# Wonder Decibel - Sound Test — Decibel Meter

> Professional sound meter with noise classification, frequency weighting, and reporting. (iPhone/iPad app by 小利 薛.)

- Source: https://appshunter.io/ios/app/wonder-decibel-sound-test/id6757120222 (this page in markdown: same URL + `.md`)
- Developer: [小利 薛](https://appshunter.io/developer/1675817893)
- Category: Utilities, Productivity
- Price: Free with in-app purchases
- Rating: 5.00/5 from 2 App Store ratings · 5 written reviews indexed
- Age rating: 4+
- Requires: iOS 17.0 · 16 MB
- Languages: American English
- Released: 2026-01-10
- Data updated: 2026-09-06
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/wonder-decibel-sound-test/id6757120222/reviews.md

## What is Wonder Decibel?

Wonder Decibel is a professional iOS sound meter that combines high-precision acoustic measurement with smart analytics, making sound visible, measurable, and understandable. Whether for daily noise monitoring, acoustic research, sound field debugging, or education, it delivers intuitive operation and reliable data to satisfy your curiosity.

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**Professional Decibel Measurement with Three Flexible Modes**

Wonder Decibel offers three data collection methods: real-time monitoring, photo-based measurement, and video-based measurement, covering a wide range of use cases. The real-time mode is ideal for instant noise assessment, the photo mode freezes measurement results within captured images, and the video mode supports extended continuous recording for later review and verification. Whether dealing with sudden high-frequency spikes or persistent ambient background noise, you can quickly obtain accurate and dependable decibel readings.

**Multi-Result Correlation Analysis to Uncover Sound Variation Patterns**

By correlating and comparing measurement data from multiple sessions or different time points, the system automatically generates trend curves and fluctuation charts that clearly illustrate how sound intensity evolves over time. With multi-dimensional analytical tools including peak markings, average references, and time-segmented comparisons, you can extract critical insights from complex datasets and gain a deeper understanding of the underlying logic and patterns governing acoustic environments.

**Automated Inspection Reports with One-Tap Document Generation**

Based on collected measurement data, the system automatically produces professionally structured and visually clear inspection reports, covering measurement overviews, data charts, peak statistics, and trend analyses. Reports can be exported in standard formats for local archiving, email distribution, or print output, meeting the documentation requirements of formal scenarios such as project acceptance, environmental assessments, and academic record-keeping.

**AR-Enhanced Sound Hotspot Recognition**

Leveraging the augmented reality capabilities of iOS devices, Wonder Decibel visualizes sound decibel hotspots by overlaying them onto the real-world environment through the device screen. With a simple movement of your device, you can intuitively observe the spatial distribution of sound energy and quickly pinpoint noise-concentrated areas or anomalous sound sources. This feature proves especially valuable in scenarios such as conference room acoustic inspections, equipment noise diagnostics, and indoor acoustic layout optimization where spatial positioning is essential.

**Quiet Map – Location-Based Sound Detection**

Powered by GPS positioning, Wonder Decibel allows you to mark and record sound decibel values at different locations directly on a real map, building your personal sound map. Whether you are documenting noise distribution across urban neighborhoods, seeking out quiet corners within your daily surroundings, or tracking acoustic environment changes in specific areas, Quiet Map binds sound data with geographic information, transforming every outing into a meaningful acoustic data collection journey.

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**Subscription Service**

When you subscribe to the "VIP Subscription" service, you will enjoy the following benefits:
1. Unrestricted access to all features.
2. AI content recommendations based on usage habits.

Payment for subscriptions is straightforward—the user's iTunes account is credited immediately after confirmation of purchase and payment. Please note that the Apple iTunes account will be automatically debited 24 hours prior to expiration. Upon successful deduction, the subscription term will be extended by one subscription cycle.
User Agreement: https://www.wonderda.com/agreement.html
Privacy Agreement: https://www.wonderda.com/privacy.html

## Key features

- Noise Level Classification
- Multiple Frequency Weightings (dBA, dBC, dBZ)
- Triple Visualization System (Waveform, FFT, Spectrogram)
- Detailed Measurement Log with GPS
- Media Capture with Data Overlay
- Advanced Reporting Engine

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| VIP Subscription Service | $2.99 | per month |


## Recent user reviews (5 of 5)

All indexed reviews: https://appshunter.io/ios/app/wonder-decibel-sound-test/id6757120222/reviews.md

### 5/5 — Very stable app

*2026-02-28*

I've tried a few other sound meters and they often crash or freeze. Wonder Decibel has been rock solid on my iPhone. It's lightweight and doesn't seem to drain the battery much.

