# Project Planet Space vs Heliosphere

The clearest difference is rating: Project Planet Space at 5.0 against Heliosphere's 3.0. Project Planet Space also leads on in-app purchases (none vs 3) and iOS requirement (15.0 vs 18.0). Heliosphere's advantage is update cadence (every 3 days vs every 25 months). On price, ratings volume, ads and monetization model there is nothing between them.

Both are free to download. Heliosphere sells 3 one-off in-app purchases. Project Planet Space asks for nothing beyond the download.

Project Planet Space holds the better App Store score, 5.0 against 3.0. Both are backed by a comparable volume of ratings — 1 and 2 respectively.

Project Planet Space ships an update every 25 months, Heliosphere every 3 days. The most recent releases landed on October 27, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Project Planet Space | Heliosphere |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/project-planet-space/id6499347273/reviews)** | [3.0 (2 ratings)](https://appshunter.io/ios/app/heliosphere-solar-system/id6757491622/reviews) |
| Number of ratings | 1 | **2** |
| Positive reviews | — | 50.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 25 months | **Every 3 days** |
| Monetization | Free | Free |
| Size | 2 MB | 37 MB |
| Requires iOS | **15.0** | 18.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Vision Pro |
| Age rating | 4+ | 4+ |
| Developer | [Miroslav Hanzelka](https://appshunter.io/developer/1653768748) | [CHUNGKIL KIM](https://appshunter.io/developer/960187999) |

## What reviewers say

### Project Planet Space

[App page](https://appshunter.io/ios/app/project-planet-space/id6499347273)

Explore our solar system with an interactive map. Discover planetary gravity, temperatures, and atmospheric data. Calculate your weight on other worlds and learn fascinating space facts.

**Highlights:** Interactive solar system map, Personalized weight and age calculations, Detailed planetary data widgets, Multi-language support, Metric/Imperial unit switching, Cosmic museum aesthetic, Real astronomical data integration

**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 Project Planet Space free?

Project Planet Space is free to download, with no in-app purchases.

### Is Heliosphere free?

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

### Which has better reviews, Project Planet Space or Heliosphere?

Project Planet Space is rated higher. Project Planet Space averages 5.0 out of 5 from 1 ratings, while Heliosphere averages 3.0 from 2 ratings.

### Do Project Planet Space or Heliosphere have ads?

Neither Project Planet Space nor Heliosphere shows ads.

### Which is updated more often, Project Planet Space or Heliosphere?

Project Planet Space ships an update every 25 months, and Heliosphere every 3 days. Most recently, Project Planet Space was updated on October 27, 2026 and Heliosphere on October 24, 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.*