# Decibel Dossier: Sound Meter — Noise level meter & dB report

> Noise level meter & dB report (iPhone/iPad app by 秋林 周.)

- Source: https://appshunter.io/ios/app/decibel-dossier-sound-meter/id6781592865 (this page in markdown: same URL + `.md`)
- Developer: [秋林 周](https://appshunter.io/developer/6781092297)
- Category: Utilities, Productivity
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 16.0 · 3 MB
- Languages: American English, Chinese (Simplified, China)
- Released: 2026-06-24
- Data updated: 2026-07-30
- User reviews in markdown: https://appshunter.io/ios/app/decibel-dossier-sound-meter/id6781592865/reviews.md

## What is Decibel Dossier?

Decibel Dossier turns your iPhone into a sound level meter that not only measures noise, but records it and produces a verifiable report.

Measure
Real-time sound pressure level in dB(A) and dB(C), with Leq (equivalent level), max/min, L10/L90 statistics, a live spectrum and a time history.

Hearing safety
Your reading is compared against NIOSH and OSHA occupational-noise references: a hazard level (safe / moderate / hazardous) and the recommended safe exposure time at the current level (for example, about 8 hours at 85 dBA, halving every 3 dB). A quick reference chart shows how the level compares to everyday sounds.

Report
Generate a structured PDF report containing the measurement details, capture device and calibration status, statistics, the hearing-safety assessment, and a disclaimer. Each report carries a digital-signature QR code, so anyone receiving it can scan and confirm the key fields have not been altered.

Records
Every measurement is saved on your device. Review history, add the location and noise source, and export at any time.

Privacy
Measurement, statistics and reports are all processed on your device. The microphone audio is converted to a sound level in real time and discarded; no recordings are stored, nothing is uploaded, and there is no account.

Free to measure; exporting a watermark-free report requires a one-time purchase (a single report or a lifetime unlock).

Note: this is a consumer measurement tool. A phone microphone is not a certified measuring instrument, and readings depend on the device, environment and how you hold it. Results are for reference and are not a legal or occupational-health determination. For a measurement with legal standing, use a calibrated Type 1/2 sound level meter or a qualified professional.

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

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| Yearly membership | $19.99 | per year |
| Monthly membership | $4.99 | per month |

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| One report | $2.99 | one-time |
| Lifetime unlock | $39.99 | one-time |



## Version history (last 5 releases)

### 1.0.4 — 2026-07-12

Now available in Spanish, Portuguese, German, French, Japanese and Russian. Search improvements and minor fixes.

### 1.0.3 — 2026-07-09

Membership subscriptions (monthly and yearly) are now available alongside the single report and lifetime unlock. Minor fixes.

### 1.0.2 — 2026-07-08

Membership subscriptions are now available: monthly and yearly, alongside the existing single report and lifetime unlock. You can open the unlock page straight from Settings without measuring first. Assorted display fixes.

### 1.0.1 — 2026-07-02

Bug fixes and improvements.

### 1.0 — 2026-06-24

No release notes.

## More apps by 秋林 周

- [Snorah: Snore Recorder](https://appshunter.io/ios/app/snorah-snore-recorder/id6784126749)
- [Luxleaf: Plant Light Meter](https://appshunter.io/ios/app/luxleaf-plant-light-meter/id6787843768)

All apps by 秋林 周: https://appshunter.io/developer/6781092297

---

*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 2026-07-30.*