# AP Score Estimator vs Three

The clearest difference is in-app purchases: AP Score Estimator at none against Three's 1. On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Three sells 1 one-off in-app purchase. AP Score Estimator asks for nothing beyond the download.

## The numbers

| Metric | AP Score Estimator | Three |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/three-body-simulation/id6817179834/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | — | Every 4 days |
| Monetization | — | Free with in-app purchases |
| Size | 42 MB | 6 MB |
| Requires iOS | **15.1** | 16.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Wow Choice](https://appshunter.io/developer/1896488074) | [志强 曾](https://appshunter.io/developer/1800987336) |

## What reviewers say

### AP Score Estimator

[App page](https://appshunter.io/ios/app/ap-score-estimator/id6799535693)

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

**In-app purchases:** none


### Three

[App page](https://appshunter.io/ios/app/three-body-simulation/id6817179834)

Explore the fascinating beauty of gravity and celestial motion. Interact with three bodies, discover countless orbital paths, and experiment with your own gravity scenarios. Turn curiosity into understanding with this educational simulation.

**Highlights:** Explore 16 classic periodic solutions, Discover 10,059 3D periodic orbits, Experiment with custom gravity scenarios, Learn about the three-body problem, Offline exploration of orbits, Interactive celestial motion simulation

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Lifetime Unlock | $0.99 | one-time |


## Frequently asked questions

### Is AP Score Estimator free?

AP Score Estimator is free to download, with no in-app purchases.

### Is Three free?

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

### Do AP Score Estimator or Three have ads?

Neither AP Score Estimator nor Three shows ads.

---

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