Gravity! vs Physarum
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Gravity!
Simulate the forces of gravity by flinging particles and observing their interactions. Create celestial bodies like planets and black holes, and customize their properties. Explore vast cosmic simulations with intuitive zoom and pan controls.
- Gravity simulation
- Particle interaction
- Create solar systems
- Add black holes
- Adjust particle properties
- Zoom and pan controls
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This app simulates the effects of gravity. You can fling particles at each other and watch them interact. Create solar systems and galaxies! Make a planet and fling asteroids into it! Add a black hole and watch everything get sucked in! You can adjust the size, mass, and color of the particles! Zoom in and out and look around with two fingers! App Preview Music: "Mesmerizing Galaxy " Kevin MacLeod (incompetech.com) Licensed under Creative Commons: By Attribution 4.0 License http://creativecommons.org/licenses/by/4.0/
Physarum
Explore the fascinating emergent behavior of slime molds through a visually rich simulation. Adjust agent parameters, influence growth with intuitive controls, and discover complex, mesmerizing patterns.
- Slime mold behavior simulation
- Autonomous agent control
- Adjustable agent parameters
- Maze solving and network formation
- Vibrant color modes
- Interactive system manipulation
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Explore artificial life through a living, flowing simulation inspired by Physarum polycephalum, the slime mold famous for forming networks, solving paths, and showing intelligence without a brain. Physarum turns simple local rules into complex motion. Thousands of agents sense trails, turn, move, and deposit new traces. As the field evolves, branching networks, waves, and organic textures emerge in real time. Use Physarum to: - Tune sensor distance, turn angle, movement, and trail strength - Paint into the field and guide the simulation by touch - Explore chaotic, branching, and self-organizing patterns - Save and restore interesting agents, fields, and rules - Create vivid generative visuals with color controls It is part science toy, part generative art studio, and part meditative visual instrument. Whether you study emergent systems, teach artificial life, or simply enjoy hypnotic motion, Physarum gives you a hands-on way to watch complexity grow from simple behavior.
Screenshots
Verdict
The clearest difference is rating: Physarum at 4.8 against Gravity!'s 3.9. Physarum also leads on review sentiment (100% vs 74%). Gravity!'s advantage is iOS requirement (15.6 vs 26.0). On price, ratings volume, update cadence and ads 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
Both are free to download. Gravity! sells 1 one-off in-app purchase and Physarum sells 3 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.
Physarum holds the better App Store score, 4.8 against 3.9. Both are backed by a comparable volume of ratings — 18 and 27 respectively. Written reviews point the same way: 74% of Gravity!'s written reviews are positive against 100% of Physarum's.
Gravity! ships an update every 2 months, Physarum every 5 weeks. The most recent releases landed on October 7, 2026 and October 15, 2026 respectively.
| Parameter | Gravity! | Physarum |
|---|---|---|
| Price | Free | Free |
| Rating | 3.9 (18 ratings) | 4.8 (27 ratings) — better |
| Positive reviews | 73.5% of reviews | 100.0% of reviews — better |
| Number of ratings | 18 | 27 — better |
| Update frequency | Every 2 months | Every 5 weeks — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 15.6 — better | 26.0 |
| Further details — not scored | ||
| Size | 17 MB | 32 MB |
| Age rating | 4+ | 4+ |
| Developer | Marc Davis | GEORGY OSTROBROD |
Customer experience
Gravity!
Physarum
In-app purchases
Gravity!
- Gravity! Extended Edition$0.99
Physarum
- Small developer tip2 variants$1.99
- Medium developer tip2 variants$3.99
- Big developer tip2 variants$5.99









