# Noise Diary: dB Log — Measure, note and export noise

> Measure, note and export noise (iPhone/iPad app by 逸文 周.)

- Source: https://appshunter.io/ios/app/noise-diary-db-log/id6795772385 (this page in markdown: same URL + `.md`)
- Developer: [逸文 周](https://appshunter.io/developer/1484299344)
- Category: Utilities, Productivity
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 17.0 · 2 MB
- Languages: American English, Japanese, Chinese (Simplified, China)
- Released: 2026-08-19
- Data updated: 2026-08-24
- User reviews in markdown: https://appshunter.io/ios/app/noise-diary-db-log/id6795772385/reviews.md

## What is Noise Diary?

Noise Diary is a focused tool for measuring environmental sound and saving the moment as a noise event.

What you can do:

- See an approximate dB(A) reading
- Start and end an event to save Leq, maximum, and minimum
- Add a tag and notes
- Review a local timeline
- Export CSV and PDF
- Apply local calibration using a reference sound level meter
- Continue only an event you started while the screen is locked or another app is open

Privacy first:

- Analysis runs on your device
- No audio recording is created
- Audio and measurements are not uploaded
- No background measurement outside an event you start

Important: Readings are approximate values calculated from the iPhone microphone. Noise Diary is not an IEC-compliant professional sound level meter. Do not use it for legal, health, hearing-safety, or workplace-compliance decisions.

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Noise Diary Pro Lifetime | $6.99 | one-time |



## Version history (last 1 release)

### 1.0 — 2026-08-19

No release notes.

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All apps by 逸文 周: https://appshunter.io/developer/1484299344

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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 2026-08-24.*