# Double Pendulum Simulation vs Shor's algorithm

The clearest difference is in-app purchases: Double Pendulum Simulation at none against Shor's algorithm's 3. Double Pendulum Simulation also leads on iOS requirement (7.0 vs 16.0). Shor's algorithm's advantage is update cadence (every 6 months vs every 73 months). On price, ads and device support there is nothing between them.

Both are free to download. Shor's algorithm sells 3 one-off in-app purchases. Double Pendulum Simulation asks for nothing beyond the download.

Double Pendulum Simulation ships an update every 73 months, Shor's algorithm every 6 months. The most recent releases landed on October 23, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | Double Pendulum Simulation | Shor's algorithm |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.0 (2 ratings)](https://appshunter.io/ios/app/double-pendulum-simulation/id370962405/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 37.5% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 73 months | **Every 6 months** |
| Monetization | Free | — |
| Size | 0 MB | 7 MB |
| Requires iOS | **7.0** | 16.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [ManneTroll Solutions](https://appshunter.io/developer/313743954) | [Sungjun Kim](https://appshunter.io/developer/1602461985) |

## What reviewers say

### Double Pendulum Simulation

[App page](https://appshunter.io/ios/app/double-pendulum-simulation/id370962405)

Explore the chaotic and dynamic behavior of a double pendulum. This app uses the Runge-Kutta method to solve differential equations, allowing you to influence the pendulum's motion by tilting your device.

**Highlights:** Double pendulum simulation, Runge-Kutta method solver, Chaotic dynamics exploration, Device tilt interaction, Educational physics tool

**Features:** macOS Compatibility

**In-app purchases:** none


### Shor's algorithm

[App page](https://appshunter.io/ios/app/shors-algorithm/id6472044082)

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| coffee | $0.99 | one-time |
| latte | $4.99 | one-time |
| whopper set | $9.99 | one-time |


## Frequently asked questions

### Is Double Pendulum Simulation free?

Double Pendulum Simulation is free to download, with no in-app purchases.

### Is Shor's algorithm free?

Shor's algorithm is free to download, with in-app purchases available.

### Do Double Pendulum Simulation or Shor's algorithm have ads?

Neither Double Pendulum Simulation nor Shor's algorithm shows ads.

### Which is updated more often, Double Pendulum Simulation or Shor's algorithm?

Double Pendulum Simulation ships an update every 73 months, and Shor's algorithm every 6 months. Most recently, Double Pendulum Simulation was updated on October 23, 2026 and Shor's algorithm on October 10, 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.*