Room calibration. No hardware required — just your iPhone.

The radial gauge displays live dB SPL from 0 to 120, color-coded green / yellow / red so you can read your environment at a glance. Switch to the Dose Panel to watch your 8-hour TWA build in real time, with separate OSHA (90 dBA / 5 dB exchange) and NIOSH (85 dBA / 3 dB exchange) accumulators.

Key Features:
• Real-time decibel measurement (0–120 dB SPL)
• OSHA + NIOSH 8-hour noise dose tracking with TWA
• A / C / Z weighting toggle (dBA · dBC · dBZ)
• Quiet Room one-tap calibration (3-second auto-cal)
• Animated radial gauge with color-coded noise levels
• Live waveform chart with continuous monitoring
• Min, Average, and Max dB tracking per session
• Manual calibration adjustment (±20 dB) for precision tuning
• 12 noise level descriptions with reference examples
• Dark theme interface optimized for any environment

Perfect For:
• Checking workplace noise levels for OSHA compliance
• Monitoring neighborhood and traffic noise
• Measuring music venue and concert sound levels
• Assessing classroom or office noise environments
• Testing speaker and audio equipment output
• Environmental noise surveys and studies

The app features an intuitive dark interface with a professional radial gauge that animates smoothly as sound levels change. Track minimum, average, and maximum readings to understand noise patterns over time. The built-in calibration tool lets you fine-tune measurements for your specific device.

Your privacy matters — all audio processing happens locally on your device. No recordings are stored or transmitted. Sound Noise Meter respects your privacy completely.

## Key features

- Real-time decibel measurement (0–120 dB SPL)
- OSHA + NIOSH 8-hour noise dose tracking
- A / C / Z weighting toggle
- One-tap quiet room calibration
- Color-coded radial gauge
- Live waveform chart
- Min, Average, and Max dB tracking


## Frequently asked questions about Sound Noise Meter+ dB SPL

### What is Sound Noise Meter+ dB SPL?

Sound Noise Meter+ dB SPL is a utility app that uses your iPhone's microphone to measure sound pressure levels (SPL) in decibels. It also provides tracking for 8-hour noise doses according to OSHA and NIOSH standards.

### Does Sound Noise Meter+ dB SPL have ads?

Yes, this app contains advertisements. As it is free to download and use, advertisements are displayed to support its development and maintenance.

### How accurate is Sound Noise Meter+ dB SPL?

The app offers features like one-tap Quiet Room calibration and manual adjustment up to ±20 dB for precision tuning. However, accuracy can vary based on the iPhone model and its microphone.

### What devices does Sound Noise Meter+ dB SPL support?

Sound Noise Meter+ dB SPL is supported on iPhone and iPod devices. It is designed for iOS operating systems.

### What is the age rating for Sound Noise Meter+ dB SPL?

The app has an age rating of 17+. This is likely due to the nature of measuring potentially high decibel levels and the professional context of its features.

### How often is Sound Noise Meter+ dB SPL updated?

The latest version of Sound Noise Meter+ dB SPL is 3.2.13, and it was last updated on May 26, 2026. This indicates a recent update, suggesting ongoing support and development.

### Can Sound Noise Meter+ dB SPL be used offline?

The core functionality of measuring decibel levels and tracking noise dose can be performed offline as it relies on the device's microphone. However, some features might require an internet connection for calibration data or updates.

### What are the different weighting options in Sound Noise Meter+ dB SPL?

Sound Noise Meter+ dB SPL allows you to toggle between A, C, and Z weighting. These different weightings simulate how the human ear perceives sound at various frequencies, offering different perspectives on noise measurement.

## Version history (last 5 releases)

### 3.2.28 — 2026-08-15

New: today's total noise exposure, added up across every session — exposure limits are set per day, but the app only ever showed one session at a time. Also: measuring now starts the instant you tap, and the quiet-room reference tells you when the room is too noisy for it to be reliable instead of just saying "calibrated".

Thanks for the reviews and feedback!

### 3.2.24 — 2026-08-05

Now fully localized — the app displays in your device's language. Plus performance and stability improvements.

### 3.2.23 — 2026-07-21

Save your measurements as sessions. Each recording now keeps LAeq, Lmax, L10, and L90 statistics so you can review real sound-exposure data, and you can export any session to CSV to share or analyze later.

### 3.2.22 — 2026-07-14

Stability and performance improvements.

### 3.2.21 — 2026-07-06

We fixed a rare crash some users saw on launch, along with performance and stability improvements. Thank you for your patience and for helping us make the app better!

## Apps similar to Sound Noise Meter+ dB SPL

| App | Rating | Price | Category |
| --- | --- | --- | --- |
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All apps by Kyu-Hee Jang: https://appshunter.io/developer/1587578867

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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 2026-08-16.*