# Decibel：db Sound Meter vs Scan QR Code

The clearest difference is ads: Decibel：db Sound Meter at none against Scan QR Code's shown. Scan QR Code's advantage is update cadence (monthly vs every 9 months). On price, in-app purchases, device support and iOS requirement there is nothing between them.

Both are free to download. Decibel：db Sound Meter sells 3 in-app purchases, starting at $3.99 per 7 days and Scan QR Code sells 3 in-app purchases, starting at $6.99 per 7 days. Whichever you choose, the download price is not the number that matters.

Decibel：db Sound Meter ships an update every 9 months, Scan QR Code monthly. The most recent releases landed on October 12, 2026 and September 27, 2026 respectively.

## The numbers

| Metric | Decibel：db Sound Meter | Scan QR Code |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 8.3% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 9 months | **Monthly** |
| Monetization | Freemium | — |
| Size | 27 MB | 100 MB |
| Requires iOS | 13.0 | **12.0** |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 9+ | 9+ |
| Developer | [Qinghe Net LLC](https://appshunter.io/developer/1780821316) | [Guangzhou Fun network technology Co., LTD](https://appshunter.io/developer/1749225910) |

## What reviewers say

### Decibel：db Sound Meter

[App page](https://appshunter.io/ios/app/decibeldb-sound-meter/id6740468843)

Measure noise levels accurately with this practical tool. It offers real-time decibel monitoring, photo and video recording with decibel watermarks, and downloadable reports for easy noise management.

**Highlights:** Real-time decibel monitoring, Photo recording with decibel watermark, Real-time video recording, Downloadable monitoring reports, Detailed decibel detection records

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Members | $3.99 | per 7 days |
| Monthly Membership | $5.99 | per month |
| Annual Membership | $14.99 | per year |


### Scan QR Code

[App page](https://appshunter.io/ios/app/scan-qr-code-qr-code-reader/id6744961133)

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly member | $6.99 | per 7 days |
| Monthly member | $5.99 | one-time |
| Annual member | $14.99 | one-time |


## Frequently asked questions

### Is Decibel：db Sound Meter free?

Decibel：db Sound Meter is free to download, with in-app purchases available.

### Is Scan QR Code free?

Scan QR Code is free to download, with in-app purchases available.

### Do Decibel：db Sound Meter or Scan QR Code have ads?

Scan QR Code shows ads; Decibel：db Sound Meter does not.

### Which is updated more often, Decibel：db Sound Meter or Scan QR Code?

Decibel：db Sound Meter ships an update every 9 months, and Scan QR Code monthly. Most recently, Decibel：db Sound Meter was updated on October 12, 2026 and Scan QR Code on September 27, 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.*