# Ech's Fractal vs Two Links Double Pendulum

The clearest difference is update cadence: Ech's Fractal at every 18 months against Two Links Double Pendulum's every 47 months. Ech's Fractal also leads on iOS requirement (15.6 vs 18.2). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Ech's Fractal ships an update every 18 months, Two Links Double Pendulum every 47 months. The most recent releases landed on October 24, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Ech's Fractal | Two Links Double Pendulum |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.7 (6 ratings)](https://appshunter.io/ios/app/echs-fractal/id1315403987/reviews)** | — |
| Number of ratings | **6** | — |
| Positive reviews | 75.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 18 months** | Every 47 months |
| Monetization | Free | — |
| Size | 36 MB | 281 MB |
| Requires iOS | **15.6** | 18.2 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 9+ | 4+ |
| Developer | [Tuan Anh Nguyen](https://appshunter.io/developer/1176103364) | [Eliott Radcliffe](https://appshunter.io/developer/1477487767) |

## What reviewers say

### Ech's Fractal

[App page](https://appshunter.io/ios/app/echs-fractal/id1315403987)

Explore intricate fractal patterns with customizable depth and color palettes. This application allows users to render the Mandelbrot set with high detail.

**Highlights:** Customizable depth up to 5000, Customizable colors, Mandelbrot set rendering, High detail exploration

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

**In-app purchases:** none


### Two Links Double Pendulum

[App page](https://appshunter.io/ios/app/two-links-double-pendulum/id1625794656)

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

**In-app purchases:** none


## Frequently asked questions

### Is Ech's Fractal free?

Ech's Fractal is free to download, with no in-app purchases.

### Is Two Links Double Pendulum free?

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

### Do Ech's Fractal or Two Links Double Pendulum have ads?

Neither Ech's Fractal nor Two Links Double Pendulum shows ads.

### Which is updated more often, Ech's Fractal or Two Links Double Pendulum?

Ech's Fractal ships an update every 18 months, and Two Links Double Pendulum every 47 months. Most recently, Ech's Fractal was updated on October 24, 2026 and Two Links Double Pendulum on October 25, 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.*