# DMS2 vs Decibel：Sound Meter

The clearest difference is in-app purchases: DMS2 at none against Decibel：Sound Meter's 3. DMS2 also leads on ads (none vs shown). Decibel：Sound Meter's advantage is update cadence (every 11 days vs every 4 weeks). On price, device support and iOS requirement there is nothing between them.

Both are free to download. Decibel：Sound Meter sells 3 in-app purchases, starting at $3.99 per 7 days. DMS2 asks for nothing beyond the download.

DMS2 ships an update every 4 weeks, Decibel：Sound Meter every 11 days. The most recent releases landed on September 12, 2026 and October 3, 2026 respectively.

## The numbers

| Metric | DMS2 | Decibel：Sound Meter |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[3.8 (6 ratings)](https://appshunter.io/ios/app/decibelsound-meter/id6473146362/reviews)** |
| Number of ratings | — | **6** |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 4 weeks | **Every 11 days** |
| Monetization | — | Free with in-app purchases |
| Size | 112 MB | 33 MB |
| Requires iOS | **12.1** | 13.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 9+ |
| Developer | [Quest Data Inc](https://appshunter.io/developer/1532265125) | [ZHHUALIUON INC](https://appshunter.io/developer/1686696259) |

## What reviewers say

### DMS2

[App page](https://appshunter.io/ios/app/dms2/id1532265123)

**Features:** macOS Compatibility

**In-app purchases:** none


### Decibel：Sound Meter

[App page](https://appshunter.io/ios/app/decibelsound-meter/id6473146362)

This application offers real-time decibel measurements with high precision. It provides detailed reports, location data, and the ability to share or export audio measurements. Users can also utilize a real-time decibel camera feature.

**Highlights:** Real-time decibel measurement, High precision, Location data, Decibel camera, Measurement reports, Data sharing, Audio data export

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly membership | $3.99 | per 7 days |
| Monthly membership | $4.99 | per month |
| Annual membership | $14.99 | per year |


## Frequently asked questions

### Is DMS2 free?

DMS2 is free to download, with no in-app purchases.

### Is Decibel：Sound Meter free?

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

### Do DMS2 or Decibel：Sound Meter have ads?

Decibel：Sound Meter shows ads; DMS2 does not.

### Which is updated more often, DMS2 or Decibel：Sound Meter?

DMS2 ships an update every 4 weeks, and Decibel：Sound Meter every 11 days. Most recently, DMS2 was updated on September 12, 2026 and Decibel：Sound Meter on October 3, 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.*