# Gravity Zen vs Two Links Double Pendulum

The clearest difference is price: Two Links Double Pendulum at Free against Gravity Zen's $0.99. Two Links Double Pendulum also leads on in-app purchases (none vs 2). Gravity Zen's advantage is update cadence (every 9 days vs every 47 months) and chart position (#193 vs unranked). On ads and device support there is nothing between them.

Two Links Double Pendulum is free to download; Gravity Zen costs $0.99 up front. Gravity Zen sells 2 one-off in-app purchases. Two Links Double Pendulum asks for nothing beyond the download.

Gravity Zen ships an update every 9 days, Two Links Double Pendulum every 47 months. The most recent releases landed on October 13, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | Gravity Zen | Two Links Double Pendulum |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | **[4.8 (68 ratings)](https://appshunter.io/ios/app/gravity-zen/id1602081846/reviews)** | — |
| Number of ratings | **68** | — |
| Positive reviews | 93.3% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 9 days** | Every 47 months |
| Monetization | Paid | — |
| Best chart rank | **#193** | — |
| Size | 13 MB | 281 MB |
| Requires iOS | **15.0** | 18.2 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Dominik Hauser](https://appshunter.io/developer/325836858) | [Eliott Radcliffe](https://appshunter.io/developer/1477487767) |

## What reviewers say

### Gravity Zen

[App page](https://appshunter.io/ios/app/gravity-zen/id1602081846)

**Currently charting:** #193 Top Paid · Entertainment (US App Store)

Observe small circles interacting with a central gravity field. Add numerous boxes to explore how they naturally settle into a stable arrangement. It's a simple yet captivating simulation.

**Highlights:** Gravity field simulation, Add multiple objects, Observe stable configurations, Interactive physics, Minimalist design

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Small Tip | $0.99 | one-time |
| Large tip | $2.99 | one-time |


### Two Links Double Pendulum

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

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Gravity Zen free?

Gravity Zen costs $0.99, and also offers in-app purchases.

### Is Two Links Double Pendulum free?

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

### Do Gravity Zen or Two Links Double Pendulum have ads?

Neither Gravity Zen nor Two Links Double Pendulum shows ads.

### Which is updated more often, Gravity Zen or Two Links Double Pendulum?

Gravity Zen ships an update every 9 days, and Two Links Double Pendulum every 47 months. Most recently, Gravity Zen was updated on October 13, 2026 and Two Links Double Pendulum on October 6, 2026.

---

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