# Decibel Kit: Noise Dosimeter — dB Meter, Spectrum, Noise Dose

> dB Meter, Spectrum, Noise Dose (iPhone/iPad app by Signet LLC.)

- Source: https://appshunter.io/ios/app/decibel-kit-noise-dosimeter/id6776589152 (this page in markdown: same URL + `.md`)
- Developer: [Signet LLC](https://appshunter.io/developer/1880910401)
- Category: Utilities, Health & Fitness
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 17.0 · 21 MB
- Languages: American English, French (France), German (Germany), Japanese, Korean, Chinese (Simplified, China)
- Released: 2026-06-11
- Data updated: 2026-08-27
- User reviews in markdown: https://appshunter.io/ios/app/decibel-kit-noise-dosimeter/id6776589152/reviews.md

## What is Decibel Kit?

Decibel Kit is a buy-once acoustic measurement kit that brings a sound level meter, spectrum analysis, a dosimeter and evidence reports together in one app. There is no subscription.

■ Live measuring is all free — and never stops
The dB meter, spectrum (FFT / RTA / octave bands / spectrogram), the NIOSH / OSHA dosimeter, the learning content and the camera dB overlay are free from the start, with no count or time limits.

■ One-time purchase, no subscription
"Pro" is yours forever after a single purchase. No monthly or yearly fees. We never take back a feature you have already unlocked. There is just one purchase screen, and you can close it anytime with the ×.

■ What Pro adds (keep it, prove it, export it)
• Save recordings and history (with audio)
• Export to PDF / CSV / WAV / HTML
• Save evidence photos and videos
• Save calibration profiles
• iCloud sync and Health integration
• Apple Pencil annotation, Before/After compare, trimming

■ Professional analysis
A / C / Z / B / ITU-R 468 weighting, Fast / Slow response, Leq, L10, L90, TWA, peak hold, 1/1 to 1/24 octave bands, adjustable ranges.

■ Numbers you can trust
Save device-specific calibration profiles for free, with a "±N dB" confidence range always on screen.

■ Strong as evidence
Photos and videos with dB, date/time and location burned in, your own notes, a tamper-evident SHA-256 hash, and a region-aware noise-regulation guide — all in one report. Great for neighbor, construction and workplace records.

■ Measure without stopping your music
Measure while music, AirPlay or Bluetooth keeps playing.

■ On iPhone, iPad and Mac
Universal. On large screens you can view the FFT / RTA / spectrogram side by side.

* This app provides hearing-safety guidance only and is not a medical device. It cannot be used for diagnosis or treatment.

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Decibel Kit Pro | $2.99 | one-time |



## Version history (last 5 releases)

### 1.0.4 — 2026-07-30

Minor improvements and stability fixes.

### 1.0.3 — 2026-07-09

Stability improvements and minor refinements.

### 1.0.2 — 2026-07-05

Stability improvements and minor refinements.

### 1.0.1 — 2026-07-04

Bug fixes and performance improvements.

### 1.0 — 2026-06-11

No release notes.

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## More apps by Signet LLC

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- [HzTones: Sleep Sounds & Focus](https://appshunter.io/ios/app/hztones-sleep-sounds-and-focus/id6772490260)

All apps by Signet LLC: https://appshunter.io/developer/1880910401

## Related topics

[noise dosimeter](https://appshunter.io/ios/topics/noise-dosimeter) · [dosimeter](https://appshunter.io/ios/topics/dosimeter)

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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 2026-08-27.*