Planet Gravity vs Newton's Cradle Plus
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.....)
Newton's Cradle Plus
Experience a classic desk toy simulation with customizable physics and visual effects. Adjust energy loss, speed, and colors to create your own unique pendulum display. Enjoy a relaxing diversion that demonstrates fundamental laws of motion.
- Customizable background and ball colors
- Adjustable energy loss and speed
- Collision count display
- Tick sound toggle
- HDR display support
- Portrait and landscape orientation
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Newton's Cradle is a classic desk toy that makes a fun conversation piece and fits perfectly on a desktop or coffee table. Beside Demonstrates Newton's Laws of Motion, These swinging balls will help you occupied for hours at work. Features: • Able to set background colour. • Able to set random colour on ball collision. • Able to show or hide ball collision count from start to stop. • Able to play or mute tick sound on ball collision. • Able to set the energy loss rate of Newton's cradle, which will affect how long it'll take to finish. • Able to set the speed of Newton's cradle. • Able to set the HDR display for vivid color [for Super Retina Display or Super Retina XDR devices only]. • Simulate energy loss over time, from beginning movement to stop. • Support both portrait and landscape orientations. Newton's cradle, also called a Newton's rocker or a ball clicker are often used as a relaxing diversion on the desk. Newton's cradle is a device that demonstrates conservation of momentum and energy using a series of swinging spheres. When one sphere at the end is lifted and released, it strikes the stationary spheres, transmitting a force through the stationary spheres that pushes the last sphere upward. It was so-named in 1967 by English actor Simon Prebble, in honor of his countryman and revolutionary physicist Isaac Newton. Newton's Cradle is a device that not only demonstrates a pendulum, but also shows the Laws of Conservation of Momentum and Energy. When one ball on the end is lifted and released, the resulting force travels through the line and pushes the last ball upward. Because it uses Newton's Laws, it was named after Sir Isaac Newton, English physicist, mathematician and astronomer. Each ball acts like an individual pendulum. At rest all the balls are touching. When you lift one of the end balls and let it hit the resting balls, only the ball at the other end moves, and the initial ball stops at rest. Thanks for your support and do visit nitrio.com for more apps for your iOS devices.
Screenshots
Verdict
The clearest difference is price: Planet Gravity at Free against Newton's Cradle Plus's $2.99. Planet Gravity also leads on review sentiment (25% vs 0%) and update cadence (every 14 months vs every 45 months). Newton's Cradle Plus's advantage is iOS requirement (12.0 vs 17.6). On ads, in-app purchases 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
Planet Gravity is free to download; Newton's Cradle Plus costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Planet Gravity ships an update every 14 months, Newton's Cradle Plus every 45 months. The most recent releases landed on June 7, 2026 and September 17, 2026 respectively.
| Parameter | Planet Gravity | Newton's Cradle Plus |
|---|---|---|
| Price | Free — better | $2.99 |
| Rating | — | 3.0 (6 ratings) — better |
| Positive reviews | 25.0% of reviews — better | 0.0% of reviews |
| Number of ratings | — | 6 — better |
| Update frequency | Every 14 months — better | Every 45 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free — better | Paid |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 17.6 | 12.0 — better |
| Further details — not scored | ||
| Size | 5 MB | 11 MB |
| Age rating | 4+ | 4+ |
| Developer | Niagara Mobile LLC | Heng Jia Liang |
Customer experience
Planet Gravity
Newton's Cradle Plus
In-app purchases
Planet Gravity
No in-app purchases
Newton's Cradle Plus
No in-app purchases
Questions
Is Planet Gravity free?
Is Newton's Cradle Plus free?
Do Planet Gravity or Newton's Cradle Plus have ads?
Which is updated more often, Planet Gravity or Newton's Cradle Plus?
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