# CJDecibel vs FiberMap

The clearest difference is ads: FiberMap at none against CJDecibel's shown. CJDecibel's advantage is iOS requirement (11.0 vs 15.0). On price, update cadence, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

CJDecibel ships an update weekly, FiberMap fortnightly. Both last shipped on October 24, 2026.

## The numbers

| Metric | CJDecibel | FiberMap |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/cjdecibel-noise-detection/id6479873232/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | **Weekly** | Fortnightly |
| Monetization | Ad-supported | — |
| Size | 37 MB | 76 MB |
| Requires iOS | **11.0** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [炽金 练](https://appshunter.io/developer/1523269489) | [Jaze Networks](https://appshunter.io/developer/1492907012) |

## 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


### FiberMap

[App page](https://appshunter.io/ios/app/fibermap/id6764066472)

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

**In-app purchases:** none


## Frequently asked questions

### Is CJDecibel free?

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

### Is FiberMap free?

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

### Do CJDecibel or FiberMap have ads?

CJDecibel shows ads; FiberMap does not.

### Which is updated more often, CJDecibel or FiberMap?

CJDecibel ships an update weekly, and FiberMap fortnightly. Most recently, CJDecibel was updated on October 24, 2026 and FiberMap 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.*