# Chemicastle vs Atom Worldbox

The clearest difference is in-app purchases: Chemicastle at none against Atom Worldbox's 1. Chemicastle also leads on ads (none vs shown). Atom Worldbox's advantage is update cadence (every 2 days vs every 4 months). On price, device support and iOS requirement there is nothing between them.

Both are free to download. Atom Worldbox sells 1 one-off in-app purchase. Chemicastle asks for nothing beyond the download.

Chemicastle ships an update every 4 months, Atom Worldbox every 2 days. The most recent releases landed on September 8, 2026 and September 22, 2026 respectively.

## The numbers

| Metric | Chemicastle | Atom Worldbox |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 4 months | **Every 2 days** |
| Size | 301 MB | 22 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 9+ | 4+ |
| Developer | [Haute ecole pedagogique HEP-BEJUNE](https://appshunter.io/developer/1835648343) | [GEOCO YAZILIM ANONIM SIRKETI](https://appshunter.io/developer/6782131734) |

## What reviewers say

### Chemicastle

[App page](https://appshunter.io/ios/app/chemicastle/id6753705536)

**Features:** macOS Compatibility

**In-app purchases:** none


### Atom Worldbox

[App page](https://appshunter.io/ios/app/atom-worldbox/id6782131732)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Atom Worldbox Pro | $1.99 | one-time |


## Frequently asked questions

### Is Chemicastle free?

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

### Is Atom Worldbox free?

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

### Do Chemicastle or Atom Worldbox have ads?

Atom Worldbox shows ads; Chemicastle does not.

### Which is updated more often, Chemicastle or Atom Worldbox?

Chemicastle ships an update every 4 months, and Atom Worldbox every 2 days. Most recently, Chemicastle was updated on September 8, 2026 and Atom Worldbox 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.*