# Decibels vs Expert PROPlus

The clearest difference is in-app purchases: Expert PROPlus at none against Decibels's 1. Expert PROPlus also leads on update cadence (every 2 weeks vs every 30 months) and iOS requirement (12.0 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 PROPlus asks for nothing beyond the download.

Decibels ships an update every 30 months, Expert PROPlus every 2 weeks. The most recent releases landed on October 24, 2026 and October 27, 2026 respectively.

## The numbers

| Metric | Decibels | Expert PROPlus |
| --- | --- | --- |
| 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 | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 30 months | **Every 2 weeks** |
| Monetization | Free with in-app purchases | — |
| Size | 20 MB | 76 MB |
| Requires iOS | 17.0 | **12.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Real Vision Ltd](https://appshunter.io/developer/1447773149) | [Expert Electronics Comercio e Fabricacao de Produtos Eletronicos Ltda](https://appshunter.io/developer/1103488615) |

## What reviewers say

### 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 |


### Expert PROPlus

[App page](https://appshunter.io/ios/app/expert-proplus/id1634667153)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Decibels free?

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

### Is Expert PROPlus free?

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

### Do Decibels or Expert PROPlus have ads?

Neither Decibels nor Expert PROPlus shows ads.

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

Decibels ships an update every 30 months, and Expert PROPlus every 2 weeks. Most recently, Decibels was updated on October 24, 2026 and Expert PROPlus on October 27, 2026.

---

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