# Chemtrix vs AstroBrain Space Program

The clearest difference is update cadence: Chemtrix at weekly against AstroBrain Space Program's fortnightly. Chemtrix also leads on iOS requirement (13.0 vs 15.1). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Chemtrix sells 1 one-off in-app purchase and AstroBrain Space Program sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Chemtrix ships an update weekly, AstroBrain Space Program fortnightly. The most recent releases landed on August 22, 2026 and September 14, 2026 respectively.

## The numbers

| Metric | Chemtrix | AstroBrain Space Program |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (95 ratings)](https://appshunter.io/ios/app/chemtrix/id1439593064/reviews)** | — |
| Number of ratings | **95** | — |
| Positive reviews | 52.1% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Weekly** | Fortnightly |
| Monetization | Free with in-app purchases | — |
| Size | 23 MB | 24 MB |
| Requires iOS | **13.0** | 15.1 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Sam Woolf](https://appshunter.io/developer/1439593063) | [Francisco Javier Rodriguez Donado](https://appshunter.io/developer/1778534980) |

## What reviewers say

### Chemtrix

[App page](https://appshunter.io/ios/app/chemtrix/id1439593064)

A puzzle game where you build molecules by bonding atoms. Progress through levels, discover atomic secrets, and explore molecular structures. Features a free fall mode for continuous molecule building.

**Highlights:** Build molecules by bonding atoms, 24 challenging levels, Free fall mode for continuous play, Learn atomic bonding and molecular structures, Features Lewis-dot notation, Accurate energy calculations

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock Chemtrix | $0.99 | one-time |


### AstroBrain Space Program

[App page](https://appshunter.io/ios/app/astrobrain-space-program/id6737922303)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| AstroBrain Pro | $2.99 | one-time |


## Frequently asked questions

### Is Chemtrix free?

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

### Is AstroBrain Space Program free?

AstroBrain Space Program is free to download, with in-app purchases available.

### Do Chemtrix or AstroBrain Space Program have ads?

Neither Chemtrix nor AstroBrain Space Program shows ads.

### Which is updated more often, Chemtrix or AstroBrain Space Program?

Chemtrix ships an update weekly, and AstroBrain Space Program fortnightly. Most recently, Chemtrix was updated on August 22, 2026 and AstroBrain Space Program on September 14, 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.*