# Hellfish Parallels vs Letter Cubes

The clearest difference is ads: Hellfish Parallels at none against Letter Cubes's shown. Letter Cubes's advantage is iOS requirement (15.0 vs 18.4). On price, update cadence, in-app purchases and device support there is nothing between them.

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

Hellfish Parallels ships an update every 5 days, Letter Cubes every 4 days. The most recent releases landed on September 28, 2026 and September 30, 2026 respectively.

## The numbers

| Metric | Hellfish Parallels | Letter Cubes |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[3.3 (3 ratings)](https://appshunter.io/ios/app/letter-cubes/id6760427086/reviews)** |
| Number of ratings | — | **3** |
| Positive reviews | — | 33.3% of reviews |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 5 days | **Every 4 days** |
| Monetization | — | Ad-supported |
| Size | 17 MB | 205 MB |
| Requires iOS | 18.4 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 12+ | 12+ |
| Developer | [Wolfe John Maykut](https://appshunter.io/developer/1812221135) | [Fat Cat With a Hat](https://appshunter.io/developer/1847966967) |

## What reviewers say

### Hellfish Parallels

[App page](https://appshunter.io/ios/app/hellfish-parallels/id6746019288)

**Features:** macOS Compatibility

**In-app purchases:** none


### Letter Cubes

[App page](https://appshunter.io/ios/app/letter-cubes/id6760427086)

Combine letter blocks to form words in this relaxing puzzle game. Each level offers visual clues to guide you through satisfying challenges. Enjoy a calming experience that balances fun and focus.

**Highlights:** Combine letter blocks, Form correct words, Visual clues per level, Calming gameplay experience, Clear the board, Balance of fun and focus

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

**In-app purchases:** none


## Frequently asked questions

### Is Hellfish Parallels free?

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

### Is Letter Cubes free?

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

### Do Hellfish Parallels or Letter Cubes have ads?

Letter Cubes shows ads; Hellfish Parallels does not.

### Which is updated more often, Hellfish Parallels or Letter Cubes?

Hellfish Parallels ships an update every 5 days, and Letter Cubes every 4 days. Most recently, Hellfish Parallels was updated on September 28, 2026 and Letter Cubes 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.*