# Grid Spin vs Pythagoras Interactive

The clearest difference is price: Pythagoras Interactive at Free against Grid Spin's $0.99. Pythagoras Interactive also leads on update cadence (every 2 weeks vs every 15 months). Grid Spin's advantage is iOS requirement (13.2 vs 16.0). On ads, in-app purchases and device support there is nothing between them.

Pythagoras Interactive is free to download; Grid Spin costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Grid Spin ships an update every 15 months, Pythagoras Interactive every 2 weeks. The most recent releases landed on May 14, 2026 and August 20, 2026 respectively.

## The numbers

| Metric | Grid Spin | Pythagoras Interactive |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/pythagoras-interactive/id6466731389/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 15 months | **Every 2 weeks** |
| Monetization | — | Free |
| Size | 16 MB | 1 MB |
| Requires iOS | **13.2** | 16.0 |
| Devices | iPad, Mac | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Ventura Educational Systems](https://appshunter.io/developer/371324172) | [ALAN PETERSON](https://appshunter.io/developer/1436516782) |

## What reviewers say

### Grid Spin

[App page](https://appshunter.io/ios/app/grid-spin-a-win/id1487990272)

**In-app purchases:** none


### Pythagoras Interactive

[App page](https://appshunter.io/ios/app/pythagoras-interactive/id6466731389)

Explore the Pythagorean Theorem with an interactive visual tool. Adjust triangle legs to observe real-time changes in square areas and hypotenuse length. Distances are displayed in radical form when necessary.

**Highlights:** Interactive triangle manipulation, Visual representation of squares on sides, Real-time updates to hypotenuse and areas, Radical form for distances, Clear labeling of sides and areas

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

**In-app purchases:** none


## Frequently asked questions

### Is Grid Spin free?

Grid Spin costs $0.99, with no in-app purchases.

### Is Pythagoras Interactive free?

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

### Do Grid Spin or Pythagoras Interactive have ads?

Neither Grid Spin nor Pythagoras Interactive shows ads.

### Which is updated more often, Grid Spin or Pythagoras Interactive?

Grid Spin ships an update every 15 months, and Pythagoras Interactive every 2 weeks. Most recently, Grid Spin was updated on May 14, 2026 and Pythagoras Interactive on August 20, 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.*