# klang² vs Laser Microscopy Quiz

The clearest difference is in-app purchases: Laser Microscopy Quiz at none against klang²'s 10. klang²'s advantage is update cadence (every 2 months vs every 5 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. klang² sells 10 one-off in-app purchases. Laser Microscopy Quiz asks for nothing beyond the download.

klang² ships an update every 2 months, Laser Microscopy Quiz every 5 months. The most recent releases landed on October 18, 2026 and September 19, 2026 respectively.

## The numbers

| Metric | klang² | Laser Microscopy Quiz |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 5 months |
| Size | 89 MB | 89 MB |
| Requires iOS | 15.6 | **14.2** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Oberlin & Rennertz GmbH](https://appshunter.io/developer/1474108830) | [Toptica Photonics AG](https://appshunter.io/developer/919586983) |

## What reviewers say

### klang²

[App page](https://appshunter.io/ios/app/klang/id1491987376)

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Klang2 Pro Option 0 | Free | one-time |
| Klang2 Pro Option 1 | $0.99 | one-time |
| Bundesländer und Hauptstädte | $0.99 | one-time |
| Klang2 Pro Option 2 | $1.99 | one-time |
| Klang2 Pro Option 3 | $3.99 | one-time |
| Volkslieder Premium | $3.99 | one-time |
| Tierisch Menschlich | $3.99 | one-time |
| Klang2 Pro Option 4 | $7.99 | one-time |
| Klang2 Pro Option 5 | $11.99 | one-time |
| Klang2 Pro Option 6 | $16.99 | one-time |


### Laser Microscopy Quiz

[App page](https://appshunter.io/ios/app/laser-microscopy-quiz/id6472795832)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is klang² free?

klang² is free to download, with in-app purchases available.

### Is Laser Microscopy Quiz free?

Laser Microscopy Quiz is free to download, with no in-app purchases.

### Do klang² or Laser Microscopy Quiz have ads?

Neither klang² nor Laser Microscopy Quiz shows ads.

### Which is updated more often, klang² or Laser Microscopy Quiz?

klang² ships an update every 2 months, and Laser Microscopy Quiz every 5 months. Most recently, klang² was updated on October 18, 2026 and Laser Microscopy Quiz on September 19, 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.*