# AiAlmace vs Decibel

The clearest difference is in-app purchases: AiAlmace at none against Decibel's 4. AiAlmace also leads on ads (none vs shown). Decibel's advantage is update cadence (every 9 days vs every 28 months) and iOS requirement (13.0 vs 15.0). On price and device support there is nothing between them.

Both are free to download. Decibel sells 4 one-off in-app purchases. AiAlmace asks for nothing beyond the download.

AiAlmace ships an update every 28 months, Decibel every 9 days. The most recent releases landed on October 21, 2026 and October 29, 2026 respectively.

## The numbers

| Metric | AiAlmace | Decibel |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.7 (298 ratings)](https://appshunter.io/ios/app/decibel-noise-testing-artifact/id1470054262/reviews)** |
| Number of ratings | — | **298** |
| Positive reviews | — | 75.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 28 months | **Every 9 days** |
| Monetization | — | Free with in-app purchases |
| Size | 94 MB | 7 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Hitoshi Ogurisu](https://appshunter.io/developer/1082244077) | [文智 洪](https://appshunter.io/developer/775738991) |

## What reviewers say

### AiAlmace

[App page](https://appshunter.io/ios/app/aialmace/id1090773759)

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

**In-app purchases:** none


### Decibel

[App page](https://appshunter.io/ios/app/decibel-noise-testing-artifact/id1470054262)

This application offers noise detection and measurement capabilities, providing reference data for sound levels anytime, anywhere. It also includes location tagging for detection points and allows for the export of audio files for sharing. While it aims for accuracy, it is intended for private reference and cannot fully replace professional equipment.

**Highlights:** Noise detection, Reference measurement data, Detection point location, Audio file export, Private reference tool

**Features:** Vision Pro support

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Small Support | $0.99 | one-time |
| Ad removal service. | $1.99 | one-time |
| Warm Support | $2.99 | one-time |
| Generous Support | $4.99 | one-time |


## Frequently asked questions

### Is AiAlmace free?

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

### Is Decibel free?

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

### Do AiAlmace or Decibel have ads?

Decibel shows ads; AiAlmace does not.

### Which is updated more often, AiAlmace or Decibel?

AiAlmace ships an update every 28 months, and Decibel every 9 days. Most recently, AiAlmace was updated on October 21, 2026 and Decibel on October 29, 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.*