# Decibel - Sound level checker

> Decibel - Sound level checker (iPhone/iPad app by ERIC ANDREE HULTGREN.)

- Source: https://appshunter.io/ios/app/decibel-sound-level-checker/id6775396227 (this page in markdown: same URL + `.md`)
- Developer: [ERIC ANDREE HULTGREN](https://appshunter.io/developer/6775396229)
- Category: Utilities
- Price: Free
- Age rating: 4+
- Requires: iOS 17.0 · 1 MB
- Languages: American English
- Released: 2026-06-04
- Data updated: 2026-09-10
- User reviews in markdown: https://appshunter.io/ios/app/decibel-sound-level-checker/id6775396227/reviews.md

## What is Decibel?

Decibel turns your iPhone into an ambient sound-level meter — a precise, restrained instrument for understanding the noise around you.

THE READOUT
A single number, measured in real time and smoothed enough to actually read. The screen shifts colour with the level - green when quiet, amber at conversation, red when loud - so you feel the room before you read the value.


THE RECORDING
Tap the red button to start a measurement session. Decibel tracks the peak and average dB along with a live 15-second waveform. Tap again to stop, and the session is saved to your local history with its timestamp, duration, peak, and average - no audio is recorded, only the summary.


THE INSTRUMENT
- Two-tier smoothing - a fast filter drives the bar and the background tint, a slower one keeps the headline number stable
- Calibration sheet - tune Decibel against a reference meter you trust, so readings match on your specific device
- Live waveform during recording, showing variation at a glance
- Recording history persists across sessions; swipe to delete or clear all
- Custom typography, dark-only design, full-screen meter, no distractions


ON-DEVICE, ALWAYS
- Audio is processed in real time and immediately discarded — no audio is recorded, stored, or transmitted
- Only summary statistics from recording sessions are saved (start time, duration, peak dB, average dB), to your phone's local storage
- No analytics, no tracking, no accounts, no advertising, no network requests
- No third-party SDKs


ON ACCURACY
iPhone microphones are not laboratory-calibrated, so the values shown are estimates. Treat them as a relative measure - how loud one environment is compared to another - not as certified sound-pressure measurements.

Decibel is not suitable for hearing-safety decisions, OSHA or NIOSH compliance, medical assessment, or any purpose where measurement accuracy matters. For those, use a certified Type 1 or Type 2 sound-level meter. The Calibration sheet improves the relative accuracy of readings on your device but does not turn the app into a certified instrument.


## Version history (last 1 release)

### 1.0 — 2026-06-04

No release notes.

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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 2026-09-10.*