# Hello Mars vs Cosmic Atlas

The clearest difference is in-app purchases: Hello Mars at none against Cosmic Atlas's 1. Hello Mars also leads on update cadence (every 3 days vs every 3 weeks) and iOS requirement (6.0 vs 14.0). On price, rating, review sentiment and ratings volume there is nothing between them.

Both are free to download. Cosmic Atlas sells 1 one-off in-app purchase. Hello Mars asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 3.6 for Hello Mars against 3.7 for Cosmic Atlas. Both are backed by a comparable volume of ratings — 22 and 65 respectively. Written reviews are what separate them: 57% of Hello Mars's written reviews are positive against 59% of Cosmic Atlas's.

Hello Mars ships an update every 3 days, Cosmic Atlas every 3 weeks. The most recent releases landed on November 2, 2026 and November 4, 2026 respectively.

## The numbers

| Metric | Hello Mars | Cosmic Atlas |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.6 (22 ratings)](https://appshunter.io/ios/app/hello-mars/id1097625079/reviews) | **[3.7 (65 ratings)](https://appshunter.io/ios/app/cosmic-atlas/id1305522465/reviews)** |
| Number of ratings | 22 | **65** |
| Positive reviews | 57.1% of reviews | **58.5% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 3 days** | Every 3 weeks |
| Monetization | **Free** | Free with in-app purchases |
| Size | 227 MB | 147 MB |
| Requires iOS | **6.0** | 14.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Lockheed Martin](https://appshunter.io/developer/400687539) | [Cosmic Atlas LLC](https://appshunter.io/developer/1503373138) |

## 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


### Cosmic Atlas

[App page](https://appshunter.io/ios/app/cosmic-atlas/id1305522465)

Explore a vast, scientifically rendered universe with lifelike exoplanets and detailed celestial bodies. Navigate through trillions of light years with multiple exploration modes, from first-person flight to telescopic identification. Discover and learn about thousands of planets beyond our solar system.

**Highlights:** Explore 5,000+ lifelike exoplanets, Navigate 180 trillion sq light years, Six interstellar travel modes, First-person planet view, Scientifically accurate renderings, Telescope identification mode, Detailed planet information panels

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Features | $0.99 | one-time |

**What reviewers like**

- ✨ Stunning visuals and graphics
- 🌌 Immersive exploration experience
- 📚 Great for learning about the universe
- 💡 Unique and original app
- 🚀 Fast and smooth performance (when working)

**What reviewers complain about**

- 🐛 Frequent crashes and errors
- 💸 Paywalls limit free version
- 🤔 Confusing in-app purchases
- 📱 Text size difficult to read
- 😵 Over-the-top and irritating graphics

**Reported bugs**

- App crashes upon opening
- Kicked out of the game
- Cannot connect to server
- Error that doesn't let user in
- Planets brighten up unexpectedly

**Requested features**

- Add more solar system objects
- Fix Haumea's shape
- Add more candidates, dwarf moons, hypothetical objects, spacecrafts, anomalies, random asteroids, meteoroids, and comets
- Add ability to go into planets and see a preview
- Add more galaxies to travel to


## Frequently asked questions

### Is Hello Mars free?

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

### Is Cosmic Atlas free?

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

### Which has better reviews, Hello Mars or Cosmic Atlas?

Cosmic Atlas is rated higher. Hello Mars averages 3.6 out of 5 from 22 ratings, while Cosmic Atlas averages 3.7 from 65 ratings.

### Do Hello Mars or Cosmic Atlas have ads?

Neither Hello Mars nor Cosmic Atlas shows ads.

### Which is updated more often, Hello Mars or Cosmic Atlas?

Hello Mars ships an update every 3 days, and Cosmic Atlas every 3 weeks. Most recently, Hello Mars was updated on November 2, 2026 and Cosmic Atlas on November 4, 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.*