# Gravity! vs Univerzoom 2D Size Comparison

The clearest difference is rating: Univerzoom 2D Size Comparison at 4.6 against Gravity!'s 3.9. Univerzoom 2D Size Comparison also leads on update cadence (weekly vs every 2 months) and review sentiment (100% vs 74%). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. Gravity! sells 1 one-off in-app purchase and Univerzoom 2D Size Comparison sells 3 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

Univerzoom 2D Size Comparison holds the better App Store score, 4.6 against 3.9. Both are backed by a comparable volume of ratings — 18 and 67 respectively. Written reviews point the same way: 74% of Gravity!'s written reviews are positive against 100% of Univerzoom 2D Size Comparison's.

Gravity! ships an update every 2 months, Univerzoom 2D Size Comparison weekly. The most recent releases landed on October 20, 2026 and October 17, 2026 respectively.

## The numbers

| Metric | Gravity! | Univerzoom 2D Size Comparison |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.9 (18 ratings)](https://appshunter.io/ios/app/gravity/id738871919/reviews) | **[4.6 (67 ratings)](https://appshunter.io/ios/app/univerzoom-2d-size-comparison/id1598332779/reviews)** |
| Number of ratings | 18 | **67** |
| Positive reviews | 73.5% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Weekly** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 17 MB | 254 MB |
| Requires iOS | 15.6 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Marc Davis](https://appshunter.io/developer/1010892850) | [Linda Schnetzinger](https://appshunter.io/developer/1479825448) |

## 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 |


### Univerzoom 2D Size Comparison

[App page](https://appshunter.io/ios/app/univerzoom-2d-size-comparison/id1598332779)

Explore the relative sizes of everyday objects with minimalist visual comparisons. Create and share custom comparisons of vehicles, animals, landmarks, and more to understand their true dimensions. Perfect for students, educators, and anyone curious about scale.

**Highlights:** Create custom size comparisons, Explore terrestrial object categories, Visualize dimensions in orthogonal perspective, Customize comparisons with an easy interface, Save and share visual references

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Upgrade to Complete Collection | $1.99 | one-time |
| Premium Unlock | $1.99 | one-time |
| Complete Collection | $3.99 | one-time |


## Frequently asked questions

### Is Gravity! free?

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

### Is Univerzoom 2D Size Comparison free?

Univerzoom 2D Size Comparison is free to download, with in-app purchases available.

### Which has better reviews, Gravity! or Univerzoom 2D Size Comparison?

Univerzoom 2D Size Comparison is rated higher. Gravity! averages 3.9 out of 5 from 18 ratings, while Univerzoom 2D Size Comparison averages 4.6 from 67 ratings.

### Do Gravity! or Univerzoom 2D Size Comparison have ads?

Neither Gravity! nor Univerzoom 2D Size Comparison shows ads.

### Which is updated more often, Gravity! or Univerzoom 2D Size Comparison?

Gravity! ships an update every 2 months, and Univerzoom 2D Size Comparison weekly. Most recently, Gravity! was updated on October 20, 2026 and Univerzoom 2D Size Comparison on October 17, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*