# MappasApp vs Decibel Meter

The clearest difference is in-app purchases: MappasApp at none against Decibel Meter's 2. MappasApp also leads on ads (none vs shown). Decibel Meter's advantage is device support (3 vs 1). On price, update cadence and iOS requirement there is nothing between them.

Both are free to download. Decibel Meter sells 2 in-app purchases, starting at $0.99 per month. MappasApp asks for nothing beyond the download.

MappasApp ships an update every 4 weeks, Decibel Meter every 3 weeks. The most recent releases landed on October 26, 2026 and October 29, 2026 respectively.

## The numbers

| Metric | MappasApp | Decibel Meter |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.3 (222 ratings)](https://appshunter.io/ios/app/decibel-meter-sound-meter/id1373636871/reviews)** |
| Number of ratings | — | **222** |
| Positive reviews | — | 40.5% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 4 weeks | **Every 3 weeks** |
| Monetization | — | Free with in-app purchases |
| Size | 2 MB | 51 MB |
| Requires iOS | **15.0** | 16.0 |
| Devices | iPad | **iPhone, iPad, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [Mappasystems](https://appshunter.io/developer/934936737) | [MYSTIC MOBILE APPS LLC](https://appshunter.io/developer/1481942662) |

## What reviewers say

### MappasApp

[App page](https://appshunter.io/ios/app/mappasapp/id934936738)

**Features:** macOS Compatibility

**In-app purchases:** none


### Decibel Meter

[App page](https://appshunter.io/ios/app/decibel-meter-sound-meter/id1373636871)

Transform your smartphone into a precise sound measuring device. This app uses your phone's microphone to display real-time decibel levels with clear descriptions. Analyze sound over time, calibrate for accuracy, and share your findings easily.

**Highlights:** Real-time decibel measurement, Min, average, and max sound levels, Apple Watch integration, Customizable calibration, Data sharing (CSV, screenshots), Historical data tracking, Cloud data storage

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Sound Meter+ | $0.99 | per month |
| Annual Sound Meter+ | $5.99 | per year |


## Frequently asked questions

### Is MappasApp free?

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

### Is Decibel Meter free?

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

### Do MappasApp or Decibel Meter have ads?

Decibel Meter shows ads; MappasApp does not.

### Which is updated more often, MappasApp or Decibel Meter?

MappasApp ships an update every 4 weeks, and Decibel Meter every 3 weeks. Most recently, MappasApp was updated on October 26, 2026 and Decibel Meter on October 29, 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.*