# 3 vs iVocabulary Pro

The clearest difference is price: 3 at Free against iVocabulary Pro's $49.99. 3 also leads on iOS requirement (15.0 vs 17.0). On update cadence, ads, in-app purchases and device support there is nothing between them.

3 is free to download; iVocabulary Pro costs $49.99 up front. Neither carries in-app purchases, so what you see is what you pay.

3 ships an update monthly, iVocabulary Pro every 3 weeks. The most recent releases landed on October 22, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | 3 | iVocabulary Pro |
| --- | --- | --- |
| Price | **Free** | $49.99 |
| Rating | **[5.0 (3 ratings)](https://appshunter.io/ios/app/3-body/id6642661687/reviews)** | — |
| Number of ratings | **3** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Monthly | **Every 3 weeks** |
| Monetization | Free | — |
| Size | 9 MB | 64 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Mac |
| Age rating | 4+ | 4+ |
| Developer | [Cubic Insights LLC](https://appshunter.io/developer/1763432190) | [Christian Beer](https://appshunter.io/developer/294531018) |

## What reviewers say

### 3

[App page](https://appshunter.io/ios/app/3-body/id6642661687)

Explore the wonders of gravity with this 2D N-body simulator. Experiment with celestial mechanics, create mesmerizing patterns, and customize your simulations. It's a fun and educational playground for anyone curious about physics.

**Highlights:** Simulate gravity interactions, Explore preset configurations, Customize body size, color, and trails, Educational and fun physics experiments, Create mesmerizing visual patterns

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

**In-app purchases:** none


### iVocabulary Pro

[App page](https://appshunter.io/ios/app/ivocabulary-pro/id6744297039)

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is 3 free?

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

### Is iVocabulary Pro free?

iVocabulary Pro costs $49.99, with no in-app purchases.

### Do 3 or iVocabulary Pro have ads?

Neither 3 nor iVocabulary Pro shows ads.

### Which is updated more often, 3 or iVocabulary Pro?

3 ships an update monthly, and iVocabulary Pro every 3 weeks. Most recently, 3 was updated on October 22, 2026 and iVocabulary Pro on October 30, 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.*