# Exoplanet vs Hello Mars

The clearest difference is rating: Exoplanet at 4.7 against Hello Mars's 3.6. Exoplanet also leads on review sentiment (91% vs 57%) and ratings volume (974 vs 22). Hello Mars's advantage is in-app purchases (none vs 7) and update cadence (every 3 days vs every 2 weeks). On price and ads there is nothing between them.

Both are free to download. Exoplanet sells 7 one-off in-app purchases. Hello Mars asks for nothing beyond the download.

Exoplanet holds the better App Store score, 4.7 against 3.6. That said, the two scores are not equally well evidenced: Exoplanet has 974 ratings behind it against 22, so its average is the more settled of the two. Written reviews point the same way: 91% of Exoplanet's written reviews are positive against 57% of Hello Mars's.

Exoplanet ships an update every 2 weeks, Hello Mars every 3 days. Both last shipped on October 24, 2026.

## The numbers

| Metric | Exoplanet | Hello Mars |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (974 ratings)](https://appshunter.io/ios/app/exoplanet/id327702034/reviews)** | [3.6 (22 ratings)](https://appshunter.io/ios/app/hello-mars/id1097625079/reviews) |
| Number of ratings | **974** | 22 |
| Positive reviews | **90.9% of reviews** | 57.1% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 weeks | **Every 3 days** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 105 MB | 227 MB |
| Requires iOS | 13.0 | **6.0** |
| Devices | **iPhone, iPad, iPod, Apple TV** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Hanno Rein](https://appshunter.io/developer/325840976) | [Lockheed Martin](https://appshunter.io/developer/400687539) |

## What reviewers say

### Exoplanet

[App page](https://appshunter.io/ios/app/exoplanet/id327702034)

Explore a vast, interactive database of discovered exoplanets and their host stars. Visualize their physical properties, locations in the night sky, and orbital paths. Discover the observable universe from Earth to the cosmic microwave background with stunning 3D models and augmented reality features.

**Highlights:** Interactive visualizations and animations, Daily updated exoplanet and host star properties, 3D Milky Way model with exoplanet locations, Augmented reality sky map, Exoplanet orbit and habitable zone visualizations, Data from multiple exoplanet catalogs

**Features:** macOS Compatibility

**In-app purchases (7)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Galaxy Clusters and CMB | $0.99 | one-time |
| Asteroids | $0.99 | one-time |
| Gaia Stars | $0.99 | one-time |
| S-Stars | $0.99 | one-time |
| Catalogues | $0.99 | one-time |
| Developer Appreciation Coffee | $1.99 | one-time |
| Kepler Add-on | $2.99 | one-time |

**What reviewers like**

- 🚀 Great app
- 👍 Insanely entertaining
- 👍 Amazing graphics and interactive diorama
- 👍 Detailed explanation of planets
- 👍 Awesome app for astronomy and physics lovers

**What reviewers complain about**

- 🐛 Some exoplanets not showing up in search
- 🐛 Inconsistent behavior when switching between databases
- 🔒 Paid upgrades required to access more features
- 🐛 Upgrade purchase issues with Galaxy Clusters and CMB add-on
- 🐛 Exoplanets represented as generic white balls

**Reported bugs**

- Upgrade purchase issues with Galaxy Clusters and CMB add-on
- Kepler objects of interest disappearing when switching databases

**Requested features**

- Add more detailed textures and visuals for exoplanets
- Ability to view multiple databases simultaneously
- Option to see planet surfaces and atmospheres
- Inclusion of dwarf planets in our solar system
- Ability to zoom in on and explore other galaxies


### 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


## Frequently asked questions

### Is Exoplanet free?

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

### Is Hello Mars free?

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

### Which has better reviews, Exoplanet or Hello Mars?

Exoplanet is rated higher. Exoplanet averages 4.7 out of 5 from 974 ratings, while Hello Mars averages 3.6 from 22 ratings.

### Do Exoplanet or Hello Mars have ads?

Neither Exoplanet nor Hello Mars shows ads.

### Which is updated more often, Exoplanet or Hello Mars?

Exoplanet ships an update every 2 weeks, and Hello Mars every 3 days. Most recently, Exoplanet was updated on October 24, 2026 and Hello Mars 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.*