# Klangtester vs CalcKX

The clearest difference is in-app purchases: CalcKX at none against Klangtester's 4. CalcKX also leads on update cadence (every 4 days vs every 7 months). Klangtester's advantage is iOS requirement (12.0 vs 14.1). On price, ads and device support there is nothing between them.

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

Klangtester ships an update every 7 months, CalcKX every 4 days. The most recent releases landed on October 9, 2026 and October 17, 2026 respectively.

## The numbers

| Metric | Klangtester | CalcKX |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 7 months | **Every 4 days** |
| Size | 24 MB | 1 MB |
| Requires iOS | **12.0** | 14.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Klangspektrum GmbH - Institut fur naturliches HorErleben](https://appshunter.io/developer/1478150383) | [Martin Kowollik](https://appshunter.io/developer/1496665932) |

## What reviewers say

### Klangtester

[App page](https://appshunter.io/ios/app/klangtester/id1478150384)

**Features:** macOS Compatibility

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 10 Tickets | $2.99 | one-time |
| 100 Tickets | $19.99 | one-time |
| 500 Tickets | $74.99 | one-time |
| 1000 Tickets | $99.99 | one-time |


### CalcKX

[App page](https://appshunter.io/ios/app/calckx/id1583409123)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Klangtester free?

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

### Is CalcKX free?

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

### Do Klangtester or CalcKX have ads?

Neither Klangtester nor CalcKX shows ads.

### Which is updated more often, Klangtester or CalcKX?

Klangtester ships an update every 7 months, and CalcKX every 4 days. Most recently, Klangtester was updated on October 9, 2026 and CalcKX 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.*