# Circle Tracker vs 3

The clearest difference is iOS requirement: Circle Tracker at 8.0 against 3's 15.0. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Circle Tracker ships an update every 6 weeks, 3 monthly. The most recent releases landed on September 23, 2026 and September 18, 2026 respectively.

## The numbers

| Metric | Circle Tracker | 3 |
| --- | --- | --- |
| Price | Free | Free |
| 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 | Every 6 weeks | **Monthly** |
| Monetization | — | Free |
| Size | 48 MB | 9 MB |
| Requires iOS | **8.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Beijing IQI Technology Co.,Ltd.](https://appshunter.io/developer/1166057913) | [Cubic Insights LLC](https://appshunter.io/developer/1763432190) |

## What reviewers say

### Circle Tracker

[App page](https://appshunter.io/ios/app/circle-tracker/id1460564982)

**Features:** macOS Compatibility

**In-app purchases:** none


### 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


## Frequently asked questions

### Is Circle Tracker free?

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

### Is 3 free?

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

### Do Circle Tracker or 3 have ads?

Neither Circle Tracker nor 3 shows ads.

### Which is updated more often, Circle Tracker or 3?

Circle Tracker ships an update every 6 weeks, and 3 monthly. Most recently, Circle Tracker was updated on September 23, 2026 and 3 on September 18, 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.*