# Expert PRO vs Decibels

The clearest difference is in-app purchases: Expert PRO at none against Decibels's 1. Expert PRO also leads on update cadence (every 4 months vs every 30 months) and iOS requirement (8.0 vs 17.0). On price, ads and device support there is nothing between them.

Both are free to download. Decibels sells 1 in-app purchase, starting at $3.99 per month. Expert PRO asks for nothing beyond the download.

Expert PRO ships an update every 4 months, Decibels every 30 months. The most recent releases landed on October 26, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Expert PRO | Decibels |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.3 (22 ratings)](https://appshunter.io/ios/app/decibels-sound-level-db-meter/id1590741461/reviews)** |
| Number of ratings | — | **22** |
| Positive reviews | — | 22.2% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 4 months** | Every 30 months |
| Monetization | — | Free with in-app purchases |
| Size | 17 MB | 20 MB |
| Requires iOS | **8.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Expert Electronics Comercio e Fabricacao de Produtos Eletronicos Ltda](https://appshunter.io/developer/1103488615) | [Real Vision Ltd](https://appshunter.io/developer/1447773149) |

## What reviewers say

### Expert PRO

[App page](https://appshunter.io/ios/app/expert-pro/id1491565979)

**Features:** macOS Compatibility

**In-app purchases:** none


### Decibels

[App page](https://appshunter.io/ios/app/decibels-sound-level-db-meter/id1590741461)

Measure sound levels in decibels using your device's microphone. View real-time graphs and historical data to detect noise pollution and protect your hearing. Calibrate for accurate readings across various environments.

**Highlights:** Measures sound in decibels (dB), Displays sound samples on a graph, Detects loud and low environmental noise, Calibrated for accuracy, Shows min/avg/max decibel values, Saves data and view history, Calibrates decibel for each device

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| dB Meter Full App Access | $3.99 | per month |


## Frequently asked questions

### Is Expert PRO free?

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

### Is Decibels free?

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

### Do Expert PRO or Decibels have ads?

Neither Expert PRO nor Decibels shows ads.

### Which is updated more often, Expert PRO or Decibels?

Expert PRO ships an update every 4 months, and Decibels every 30 months. Most recently, Expert PRO was updated on October 26, 2026 and Decibels on October 24, 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.*