# CJDecibel vs Decibel Check

The clearest difference is rating: CJDecibel at 5.0 against Decibel Check's 1.5. CJDecibel also leads on in-app purchases (none vs 2) and update cadence (weekly vs every 3 weeks). Decibel Check's advantage is ads (none vs shown). On price, ratings volume and device support there is nothing between them.

Both are free to download. Decibel Check sells 2 in-app purchases, starting at $1.99 per month. CJDecibel asks for nothing beyond the download.

CJDecibel holds the better App Store score, 5.0 against 1.5. Both are backed by a comparable volume of ratings — 2 and 2 respectively.

CJDecibel ships an update weekly, Decibel Check every 3 weeks. The most recent releases landed on November 4, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | CJDecibel | Decibel Check |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/cjdecibel-noise-detection/id6479873232/reviews)** | [1.5 (2 ratings)](https://appshunter.io/ios/app/decibel-check/id6503355419/reviews) |
| Number of ratings | 2 | 2 |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | **Weekly** | Every 3 weeks |
| Monetization | **Ad-supported** | Free with in-app purchases |
| Size | 37 MB | 35 MB |
| Requires iOS | **11.0** | 13.0 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [炽金 练](https://appshunter.io/developer/1523269489) | [Evo Tec Labs @ Pepperbit Online](https://appshunter.io/developer/1665371293) |

## What reviewers say

### CJDecibel

[App page](https://appshunter.io/ios/app/cjdecibel-noise-detection/id6479873232)

This utility app offers real-time, high-precision decibel measurements to detect noise levels. It features a minimalist interface for easy operation, allows recording of detection locations, and enables sharing or exporting of historical data.

**Highlights:** Real-time decibel measurement, High-precision detection, Location recording, Data sharing and export, Detection history viewing

**Features:** macOS Compatibility

**In-app purchases:** none


### Decibel Check

[App page](https://appshunter.io/ios/app/decibel-check/id6503355419)

Transform your smartphone into a precise sound level meter. Measure minimum, average, and maximum decibel levels with real-time visualizations and recording capabilities for detailed analysis. Gain insights into your auditory environment.

**Highlights:** Real-time Min, Avg, Max sound level measurement, Sound recording for analysis, Intuitive data visualizations, Clear and user-friendly interface, Precise sound measurements

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium MONTHLY | $1.99 | per month |
| Premium YEARLY | $9.99 | per year |


## Frequently asked questions

### Is CJDecibel free?

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

### Is Decibel Check free?

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

### Which has better reviews, CJDecibel or Decibel Check?

CJDecibel is rated higher. CJDecibel averages 5.0 out of 5 from 2 ratings, while Decibel Check averages 1.5 from 2 ratings.

### Do CJDecibel or Decibel Check have ads?

CJDecibel shows ads; Decibel Check does not.

### Which is updated more often, CJDecibel or Decibel Check?

CJDecibel ships an update weekly, and Decibel Check every 3 weeks. Most recently, CJDecibel was updated on November 4, 2026 and Decibel Check on October 30, 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.*