# Decibel Meter+ Sound Level dB — Noise Dosimeter · WHO & OSHA

> 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/decibel-meter-plus-sound-level-db/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: 2026-10-02
- Monetization: ad-supported
- User reviews in markdown: https://appshunter.io/ios/app/decibel-meter-plus-sound-level-db/id1593197145/reviews.md

## What is Decibel Meter+ Sound Level dB?

Decibel Meter: Sound Level dB turns your iPhone microphone into a live sound level meter. Press the big Start button under the gauge (or tap the gauge) and see how loud it is in decibels, with the running minimum, average and maximum right below.

▶ Measure
• Radial gauge from 0 to 120 dB with a Fast (125 ms) response, so the needle follows the sound instead of flickering
• dBA, dBC or dBZ: switch the frequency weighting from the chip at the top
• Min, average (energy average, not a plain mean of the numbers) and max for the session
• A one-line verdict that puts the level in everyday terms, from quiet library to hearing damage zone
• An OVER warning when the microphone is saturated, so a flat ceiling reading is never mistaken for a real value

▶ Pause and see your summary
Pause after 30 seconds or more and a summary card shows the duration, average, max, dose and 8-hour TWA of the standard you chose. Resume carries on with the same session; New session files it into your log and starts clean. The card keeps the numbers from the moment you paused, even if you change the weighting or the standard afterwards.

▶ Noise dosimeter
• Two standards: WHO (85 dBA, 3 dB exchange, 8 h) and OSHA (90 dBA, 5 dB exchange, 8 h)
• Daily dose %, 8-hour TWA and time left until 100 %
• The dose always uses the A-weighted level, whatever weighting is on the gauge
• Switching the standard shows that standard's own total for the whole session
• 7-day dose chart, and an alert with a short vibration when the level stays at or above the criterion for 10 seconds

▶ Logs
• Noise events: every stretch above your threshold that lasts 5 seconds or more is logged with its peak and average, and the list can be shared as text
• Session log with LAeq, Lmax, L10 and L90 for sessions of 30 seconds or more, exportable as CSV
• A summary report across all sessions, unlocked by watching a short video

▶ Calibration
Phone microphones differ. Adjust the offset from −20 to +20 dB against a reference meter, or use Quiet Cal for a quick approximate reference in a quiet room. The app tells you when the room was too loud for that reference to be trusted.

▶ Good to know
• The screen stays on while measuring, and an optional auto-stop ends a run after 4 hours
• Measuring pauses when you leave the app and resumes when you come back; it does not measure in the background
• No audio is saved; the app only computes levels from the live microphone signal
• A phone is not a certified sound level meter. Use the readings for everyday checks and comparisons, not for legal or compliance measurements.

Handy for a noisy workplace, a concert, traffic outside the window, a neighbour's music, a classroom, or checking how loud your own speakers are.

## 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 Decibel Meter+ Sound Level dB

### 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)

### 3.2.30 — 2026-09-25

• Start with one big button right under the gauge, or simply tap the gauge.
• Pause after 30 seconds or more to get a summary card: duration, average, max, dose and 8-hour TWA, with Resume or New session.
• Switching between WHO and OSHA now shows that standard's own dose for the whole session.
• Cleaner line icons and steady-width numbers.

### 3.2.29 — 2026-08-30

Store screens now show the live dB meter in 30 languages — min/avg/max, calibration and everyday examples from rain to subway. Dutch, Danish, Finnish, Czech and Hebrew pages added.

### 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.

## Apps similar to Decibel Meter+ Sound Level dB

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Decibel Meter Sound Level dB](https://appshunter.io/ios/app/decibel-meter-sound-level-db/id1609178369) | 4.4 (24) | Free | Utilities |
| [Decibel: dB Sound Meter](https://appshunter.io/ios/app/decibel-db-sound-meter/id1620285258) | 4.0 (6) | Free | Utilities |
| [Sound Meter - Decibel Pro](https://appshunter.io/ios/app/sound-meter-decibel-pro/id1603557612) | 4.3 (29) | Free | Utilities |
| [i Sound Level Meter](https://appshunter.io/ios/app/i-sound-level-meter/id912170360) | 4.4 (37) | Free | Utilities |
| [Decibel Meter - dB Noise Meter](https://appshunter.io/ios/app/decibel-meter-db-noise-meter/id6504185770) | 4.5 (2) | Free | Utilities |
| [Decibel Metre (Sound Meter)](https://appshunter.io/ios/app/decibel-metre-sound-meter/id1590659820) | 4.5 (577) | Free | Utilities |

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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 2026-10-02.*