# DecibelLab: Sound Level Meter — Spectrum·Dose·Hearing Guard

> Spectrum·Dose·Hearing Guard (iPhone/iPad app by 永芳 徐.)

- Source: https://appshunter.io/ios/app/decibellab-sound-level-meter/id6761004946 (this page in markdown: same URL + `.md`)
- Developer: [永芳 徐](https://appshunter.io/developer/1887200583)
- Category: Utilities, Productivity
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 18.0 · 15 MB
- Languages: American English, Arabic, Dutch, French (France), German (Germany), Hindi, Indonesian, Italian, Japanese, Korean and 11 more
- Released: 2026-03-31
- Data updated: 2026-07-10
- User reviews in markdown: https://appshunter.io/ios/app/decibellab-sound-level-meter/id6761004946/reviews.md

## What is DecibelLab?

DecibelLab is a professional-grade noise measurement and analysis tool that turns your iPhone into a portable sound level meter. Whether you're an audio engineer, a construction safety supervisor, or an everyday user concerned about hearing health, DecibelLab provides precise noise data.

◆ REAL-TIME DECIBEL MEASUREMENT
• 0-130 dB wide-range detection with real-time response
• dBA / dBC / dBZ three frequency weightings
• Slow / Fast / Ultra-fast response modes
• Five visualizations: Waveform, Bar Chart, Gauge, Heatmap, Radar

◆ FFT SPECTRUM ANALYSIS
• Octave / 1/3 Octave / FFT three display modes
• Real-time dominant frequency identification and musical note display
• Peak hold function

◆ NOISE DOSIMETER
• NIOSH (85dB/3dB) and OSHA (90dB/5dB) dual standards
• NC/NR spectrum-based environmental acoustic rating
• TWA time-weighted average and 8-hour dose percentage
• Real-time hearing protection risk assessment

◆ INSTADECIBEL CAMERA
• Real-time decibel data overlaid on camera feed
• Capture photos and videos with measurements burned into output
• Front/rear camera switching with auto-focus

◆ PROFESSIONAL REPORT EXPORT
• PDF detailed report (with timeline, distribution chart, configuration info)
• PNG high-resolution screenshot (social sharing)
• CSV raw data (Excel / Numbers analysis)

◆ NOISE ALERTS & PROTECTION
• Custom dB threshold alerts (vibration + flash + push notification)
• Auto-trigger recording 10 seconds before and after
• Decibel reference guide (0-140 dB noise level descriptions)

◆ MORE FEATURES
• Recording history management with audio playback
• GPS location tagging for measurements
• Dark / Light theme
• Background continuous monitoring
• 21 languages supported

Reference Standards: IEC 61672 / ANSI S1.4
Data Security: All measurement data is stored only on your device

Terms of Use: https://tootoostudio.github.io/decibellab-legal/terms-of-use.html
Privacy Policy: https://tootoostudio.github.io/decibellab-legal/privacy-policy.html

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| PRO Annual | $14.99 | per year |

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| PRO 终身版 | $19.99 | one-time |



## Version history (last 2 releases)

### 1.0.1 — 2026-04-02

• Background continuous monitoring support
• Various bug fixes

### 1.0.0 — 2026-03-31

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 2026-07-10.*