# Double Pendulum Simulation vs Learn Fortran Programming PRO

The clearest difference is price: Double Pendulum Simulation at Free against Learn Fortran Programming PRO's $1.99. Double Pendulum Simulation also leads on iOS requirement (7.0 vs 13.0). Learn Fortran Programming PRO's advantage is update cadence (every 10 months vs every 73 months). On ads, in-app purchases and device support there is nothing between them.

Double Pendulum Simulation is free to download; Learn Fortran Programming PRO costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Double Pendulum Simulation ships an update every 73 months, Learn Fortran Programming PRO every 10 months. The most recent releases landed on October 23, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | Double Pendulum Simulation | Learn Fortran Programming PRO |
| --- | --- | --- |
| Price | **Free** | $1.99 |
| 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 | No |
| Ads | No | No |
| Update frequency | Every 73 months | **Every 10 months** |
| Monetization | Free | — |
| Size | 0 MB | 61 MB |
| Requires iOS | **7.0** | 13.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [ManneTroll Solutions](https://appshunter.io/developer/313743954) | [Muhammad Mubeen](https://appshunter.io/developer/1553722821) |

## 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


### Learn Fortran Programming PRO

[App page](https://appshunter.io/ios/app/learn-fortran-programming-pro/id6753298583)

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

**In-app purchases:** none


## Frequently asked questions

### Is Double Pendulum Simulation free?

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

### Is Learn Fortran Programming PRO free?

Learn Fortran Programming PRO costs $1.99, with no in-app purchases.

### Do Double Pendulum Simulation or Learn Fortran Programming PRO have ads?

Neither Double Pendulum Simulation nor Learn Fortran Programming PRO shows ads.

### Which is updated more often, Double Pendulum Simulation or Learn Fortran Programming PRO?

Double Pendulum Simulation ships an update every 73 months, and Learn Fortran Programming PRO every 10 months. Most recently, Double Pendulum Simulation was updated on October 23, 2026 and Learn Fortran Programming PRO on October 8, 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.*