# Gravity! vs Hubble

The clearest difference is review sentiment: Gravity! at 74% against Hubble's 0%. Gravity! also leads on rating (4.0 vs 3.0) and ads (none vs shown). Hubble's advantage is iOS requirement (13.0 vs 15.6). On price, in-app purchases, monetization model and device support there is nothing between them.

Both are free to download. Gravity! sells 1 one-off in-app purchase and Hubble sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Gravity! holds the better App Store score, 4.0 against 3.0. That said, the two scores are not equally well evidenced: Gravity! has 19 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 74% of Gravity!'s written reviews are positive against 0% of Hubble's.

Gravity! ships an update every 2 months, Hubble every 23 months. The most recent releases landed on November 13, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | Gravity! | Hubble |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.0 (19 ratings)](https://appshunter.io/ios/app/gravity/id738871919/reviews)** | [3.0 (2 ratings)](https://appshunter.io/ios/app/hubble-deep-space-2/id1615227352/reviews) |
| Number of ratings | **19** | 2 |
| Positive reviews | **73.5% of reviews** | 0.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 2 months** | Every 23 months |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 17 MB | 1.7 GB |
| Requires iOS | 15.6 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 9+ |
| Developer | [Marc Davis](https://appshunter.io/developer/1010892850) | [Alparslan Topbas](https://appshunter.io/developer/1130875171) |

## What reviewers say

### Gravity!

[App page](https://appshunter.io/ios/app/gravity/id738871919)

Simulate the forces of gravity by flinging particles and observing their interactions. Create celestial bodies like planets and black holes, and customize their properties. Explore vast cosmic simulations with intuitive zoom and pan controls.

**Highlights:** Gravity simulation, Particle interaction, Create solar systems, Add black holes, Adjust particle properties, Zoom and pan controls

**Features:** macOS Compatibility, Family Sharing, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Gravity! Extended Edition | $0.99 | one-time |


### Hubble

[App page](https://appshunter.io/ios/app/hubble-deep-space-2/id1615227352)

Explore the universe with stunning images and videos from the Hubble Space Telescope. Discover detailed information about deep space objects and view 3D models. Enjoy an immersive educational experience.

**Highlights:** Browse 550+ high-resolution space photos, Detailed information on space objects, Full-screen slideshow mode, Zoomable image gallery, 220+ educational videos, Interactive 3D models

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Hubble: Deep Space 2 - Ad-Free | $0.99 | one-time |


## Frequently asked questions

### Is Gravity! free?

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

### Is Hubble free?

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

### Which has better reviews, Gravity! or Hubble?

Gravity! is rated higher. Gravity! averages 4.0 out of 5 from 19 ratings, while Hubble averages 3.0 from 2 ratings.

### Do Gravity! or Hubble have ads?

Hubble shows ads; Gravity! does not.

### Which is updated more often, Gravity! or Hubble?

Gravity! ships an update every 2 months, and Hubble every 23 months. Most recently, Gravity! was updated on November 13, 2026 and Hubble on November 3, 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.*