# Double Pendulum Simulation vs Pendulum Lab

The clearest difference is price: Double Pendulum Simulation at Free against Pendulum Lab's $0.99. Double Pendulum Simulation also leads on in-app purchases (none vs 1) and iOS requirement (7.0 vs 15.0). Pendulum Lab's advantage is update cadence (every 5 weeks vs every 73 months). On ads and device support there is nothing between them.

Double Pendulum Simulation is free to download; Pendulum Lab costs $0.99 up front. Pendulum Lab sells 1 one-off in-app purchase. Double Pendulum Simulation asks for nothing beyond the download.

Double Pendulum Simulation ships an update every 73 months, Pendulum Lab every 5 weeks. The most recent releases landed on September 24, 2026 and September 17, 2026 respectively.

## The numbers

| Metric | Double Pendulum Simulation | Pendulum Lab |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| 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 5 weeks** |
| Monetization | Free | — |
| Size | 0 MB | 4 MB |
| Requires iOS | **7.0** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [ManneTroll Solutions](https://appshunter.io/developer/313743954) | [hyeonsu jeong](https://appshunter.io/developer/1628268684) |

## 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


### Pendulum Lab

[App page](https://appshunter.io/ios/app/pendulum-lab/id6661026555)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Triple Pendulum Unlock | $0.99 | one-time |


## Frequently asked questions

### Is Double Pendulum Simulation free?

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

### Is Pendulum Lab free?

Pendulum Lab costs $0.99, and also offers in-app purchases.

### Do Double Pendulum Simulation or Pendulum Lab have ads?

Neither Double Pendulum Simulation nor Pendulum Lab shows ads.

### Which is updated more often, Double Pendulum Simulation or Pendulum Lab?

Double Pendulum Simulation ships an update every 73 months, and Pendulum Lab every 5 weeks. Most recently, Double Pendulum Simulation was updated on September 24, 2026 and Pendulum Lab on September 17, 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.*