# Hello Mars vs Solar System Planets

The clearest difference is review sentiment: Hello Mars at 57% against Solar System Planets's 0%. Hello Mars also leads on in-app purchases (none vs 3) and rating (3.6 vs 3.1). Solar System Planets's advantage is device support (4 vs 2). On price, ratings volume and ads there is nothing between them.

Both are free to download. Solar System Planets sells 3 in-app purchases, starting at $9.99 per month. Hello Mars asks for nothing beyond the download.

Hello Mars holds the better App Store score, 3.6 against 3.1. Both are backed by a comparable volume of ratings — 22 and 9 respectively. Written reviews point the same way: 57% of Hello Mars's written reviews are positive against 0% of Solar System Planets's.

Hello Mars ships an update every 3 days, Solar System Planets every 4 months. The most recent releases landed on September 7, 2026 and July 8, 2026 respectively.

## The numbers

| Metric | Hello Mars | Solar System Planets |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.6 (22 ratings)](https://appshunter.io/ios/app/hello-mars/id1097625079/reviews)** | [3.1 (9 ratings)](https://appshunter.io/ios/app/solar-system-planets-3d-space/id6463002338/reviews) |
| Number of ratings | **22** | 9 |
| Positive reviews | **57.1% of reviews** | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 3 days** | Every 4 months |
| Monetization | **Free** | Free with in-app purchases |
| Size | 227 MB | 147 MB |
| Requires iOS | **6.0** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Lockheed Martin](https://appshunter.io/developer/400687539) | [Evgeniya Senchurova](https://appshunter.io/developer/1676838995) |

## What reviewers say

### Hello Mars

[App page](https://appshunter.io/ios/app/hello-mars/id1097625079)

Explore the stars and journey to Mars with real-time weather data directly from the Curiosity Rover. Track planetary positions and share your cosmic adventures.

**Highlights:** Real-time weather from Curiosity Rover, Accurate planetary tracking, Share experiences on social media, Explore Mars on your phone

**Features:** macOS Compatibility

**In-app purchases:** none


### Solar System Planets

[App page](https://appshunter.io/ios/app/solar-system-planets-3d-space/id6463002338)

Explore our solar system with interactive 3D models and detailed information about each planet. Discover celestial bodies and uncover their secrets through a user-friendly interface, perfect for students and space enthusiasts alike.

**Highlights:** Interactive 3D solar system model, High-resolution planet imagery, Detailed planet information, User-friendly interface, Educational content, Celestial body exploration

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| One Month Premium Access | $9.99 | per month |
| Three Months Premium Access | $19.99 | per 3 months |
| One Year Premium Access | $24.99 | per year |


## Frequently asked questions

### Is Hello Mars free?

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

### Is Solar System Planets free?

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

### Which has better reviews, Hello Mars or Solar System Planets?

Hello Mars is rated higher. Hello Mars averages 3.6 out of 5 from 22 ratings, while Solar System Planets averages 3.1 from 9 ratings.

### Do Hello Mars or Solar System Planets have ads?

Neither Hello Mars nor Solar System Planets shows ads.

### Which is updated more often, Hello Mars or Solar System Planets?

Hello Mars ships an update every 3 days, and Solar System Planets every 4 months. Most recently, Hello Mars was updated on September 7, 2026 and Solar System Planets on July 8, 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.*