# Decibel Meter Plus Pro vs Smart Protractor & Angle Meter

The clearest difference is price: Smart Protractor & Angle Meter at Free against Decibel Meter Plus Pro's $2.99. Decibel Meter Plus Pro's advantage is chart position (#164 vs unranked) and iOS requirement (15.0 vs 17.6). On update cadence, ads, in-app purchases and device support there is nothing between them.

Smart Protractor & Angle Meter is free to download; Decibel Meter Plus Pro costs $2.99 up front. Decibel Meter Plus Pro sells 1 one-off in-app purchase and Smart Protractor & Angle Meter sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Decibel Meter Plus Pro ships an update every 2 months, Smart Protractor & Angle Meter every 6 weeks. Both last shipped on October 14, 2026.

## The numbers

| Metric | Decibel Meter Plus Pro | Smart Protractor & Angle Meter |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | **[3.8 (80 ratings)](https://appshunter.io/ios/app/decibel-meter-plus-pro/id645214476/reviews)** | — |
| Number of ratings | **80** | — |
| Positive reviews | 52.4% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 6 weeks** |
| Monetization | Paid | — |
| Best chart rank | **#164** | — |
| Size | 12 MB | 7 MB |
| Requires iOS | **15.0** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [华芳 张](https://appshunter.io/developer/586041482) | [Vladislav Zhirnov](https://appshunter.io/developer/1476188065) |

## What reviewers say

### Decibel Meter Plus Pro

[App page](https://appshunter.io/ios/app/decibel-meter-plus-pro/id645214476)

**Currently charting:** #164 Top Paid · Utilities (US App Store)

Measure the sound levels around you with this utility app. It displays average, peak, and max values, offers decibel exposure time guidelines, and provides information on noise-induced hearing loss. The app also allows data recording and export for analysis.

**Highlights:** Measure sound levels, Display average, peak, and max values, Decibel exposure time guidelines, Information on noise-induced hearing loss, Record and export data, Calibrate measurements, Universal app support

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlimited Reports | $4.99 | one-time |


### Smart Protractor & Angle Meter

[App page](https://appshunter.io/ios/app/smart-protractor-and-angle-meter/id6760594071)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full version | $2.99 | one-time |


## Frequently asked questions

### Is Decibel Meter Plus Pro free?

Decibel Meter Plus Pro costs $2.99, and also offers in-app purchases.

### Is Smart Protractor & Angle Meter free?

Smart Protractor & Angle Meter is free to download, with in-app purchases available.

### Do Decibel Meter Plus Pro or Smart Protractor & Angle Meter have ads?

Neither Decibel Meter Plus Pro nor Smart Protractor & Angle Meter shows ads.

### Which is updated more often, Decibel Meter Plus Pro or Smart Protractor & Angle Meter?

Decibel Meter Plus Pro ships an update every 2 months, and Smart Protractor & Angle Meter every 6 weeks. Most recently, Decibel Meter Plus Pro was updated on October 14, 2026 and Smart Protractor & Angle Meter on October 14, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*