# Krun vs Spinertia

The clearest difference is rating: Spinertia at 5.0 against Krun's 3.0. Spinertia also leads on in-app purchases (none vs 1) and ads (none vs shown). Krun's advantage is update cadence (every 3 days vs every 6 days) and device support (3 vs 1). On price, ratings volume and iOS requirement there is nothing between them.

Both are free to download. Krun sells 1 one-off in-app purchase. Spinertia asks for nothing beyond the download.

Spinertia holds the better App Store score, 5.0 against 3.0. Both are backed by a comparable volume of ratings — 2 and 1 respectively.

Krun ships an update every 3 days, Spinertia every 6 days. Both last shipped on October 31, 2026.

## The numbers

| Metric | Krun | Spinertia |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.0 (2 ratings)](https://appshunter.io/ios/app/krun-spinner/id6757863339/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/spinertia-fidget-spinner/id6801567304/reviews)** |
| Number of ratings | **2** | 1 |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Every 3 days** | Every 6 days |
| Monetization | Free with in-app purchases | **Free** |
| Size | 6 MB | 3 MB |
| Requires iOS | 16.6 | **16.0** |
| Devices | **iPhone, iPad, Apple Watch** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Shinichiro Eto](https://appshunter.io/developer/1864675097) | [一聪 张](https://appshunter.io/developer/6800539782) |

## 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 |


### Spinertia

[App page](https://appshunter.io/ios/app/spinertia-fidget-spinner/id6801567304)

Experience a realistic digital fidget spinner with responsive haptics and dynamic sound. Control your spins with flicks, track performance metrics, and enjoy a distraction-free Zen Mode. This app offers a private and offline experience.

**Highlights:** Realistic inertia and haptics, Dynamic sound effects, Motion control with iPhone movement, Customizable spin settings, Performance tracking (RPM, speed, time), Zen Mode for distraction-free play

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Krun free?

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

### Is Spinertia free?

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

### Which has better reviews, Krun or Spinertia?

Spinertia is rated higher. Krun averages 3.0 out of 5 from 2 ratings, while Spinertia averages 5.0 from 1 ratings.

### Do Krun or Spinertia have ads?

Krun shows ads; Spinertia does not.

### Which is updated more often, Krun or Spinertia?

Krun ships an update every 3 days, and Spinertia every 6 days. Most recently, Krun was updated on October 31, 2026 and Spinertia on October 31, 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.*