Gravity Zen vs SyracuseX3+1
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.
SyracuseX3+1
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Two features in this app. First: The Syracuse problem or also called the Collatz conjecture is one of the most famous unsolved problems in mathematics. The conjecture asks whether repeating two simple arithmetic operations will eventually transform every positive integer into 1. Play with integers and check the result. See how small changes gives huge values but still eventually ends up down to 1. Find the number of calculations needed and the biggest value reached doing so. Second: Find the roots in a quadratic equation.
Screenshots
Verdict
The clearest difference is price: SyracuseX3+1 at Free against Gravity Zen's $0.99. SyracuseX3+1 also leads on in-app purchases (none vs 2). Gravity Zen's advantage is update cadence (every 9 days vs every 39 months). On ads, device support and iOS requirement 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
SyracuseX3+1 is free to download; Gravity Zen costs $0.99 up front. Gravity Zen sells 2 one-off in-app purchases. SyracuseX3+1 asks for nothing beyond the download.
Gravity Zen ships an update every 9 days, SyracuseX3+1 every 39 months. The most recent releases landed on October 30, 2026 and October 27, 2026 respectively.
| Parameter | Gravity Zen | SyracuseX3+1 |
|---|---|---|
| Price | $0.99 | Free — better |
| Rating | 4.8 (70 ratings) — better | — |
| Positive reviews | 93.8% of reviews | — |
| Number of ratings | 70 — better | — |
| Update frequency | Every 9 days — better | Every 39 months |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Paid | — |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 15.0 — better | 15.6 |
| Further details — not scored | ||
| Size | 13 MB | 0 MB |
| Age rating | 4+ | 4+ |
| Developer | Dominik Hauser | domesticusdevelop |
In-app purchases
Gravity Zen
- Small Tip$0.99
- Large tip$2.99
SyracuseX3+1
No in-app purchases
Questions
Is Gravity Zen free?
Is SyracuseX3+1 free?
Do Gravity Zen or SyracuseX3+1 have ads?
Which is updated more often, Gravity Zen or SyracuseX3+1?
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