# Comprova vs Decibels

The clearest difference is in-app purchases: Comprova at none against Decibels's 1. Comprova also leads on update cadence (every 4 months vs every 30 months) and iOS requirement (15.1 vs 17.0). On price, review sentiment, 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. Comprova asks for nothing beyond the download.

Comprova ships an update every 4 months, Decibels every 30 months. The most recent releases landed on September 10, 2026 and September 26, 2026 respectively.

## The numbers

| Metric | Comprova | 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 | 14.3% of reviews | **22.2% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 4 months** | Every 30 months |
| Monetization | **Free** | Free with in-app purchases |
| Size | 33 MB | 20 MB |
| Requires iOS | **15.1** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Casa da Moeda do Brasil CMB](https://appshunter.io/developer/1513214434) | [Real Vision Ltd](https://appshunter.io/developer/1447773149) |

## What reviewers say

### Comprova

[App page](https://appshunter.io/ios/app/comprova/id1545167193)

This app provides a secure digital identification solution for professionals, allowing companies to issue digital documents with the same legal validity as physical ones. It features a time-coded QR code for validation and facilitates communication through notifications and file sharing.

**Highlights:** Secure digital identification, Time-coded QR code validation, Digital documents with legal validity, Receive notifications and files, Issued by Casa da Moeda do Brasil

**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 Comprova free?

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

### Is Decibels free?

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

### Do Comprova or Decibels have ads?

Neither Comprova nor Decibels shows ads.

### Which is updated more often, Comprova or Decibels?

Comprova ships an update every 4 months, and Decibels every 30 months. Most recently, Comprova was updated on September 10, 2026 and Decibels on September 26, 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.*