# Atom Structure vs Solar Journey

The clearest difference is price: Solar Journey at Free against Atom Structure's $1.99. Solar Journey also leads on update cadence (fortnightly vs every 41 months). Atom Structure's advantage is in-app purchases (none vs 1) and iOS requirement (12.0 vs 17.0). On ads and device support there is nothing between them.

Solar Journey is free to download; Atom Structure costs $1.99 up front. Solar Journey sells 1 one-off in-app purchase. Atom Structure asks for nothing beyond the download.

Atom Structure ships an update every 41 months, Solar Journey fortnightly. The most recent releases landed on November 3, 2026 and November 2, 2026 respectively.

## The numbers

| Metric | Atom Structure | Solar Journey |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 41 months | **Fortnightly** |
| Size | 232 MB | 601 MB |
| Requires iOS | **12.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [VIRTUAL FILAMENTS PRIVATE LIMITED](https://appshunter.io/developer/1474217212) | [方宇 周](https://appshunter.io/developer/395952569) |

## What reviewers say

### Atom Structure

[App page](https://appshunter.io/ios/app/atom-structure-edutech-era/id1637054844)

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

**In-app purchases:** none


### Solar Journey

[App page](https://appshunter.io/ios/app/solar-journey-space-flight/id6801833093)

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full Solar Navigation | $9.99 | one-time |


## Frequently asked questions

### Is Atom Structure free?

Atom Structure costs $1.99, with no in-app purchases.

### Is Solar Journey free?

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

### Do Atom Structure or Solar Journey have ads?

Neither Atom Structure nor Solar Journey shows ads.

### Which is updated more often, Atom Structure or Solar Journey?

Atom Structure ships an update every 41 months, and Solar Journey fortnightly. Most recently, Atom Structure was updated on November 3, 2026 and Solar Journey on November 2, 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.*