# Planet Gravity > Physics simulation app demonstrating pendulum motion under different planetary gravity. (iPhone/iPad app by Niagara Mobile LLC.) - Source: https://appshunter.io/ios/app/planet-gravity/id995682820 (this page in markdown: same URL + `.md`) - Developer: [Niagara Mobile LLC](https://appshunter.io/developer/1039399999) - Category: Entertainment, Education - Price: Free (on sale, was $0.99) - Age rating: 4+ - Requires: iOS 17.6 · 5 MB - Languages: American English - Released: 2015-05-30 - Data updated: 2026-06-07 - Monetization: free - User reviews in markdown: https://appshunter.io/ios/app/planet-gravity/id995682820/reviews.md ## What is Planet Gravity? 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.....) ## Key features - Select different planets for unique gravity - Observe pendulum collisions - Physics-based simulation - Educational planet facts - Interactive entertainment ## Recent user reviews (4 of 4) All indexed reviews: https://appshunter.io/ios/app/planet-gravity/id995682820/reviews.md ### 1/5 — Won’t load *2024-04-12* Nothing happens. Tapping on app icon just takes me to my regular “front page”. No sign of the app. Disappointed. ### 5/5 — Wow *2018-12-10, version 3.1* I love this game!! I can watch the balls for hours. ### 1/5 — Doesn’t Work Right *2018-01-25, version 3.0* No settings other than you can “change gravity” and there re gaps between the “metal balls” so it doesn’t even work like you want it to. No sound control - totally overrides the sound no matter what. Just annoying that it doesn’t work as expected, and no “lite” version to find out BEFORE you buy. You would think it would at least be worth the 99cents, right and kind of work like a real newton’s cradle without gaps between everything. Maybe they had a defective model they started out with. Don’t get me wrong - I think they probably put a fair amount of effort into this product, and it is colorful, but overall very much lacking. Almost gave it two stars and decided it wasn’t really worth two stars. ### 1/5 — Inaccurate *2015-10-14, version 1.0* Inaccurate gravity figures and unrealistic movement. ## Frequently asked questions about Planet Gravity ### What is Planet Gravity? Planet Gravity is an entertainment app that simulates the motion of pendulums under the gravitational pull of different planets and celestial bodies. It also provides scrolling facts about the selected planet. ### Does Planet Gravity have ads? No, Planet Gravity does not contain advertisements. It offers an uninterrupted user experience. ### What devices can I use Planet Gravity on? Planet Gravity is available for iPhone and iPad devices, offering a consistent experience across Apple's mobile platforms. ### How often is Planet Gravity updated? The app was last updated on December 21, 2025, indicating ongoing support and potential for future enhancements. The latest version is 7.0. ### What is the age rating for Planet Gravity? Planet Gravity has an age rating of 4+, making it suitable for young children and families to explore physics concepts. ### Can I play Planet Gravity offline? The provided information does not specify offline play capabilities. However, as a simulation and fact-based app, it is likely designed to function without an internet connection. ### What makes Planet Gravity unique compared to other physics apps? Planet Gravity uniquely combines a Newton's cradle-style pendulum simulation with educational facts about various planets, allowing users to experiment with different gravitational forces. ## Version history (last 5 releases) ### 7.0 — 2025-12-21 Updated for iOS 26 and latest iPhone models ### 6.0 — 2024-12-19 Updated for new device screen sizes ### 5.0 — 2023-11-03 General Bug fixes ### 4.0 — 2020-06-14 Major Upgrade with support for all iPhones 5 and above and iPads 4th Gen and above. More realistic physics on the pendulum balls. ### 3.1 — 2018-10-24 Improved motion of the pendulum balls. Updated help. ## Apps similar to Planet Gravity | App | Rating | Price | Category | | --- | --- | --- | --- | | [AR Solar System PRO](https://appshunter.io/ios/app/ar-solar-system-pro/id1327934893) | — | $0.99 | Entertainment | | [Sandbox Planet](https://appshunter.io/ios/app/sandbox-planet/id1527841661) | 4.5 (287) | $14.99 | Entertainment | | [Galaxy Gallery: AR](https://appshunter.io/ios/app/galaxy-gallery-ar/id1662263674) | 5.0 (3) | Free | Entertainment | | [Flataverse: Explore Flat Earth](https://appshunter.io/ios/app/flataverse-explore-flat-earth/id6720764565) | 4.7 (589) | Free | Entertainment | | [SolarX AR](https://appshunter.io/ios/app/solarx-ar/id6447647945) | — | Free | Entertainment | | [Newton's Cradle Plus](https://appshunter.io/ios/app/newtons-cradle-plus/id1619228586) | 3.0 (6) | $2.99 | Entertainment | ## More apps by Niagara Mobile LLC - [Compressible Gas Flow Calc](https://appshunter.io/ios/app/compressible-gas-flow-calc/id900600984) - [General Trivia](https://appshunter.io/ios/app/general-trivia/id1031649015) - [General Trivia 2](https://appshunter.io/ios/app/general-trivia-2/id1039400001) - [Picture Call](https://appshunter.io/ios/app/picture-call/id1515161613) All apps by Niagara Mobile LLC: https://appshunter.io/developer/1039399999 ## Related topics [newtons cradle](https://appshunter.io/ios/topics/newtons-cradle) --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-07.*