Planet Gravity vs The Public Variable
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Planet Gravity
Explore the gravitational pull of different celestial bodies. Watch pendulums swing and collide under varying gravitational forces, offering a unique physics simulation experience.
- Select different planets for unique gravity
- Observe pendulum collisions
- Physics-based simulation
- Educational planet facts
- Interactive entertainment
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Planet Gravity isn't just about gravity anymore. Select a planet to get a scrolling fact about that planet on the display. This app is a twist on the Newton’s cradle balance balls. The pendulum balls collide just like the real set and you can select other planets to use that planet’s gravity. How does the pendulum swing with different gravity? Even the Sun has gravity - see what it does to the motion of the pendulums (well they'd probably melt but you get the idea.....)
The Public Variable
Experience a unique augmented reality theatre piece exploring perspective and communication. This evolving digital space will eventually host the full production, offering an immersive artistic experience accessible from anywhere.
- Augmented reality theatre
- Perspective exploration
- Immersive digital space
- Evolving content
- Accessible anywhere
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I'm building a feature length AR experience, scene by scene. A piece of theatre about perspective, and how we stopped hearing each other. And how we might fix it. And, through this platform, a piece of theatre you can experience wherever you are. This space will be updating and expanding until it eventually contains the entire piece, and more. Your support couldn't mean more than it would right now. publicvariabletheatre.org
Screenshots
Verdict
The clearest difference is update cadence: The Public Variable at every 2 weeks against Planet Gravity's every 14 months. The Public Variable also leads on iOS requirement (15.0 vs 17.6). On price, ads, in-app purchases and monetization model 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. Neither carries in-app purchases, so what you see is what you pay.
Planet Gravity ships an update every 14 months, The Public Variable every 2 weeks. The most recent releases landed on October 6, 2026 and October 12, 2026 respectively.
| Parameter | Planet Gravity | The Public Variable |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (2 ratings) — better |
| Positive reviews | 25.0% of reviews | — |
| Number of ratings | — | 2 — better |
| Update frequency | Every 14 months | Every 2 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 17.6 | 15.0 — better |
| Further details — not scored | ||
| Size | 5 MB | 1.4 GB |
| Age rating | 4+ | 17+ |
| Developer | Niagara Mobile LLC | John Sullivan |
Customer experience
Planet Gravity
The Public Variable
In-app purchases
Planet Gravity
No in-app purchases
The Public Variable
No in-app purchases
Questions
Is Planet Gravity free?
Is The Public Variable free?
Do Planet Gravity or The Public Variable have ads?
Which is updated more often, Planet Gravity or The Public Variable?
Other comparisons
