# AcousticApp vs SLK

The clearest difference is in-app purchases: SLK at none against AcousticApp's 1. AcousticApp's advantage is iOS requirement (13.0 vs 15.6). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. AcousticApp sells 1 in-app purchase, starting at $0.99 per month. SLK asks for nothing beyond the download.

AcousticApp ships an update every 4 months, SLK every 2 months. The most recent releases landed on October 15, 2026 and October 17, 2026 respectively.

## The numbers

| Metric | AcousticApp | SLK |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 81.3% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 2 months** |
| Monetization | Free with in-app purchases | — |
| Size | 90 MB | 46 MB |
| Requires iOS | **13.0** | 15.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [objectiv GmbH & Co. KG](https://appshunter.io/developer/1121646876) | [Idwell GmbH](https://appshunter.io/developer/1269662593) |

## What reviewers say

### AcousticApp

[App page](https://appshunter.io/ios/app/acousticapp/id1121646877)

Measure and analyze sound and room acoustics with professional tools. Calculate reverberation time, simulate acoustic changes, and test your hearing. Optimize spaces with advanced features and personalized reports.

**Highlights:** Professional sound and noise measurement (RTA), Reverberation time calculation and evaluation, Acoustic simulation before/after optimization, Hearing ability test across frequency ranges, Room acoustics calculation with user-defined absorbers, Personalized report generation

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Acoustic App Pro Version | $0.99 | per month |


### SLK

[App page](https://appshunter.io/ios/app/slk/id6448578911)

**In-app purchases:** none


## Frequently asked questions

### Is AcousticApp free?

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

### Is SLK free?

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

### Do AcousticApp or SLK have ads?

Neither AcousticApp nor SLK shows ads.

### Which is updated more often, AcousticApp or SLK?

AcousticApp ships an update every 4 months, and SLK every 2 months. Most recently, AcousticApp was updated on October 15, 2026 and SLK on October 17, 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.*