# Solar System Clock vs Heliosphere

The clearest difference is in-app purchases: Solar System Clock at none against Heliosphere's 3. Solar System Clock also leads on iOS requirement (16.6 vs 18.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Heliosphere sells 3 one-off in-app purchases. Solar System Clock asks for nothing beyond the download.

Solar System Clock ships an update every 2 days, Heliosphere every 3 days. The most recent releases landed on August 15, 2026 and August 28, 2026 respectively.

## The numbers

| Metric | Solar System Clock | Heliosphere |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[3.0 (2 ratings)](https://appshunter.io/ios/app/heliosphere-solar-system/id6757491622/reviews)** |
| Number of ratings | — | **2** |
| Positive reviews | — | 50.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 2 days** | Every 3 days |
| Monetization | — | Free |
| Size | 5 MB | 36 MB |
| Requires iOS | **16.6** | 18.0 |
| Devices | iPhone, iPad, Apple Watch | iPhone, iPad, Vision Pro |
| Age rating | 4+ | 4+ |
| Developer | [Mateusz Andrzejczuk](https://appshunter.io/developer/1158375886) | [CHUNGKIL KIM](https://appshunter.io/developer/960187999) |

## What reviewers say

### Solar System Clock

[App page](https://appshunter.io/ios/app/solar-system-clock/id6746730661)

**Features:** macOS Compatibility

**In-app purchases:** none


### Heliosphere

[App page](https://appshunter.io/ios/app/heliosphere-solar-system/id6757491622)

Explore a real-time 3D simulation of the solar system, planets, moons, and spacecraft using accurate astronomical data. Learn about celestial bodies and space missions with educational content and quizzes.

**Highlights:** Real-time 3D solar system simulation, Live spacecraft tracking, Deep sky exploration, Comprehensive astronomy education, Time travel from 1900 to 2100, Planet-centric viewing mode

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 1 Coffee | $2.99 | one-time |
| 3 Coffees | $8.99 | one-time |
| 5 Coffees | $14.99 | one-time |


## Frequently asked questions

### Is Solar System Clock free?

Solar System Clock is free to download, with no in-app purchases.

### Is Heliosphere free?

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

### Do Solar System Clock or Heliosphere have ads?

Neither Solar System Clock nor Heliosphere shows ads.

### Which is updated more often, Solar System Clock or Heliosphere?

Solar System Clock ships an update every 2 days, and Heliosphere every 3 days. Most recently, Solar System Clock was updated on August 15, 2026 and Heliosphere on August 28, 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.*