# dB Sound Level Meter & Noise — A, C, Z weighting to IEC 61672

> A, C, Z weighting to IEC 61672 (iPhone/iPad app by fung ka wa.)

- Source: https://appshunter.io/ios/app/db-sound-level-meter-and-noise/id6781215060 (this page in markdown: same URL + `.md`)
- Developer: [fung ka wa](https://appshunter.io/developer/6778859454)
- Category: Utilities
- Price: Free
- Age rating: 4+
- Requires: iOS 15.0 · 20 MB
- Languages: American English
- Released: 2026-06-26
- Data updated: 2026-09-04
- User reviews in markdown: https://appshunter.io/ios/app/db-sound-level-meter-and-noise/id6781215060/reviews.md

## What is dB Sound Level Meter & Noise?

Most decibel apps show you a number and hope you don't ask questions.
This one shows you the number, tells you which scale it's on, and lets
you correct it.


WHAT YOU GET

- A, C and Z frequency weighting — with a plain-English explanation of
  what each one does, right next to the switch
- Fast (125 ms) and Slow (1 s) time weighting, to IEC 61672
- MIN, AVG and MAX for every session, with MAX built to hold short,
  sharp sounds instead of averaging them away
- A calibration offset you control, ±30 dB, saved between sessions
- HOLD to freeze the display without stopping the measurement
- Session history, with undo on every destructive action


BUILT NOT TO BREAK

- Keeps measuring when you plug in headphones, connect Bluetooth, or
  switch back to the built-in mic — and tells you when the input changed
- Handles low sample-rate inputs instead of refusing to work. If your
  Bluetooth headset runs at 16 kHz, the app says so and tells you the
  frequency range it can still cover
- Comes back on its own after a phone call, an alarm, or a trip to
  another app. No restart, no lost session
- Measures while your music, podcast or call keeps playing


HONEST ABOUT WHAT IT IS

This is a phone app using a phone microphone. It is not a certified
sound level meter. Don't use it where a Type 1 or Type 2 instrument is
required, or as the basis for a legal, medical or workplace decision.

The colour zones on the dial are guidance, not a verdict. Readings
depend on your device, the microphone in use, and your calibration
setting. If the absolute level matters to you, set the calibration
offset against a reference meter first — that's what the slider is for.


FREE, AND STAYING THAT WAY

No subscription. No sign-in. No account. No paywalled features. Works
with no internet connection at all. Supported by ads.


## Version history (last 2 releases)

### 1.0.1 — 2026-08-25

Rebuilt the measurement engine.

- A, C and Z frequency weighting, with an in-app explanation of each
- Fast and Slow time weighting to IEC 61672
- MAX now catches short, sharp sounds it used to average away
- Keeps working when the audio route or sample rate changes —
  headphones, Bluetooth, built-in mic
- Recovers on its own after calls, alarms and backgrounding
- Measures while your music keeps playing
- Undo when clearing calibration or clearing history
- Improved layout at larger text sizes
- Minor fixes and refinements

### 1.0 — 2026-06-26

No release notes.

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All apps by fung ka wa: https://appshunter.io/developer/6778859454

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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 2026-09-04.*