# Machine Elements 3D vs Kayf

The clearest difference is in-app purchases: Machine Elements 3D at none against Kayf's 1. Machine Elements 3D also leads on update cadence (every 2 days vs every 5 days). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Kayf sells 1 one-off in-app purchase. Machine Elements 3D asks for nothing beyond the download.

Machine Elements 3D ships an update every 2 days, Kayf every 5 days. The most recent releases landed on September 21, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | Machine Elements 3D | Kayf |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 2 days** | Every 5 days |
| Size | 53 MB | 18 MB |
| Requires iOS | 18.5 | **18.0** |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Alexander Kutsybala](https://appshunter.io/developer/1579171695) | [Tariq Al-aqrabawi](https://appshunter.io/developer/1877383192) |

## What reviewers say

### Machine Elements 3D

[App page](https://appshunter.io/ios/app/machine-elements-3d/id6804215914)

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

**In-app purchases:** none


### Kayf

[App page](https://appshunter.io/ios/app/kayf-how-things-work/id6813402468)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Kayf Pro | $4.99 | one-time |


## Frequently asked questions

### Is Machine Elements 3D free?

Machine Elements 3D is free to download, with no in-app purchases.

### Is Kayf free?

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

### Do Machine Elements 3D or Kayf have ads?

Neither Machine Elements 3D nor Kayf shows ads.

### Which is updated more often, Machine Elements 3D or Kayf?

Machine Elements 3D ships an update every 2 days, and Kayf every 5 days. Most recently, Machine Elements 3D was updated on September 21, 2026 and Kayf on October 9, 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.*