# Interactive Solar System vs Spin

The clearest difference is price: Spin at Free against Interactive Solar System's $1.99. Interactive Solar System's advantage is update cadence (fortnightly vs every 8 months) and iOS requirement (12.0 vs 15.0). On ads, in-app purchases and device support there is nothing between them.

Spin is free to download; Interactive Solar System costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Interactive Solar System ships an update fortnightly, Spin every 8 months. The most recent releases landed on October 5, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | Interactive Solar System | Spin |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Fortnightly** | Every 8 months |
| Size | 52 MB | 486 MB |
| Requires iOS | **12.0** | 15.0 |
| Devices | iPad, Apple TV | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Ventura Educational Systems](https://appshunter.io/developer/371324172) | [New Mexico State University Board of Regents](https://appshunter.io/developer/337567846) |

## What reviewers say

### Interactive Solar System

[App page](https://appshunter.io/ios/app/interactive-solar-system/id1240878228)

**Features:** macOS Compatibility

**In-app purchases:** none


### Spin

[App page](https://appshunter.io/ios/app/spin-n-move/id1470631675)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Interactive Solar System free?

Interactive Solar System costs $1.99, with no in-app purchases.

### Is Spin free?

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

### Do Interactive Solar System or Spin have ads?

Neither Interactive Solar System nor Spin shows ads.

### Which is updated more often, Interactive Solar System or Spin?

Interactive Solar System ships an update fortnightly, and Spin every 8 months. Most recently, Interactive Solar System was updated on October 5, 2026 and Spin 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.*