Gravity Zen vs Two Links Double Pendulum
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Gravity Zen
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.
- Gravity field simulation
- Add multiple objects
- Observe stable configurations
- Interactive physics
- Minimalist design
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Watch small circles move around a central gravity field. Add as many boxes as you like. Explore how they find a "stable" configuration by themselves.
Two Links Double Pendulum
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Two Links brings one of physics' most beautiful chaotic systems to life. Watch a double pendulum swing, twist, and spiral in real-time 3D — then place it on your floor in Augmented Reality and walk around it. Features • Real-time double pendulum physics (RK4 integration) • AR mode — anchor the pendulum on any flat surface • Orbit the 3D scene freely or let it run hands-free • Adjust link length, pivot position, density, and color • Particle trail from the second link tip • Night sky environment with the Moon and Earth • Pause, shuffle, and watch the chaos reset
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | Gravity Zen | Two Links Double Pendulum |
|---|---|---|
| Price | $0.99 | Free — better |
| Rating | 4.8 (68 ratings) — better | — |
| Positive reviews | 93.3% of reviews | — |
| Number of ratings | 68 — better | — |
| Update frequency | Every 9 days — better | Every 47 months |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Paid | — |
| Best chart rank | #193 — better | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.0 — better | 18.2 |
| Further details — not scored | ||
| Size | 13 MB | 281 MB |
| Age rating | 4+ | 4+ |
| Developer | Dominik Hauser | Eliott Radcliffe |
In-app purchases
Gravity Zen
- Small Tip$0.99
- Large tip$2.99
Two Links Double Pendulum
No in-app purchases
Questions
Is Gravity Zen free?
Is Two Links Double Pendulum free?
Do Gravity Zen or Two Links Double Pendulum have ads?
Which is updated more often, Gravity Zen or Two Links Double Pendulum?
Other comparisons
