# Decibel Meter Noise DB Reader vs GNOS·AI

The clearest difference is in-app purchases: GNOS·AI at none against Decibel Meter Noise DB Reader's 2. Decibel Meter Noise DB Reader's advantage is update cadence (every 2 days vs every 11 days). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Decibel Meter Noise DB Reader sells 2 in-app purchases, starting at $7.99 per 7 days. GNOS·AI asks for nothing beyond the download.

Decibel Meter Noise DB Reader ships an update every 2 days, GNOS·AI every 11 days. The most recent releases landed on October 24, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | Decibel Meter Noise DB Reader | GNOS·AI |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.0 (19 ratings)](https://appshunter.io/ios/app/decibel-meter-noise-db-reader/id6745509102/reviews)** | — |
| Number of ratings | **19** | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 2 days** | Every 11 days |
| Monetization | Free with in-app purchases | — |
| Size | 26 MB | 96 MB |
| Requires iOS | 16.0 | **15.0** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 12+ |
| Developer | [Elizabeth Black](https://appshunter.io/developer/1823167549) | [CISUMVERSE TECHNOLOGY LIMITED](https://appshunter.io/developer/1846771690) |

## What reviewers say

### Decibel Meter Noise DB Reader

[App page](https://appshunter.io/ios/app/decibel-meter-noise-db-reader/id6745509102)

Transform your device into a professional sound analysis tool. Measure real-time noise levels, analyze frequencies, and generate various sound waves for audio testing and instrument tuning. Save and share your acoustic reports.

**Highlights:** Real-time decibel monitoring, Advanced frequency analyzer, Multi-wave sound generator, Musical note library, Save and share reports

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Decibel Meter 1 week | $7.99 | per 7 days |
| Decibel Meter 1 month | $19.99 | per month |


### GNOS·AI

[App page](https://appshunter.io/ios/app/gnosai/id6769667631)

**In-app purchases:** none


## Frequently asked questions

### Is Decibel Meter Noise DB Reader free?

Decibel Meter Noise DB Reader is free to download, with in-app purchases available.

### Is GNOS·AI free?

GNOS·AI is free to download, with no in-app purchases.

### Do Decibel Meter Noise DB Reader or GNOS·AI have ads?

Neither Decibel Meter Noise DB Reader nor GNOS·AI shows ads.

### Which is updated more often, Decibel Meter Noise DB Reader or GNOS·AI?

Decibel Meter Noise DB Reader ships an update every 2 days, and GNOS·AI every 11 days. Most recently, Decibel Meter Noise DB Reader was updated on October 24, 2026 and GNOS·AI on October 9, 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.*