# Krun vs The Modern Devil's Dictionary

The clearest difference is in-app purchases: The Modern Devil's Dictionary at none against Krun's 1. On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Krun sells 1 one-off in-app purchase. The Modern Devil's Dictionary asks for nothing beyond the download.

Both ship on a similar rhythm, roughly every 3 days. The most recent releases landed on October 9, 2026 and October 16, 2026 respectively.

## The numbers

| Metric | Krun | The Modern Devil's Dictionary |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[1.0 (1 ratings)](https://appshunter.io/ios/app/krun-spinner/id6757863339/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | Yes |
| Update frequency | Every 3 days | Every 3 days |
| Monetization | Free with in-app purchases | — |
| Size | 6 MB | 58 MB |
| Requires iOS | 16.6 | **16.4** |
| Devices | **iPhone, iPad, Apple Watch** | iPhone, iPad |
| Age rating | 4+ | 9+ |
| Developer | [Shinichiro Eto](https://appshunter.io/developer/1864675097) | [GEN MASUBUCHI](https://appshunter.io/developer/1875889647) |

## What reviewers say

### Krun

[App page](https://appshunter.io/ios/app/krun-spinner/id6757863339)

Engage with a digital pinwheel that creates captivating optical illusions as it spins and slows. Customize shapes, colors, and speed for a unique visual experience. It's a simple yet mesmerizing tool for all ages.

**Highlights:** Swipe-to-spin pinwheels, Illusions appear as rotation slows, Shape, color, and speed customization, Unlock all content, Remove ads

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Unlock | $2.99 | one-time |


### The Modern Devil's Dictionary

[App page](https://appshunter.io/ios/app/the-modern-devils-dictionary/id6759857423)

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

**In-app purchases:** none


## Frequently asked questions

### Is Krun free?

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

### Is The Modern Devil's Dictionary free?

The Modern Devil's Dictionary is free to download, with no in-app purchases.

### Do Krun or The Modern Devil's Dictionary have ads?

Both Krun and The Modern Devil's Dictionary show ads.

### Which is updated more often, Krun or The Modern Devil's Dictionary?

Krun ships an update every 3 days, and The Modern Devil's Dictionary every 3 days. Most recently, Krun was updated on October 9, 2026 and The Modern Devil's Dictionary on October 16, 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.*