# Physarum vs Three

The clearest difference is update cadence: Three at every 5 days against Physarum's every 5 weeks. Three also leads on rating (5.0 vs 4.8) and iOS requirement (16.0 vs 26.0). Physarum's advantage is ratings volume (35 vs 1). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. Physarum sells 3 one-off in-app purchases and Three sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Three holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: Physarum has 35 ratings behind it against 1, so its average is the more settled of the two.

Physarum ships an update every 5 weeks, Three every 5 days. The most recent releases landed on November 8, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Physarum | Three |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.8 (35 ratings)](https://appshunter.io/ios/app/physarum-slime-mold/id6744574947/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/three-body-simulation/id6817179834/reviews)** |
| Number of ratings | **35** | 1 |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 5 weeks | **Every 5 days** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 32 MB | 10 MB |
| Requires iOS | 26.0 | **16.0** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [GEORGY OSTROBROD](https://appshunter.io/developer/1875865758) | [志强 曾](https://appshunter.io/developer/1800987336) |

## What reviewers say

### Physarum

[App page](https://appshunter.io/ios/app/physarum-slime-mold/id6744574947)

Explore the fascinating emergent behavior of slime molds through a visually rich simulation. Adjust agent parameters, influence growth with intuitive controls, and discover complex, mesmerizing patterns.

**Highlights:** Slime mold behavior simulation, Autonomous agent control, Adjustable agent parameters, Maze solving and network formation, Vibrant color modes, Interactive system manipulation

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Small developer tip | $1.99 | one-time |
| Medium developer tip | $3.99 | one-time |
| Big developer tip | $5.99 | one-time |


### 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 | $1.99 | one-time |


## Frequently asked questions

### Is Physarum free?

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

### Is Three free?

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

### Which has better reviews, Physarum or Three?

Three is rated higher. Physarum averages 4.8 out of 5 from 35 ratings, while Three averages 5.0 from 1 ratings.

### Do Physarum or Three have ads?

Neither Physarum nor Three shows ads.

### Which is updated more often, Physarum or Three?

Physarum ships an update every 5 weeks, and Three every 5 days. Most recently, Physarum was updated on November 8, 2026 and Three on October 31, 2026.

---

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