# Decibel Meter A+ vs Appknot Trace

The clearest difference is in-app purchases: Appknot Trace at none against Decibel Meter A+'s 3. Appknot Trace also leads on ads (none vs shown). Decibel Meter A+'s advantage is iOS requirement (15.0 vs 26.0). On price, update cadence and device support there is nothing between them.

Both are free to download. Decibel Meter A+ sells 3 one-off in-app purchases. Appknot Trace asks for nothing beyond the download.

Decibel Meter A+ ships an update every 6 weeks, Appknot Trace every 2 months. The most recent releases landed on October 24, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Decibel Meter A+ | Appknot Trace |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 89.5% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Every 6 weeks** | Every 2 months |
| Monetization | Free with in-app purchases | — |
| Size | 5 MB | 2 MB |
| Requires iOS | **15.0** | 26.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [BO YOUNG PARK](https://appshunter.io/developer/1291813217) | [Appknot](https://appshunter.io/developer/459436737) |

## What reviewers say

### Decibel Meter A+

[App page](https://appshunter.io/ios/app/decibel-meter-a-plus/id6450104699)

This app measures and analyzes environmental noise in real time, providing accurate dB levels and statistical data. It features a simple interface for detecting subtle noises, with recording and sharing capabilities to manage noise data effectively and promote a safer environment.

**Highlights:** Real-time dB level monitoring, Environmental noise analysis, Noise measurement recording, Data sharing capabilities, Intuitive user interface, Statistical data generation

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $0.99 | one-time |
| Coffee for App Developers | $1.99 | one-time |
| Coffee + Cake for App Devs | $3.99 | one-time |


### Appknot Trace

[App page](https://appshunter.io/ios/app/appknot-trace/id6786939396)

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

**In-app purchases:** none


## Frequently asked questions

### Is Decibel Meter A+ free?

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

### Is Appknot Trace free?

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

### Do Decibel Meter A+ or Appknot Trace have ads?

Decibel Meter A+ shows ads; Appknot Trace does not.

### Which is updated more often, Decibel Meter A+ or Appknot Trace?

Decibel Meter A+ ships an update every 6 weeks, and Appknot Trace every 2 months. Most recently, Decibel Meter A+ was updated on October 24, 2026 and Appknot Trace on October 31, 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.*