# Petri vs Joy Square

The clearest difference is ads: Joy Square at none against Petri's shown. Petri's advantage is update cadence (weekly vs every 2 months) and ratings volume (34 vs 7). On price, rating, review sentiment and in-app purchases there is nothing between them.

Both are free to download. Petri sells 1 one-off in-app purchase and Joy Square sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

On the App Store both sit at effectively the same score — 5.0 for Petri against 4.9 for Joy Square. Both are backed by a comparable volume of ratings — 34 and 7 respectively. Written reviews split almost evenly too, at 100% and 100% positive.

Petri ships an update weekly, Joy Square every 2 months. The most recent releases landed on October 24, 2026 and September 30, 2026 respectively.

## The numbers

| Metric | Petri | Joy Square |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (34 ratings)](https://appshunter.io/ios/app/petri-blobs-from-space/id1518031837/reviews)** | [4.9 (7 ratings)](https://appshunter.io/ios/app/joy-square/id1563429096/reviews) |
| Number of ratings | **34** | 7 |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | **Weekly** | Every 2 months |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 65 MB | 15 MB |
| Requires iOS | **12.0** | 14.4 |
| Devices | iPhone, iPad, iPod, Apple Watch | iPhone, iPad, iPod, Apple Watch |
| Age rating | 9+ | 4+ |
| Developer | [Beep Yeah!](https://appshunter.io/developer/1481351052) | [Alexander Fedoseev](https://appshunter.io/developer/1460449487) |

## What reviewers say

### Petri

[App page](https://appshunter.io/ios/app/petri-blobs-from-space/id1518031837)

Engage in a relaxing puzzle game by matching colorful alien blobs to clear the screen. Explore three distinct game modes, including timed challenges and an endless mode for a casual experience. Playable on various Apple devices, including Apple Watch.

**Highlights:** Match alien blobs by color, Blast black blobs, Arcade mode (timed), Daily puzzle challenge, Endless mode (no time limit), Apple Watch support

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $2.99 | one-time |


### Joy Square

[App page](https://appshunter.io/ios/app/joy-square/id1563429096)

A puzzle game designed to enhance your attention span by challenging you to locate and track a solid square against the clock. Compete globally for high scores and enjoy a fun, engaging experience. A premium version offers additional content and features.

**Highlights:** Attention improvement, Locate and track solid squares, Timed gameplay for maximum points, Global leaderboard competition, Playable on iPhone, iPad, and Apple Watch, Complete level packs (Premium)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Access | $0.99 | one-time |


## Frequently asked questions

### Is Petri free?

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

### Is Joy Square free?

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

### Which has better reviews, Petri or Joy Square?

Petri is rated higher. Petri averages 5.0 out of 5 from 34 ratings, while Joy Square averages 4.9 from 7 ratings.

### Do Petri or Joy Square have ads?

Petri shows ads; Joy Square does not.

### Which is updated more often, Petri or Joy Square?

Petri ships an update weekly, and Joy Square every 2 months. Most recently, Petri was updated on October 24, 2026 and Joy Square on September 30, 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.*