# Poly Rules! vs CrushStations

The clearest difference is review sentiment: Poly Rules! at 80% against CrushStations's 50%. Poly Rules! also leads on update cadence (monthly vs every 13 months) and rating (4.8 vs 4.5). On price, ratings volume, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Poly Rules! holds the better App Store score, 4.8 against 4.5. Both are backed by a comparable volume of ratings — 13 and 11 respectively. Written reviews point the same way: 80% of Poly Rules!'s written reviews are positive against 50% of CrushStations's.

Poly Rules! ships an update monthly, CrushStations every 13 months. The most recent releases landed on September 8, 2026 and September 22, 2026 respectively.

## The numbers

| Metric | Poly Rules! | CrushStations |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (13 ratings)](https://appshunter.io/ios/app/poly-rules/id1115877374/reviews)** | [4.5 (11 ratings)](https://appshunter.io/ios/app/crushstations/id1475914154/reviews) |
| Number of ratings | **13** | 11 |
| Positive reviews | **80.0% of reviews** | 50.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Monthly** | Every 13 months |
| Monetization | Free | Free |
| Size | 111 MB | 294 MB |
| Requires iOS | 12.0 | 12.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Northeastern University Information Services](https://appshunter.io/developer/455790172) | [New York University](https://appshunter.io/developer/485666462) |

## What reviewers say

### Poly Rules!

[App page](https://appshunter.io/ios/app/poly-rules/id1115877374)

A challenging sorting game where the rules dynamically change as you progress. It offers increasingly complex scenarios to test your cognitive abilities. Researchers can inquire about using the game for studies.

**Highlights:** Dynamic rule changes, Increasingly complex scenarios, Cognitive benefit focus, Research support available, Log storage and analytics (coming soon)

**Features:** macOS Compatibility

**In-app purchases:** none


### CrushStations

[App page](https://appshunter.io/ios/app/crushstations/id1475914154)

This game trains working memory, a key executive function, by challenging players to remember creature colors and types to rescue them from an octopus. It's designed to improve cognitive skills linked to academic success.

**Highlights:** Working memory training, Executive function development, Creature memory challenges, Educational game design, Research-backed gameplay

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Poly Rules! free?

Poly Rules! is free to download, with no in-app purchases.

### Is CrushStations free?

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

### Which has better reviews, Poly Rules! or CrushStations?

Poly Rules! is rated higher. Poly Rules! averages 4.8 out of 5 from 13 ratings, while CrushStations averages 4.5 from 11 ratings.

### Do Poly Rules! or CrushStations have ads?

Neither Poly Rules! nor CrushStations shows ads.

### Which is updated more often, Poly Rules! or CrushStations?

Poly Rules! ships an update monthly, and CrushStations every 13 months. Most recently, Poly Rules! was updated on September 8, 2026 and CrushStations on September 22, 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.*