### 5/5 — Straightforward and easy

*2026-02-27*

No steep learning curve here. You just open the app and it starts measuring. I love that it gives you a reference, so you actually understand what the numbers mean.

### 5/5 — Beautiful and functional

*2026-02-26*

Most decibel apps look like they were designed in 2010, but Wonder Decibel is sleek and modern. It fits perfectly with the iOS aesthetic. I love the minimalist approach—it just works.

### 5/5 — Surprisingly accurate!

*2026-02-24*

I cọmpared this with a professional handheld decibel meter I use for work, and the results were remarkably close. The UI is clean, and there are no annoying ads popping up every second. Definitely my go-to sound meter now.

### 5/5 — Helpful for my sleep environment

*2026-02-11*

I live in a noisy neighborhood and wanted to see how loud it actually gets at night. This app is perfect for logging noise levels. It’s helped me realize when I need to turn on my white noise machine. Very handy tool.

## Frequently asked questions about Wonder Decibel

### What is Wonder Decibel?

Wonder Decibel is a utility app that turns your iPhone or iPad into a professional acoustic lab. It provides precise sound environment analysis, noise level classification, and detailed reporting features.

### What are the key measurement features of Wonder Decibel?

Wonder Decibel supports three essential frequency weightings: dBA for environmental and occupational noise, dBC for industrial and entertainment sound, and dBZ for peak impulse sounds. It also offers waveform display, FFT analysis, and spectrogram view.

### Can Wonder Decibel help with documentation?

Yes, Wonder Decibel features a Media Capture System to take photos and record videos with real-time sound levels displayed. It also has an Advanced Reporting Engine to generate comprehensive PDF reports with charts, graphs, and embedded media.

### Does Wonder Decibel have ads?

No, Wonder Decibel does not contain advertisements, offering an uninterrupted user experience.

### What devices is Wonder Decibel compatible with?

Wonder Decibel is available for iPhone and iPad devices.

### How does Wonder Decibel classify noise levels?

The app's intelligent Noise Level Classification feature translates raw decibel readings into meaningful categories, such as 'Quiet Library' or 'Hazardous Noise,' providing immediate, human-readable feedback on your acoustic environment.

### Is my measurement data saved in Wonder Decibel?

Yes, Wonder Decibel automatically creates a Detailed Measurement Log for each session, preserving GPS location, timestamps, duration, measurement type, environmental conditions, and custom notes. This history is accessible, searchable, and exportable.

### What is the age rating for Wonder Decibel?

Wonder Decibel has an age rating of 4+, making it suitable for a wide range of users.

## Version history (last 4 releases)

### 3.0 — 2026-08-24

Thanks for staying with us! In this version, you'll find:
1. New features
2. Fix bugs

### 2.1 — 2026-04-04

Thanks for staying with us! In this version, you'll find:
1. Compatible with the latest iOS system
2. Fix bugs

### 2.0 — 2026-01-29

Thanks for staying with us! In this version, you'll find:
1. Upgrade audio monitoring-related features
2. Fix bugs

### 1.0 — 2026-01-10

No release notes.

## Apps similar to Wonder Decibel

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| --- | --- | --- | --- |
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| [Decibel Meter: dB Sound Level](https://appshunter.io/ios/app/decibel-meter-db-sound-level/id6756241739) | 5.0 (2) | Free | Utilities |
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## More apps by 小利 薛

- [Wonder Shield - Call Filter](https://appshunter.io/ios/app/wonder-shield-call-filter/id6447752194)
- [Wonder Sleep - Sleepy Sounds](https://appshunter.io/ios/app/wonder-sleep-sleepy-sounds/id6747338147)
- [Wonder Quit - Smoke Free](https://appshunter.io/ios/app/wonder-quit-smoke-free/id6748075326)
- [Wonder Food - Healthy App](https://appshunter.io/ios/app/wonder-food-healthy-app/id6751926165)
- [Wonder TV - Control Samsung](https://appshunter.io/ios/app/wonder-tv-control-samsung/id6752973759)
- [Wonder Lock - Lock Apps](https://appshunter.io/ios/app/wonder-lock-lock-apps/id6753611058)

All apps by 小利 薛: https://appshunter.io/developer/1675817893

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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 2026-09-06.*