# Planet Gravity vs Newton's Cradle Plus

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.

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.

## The numbers

| Metric | Planet Gravity | Newton's Cradle Plus |
| --- | --- | --- |
| Price | **Free** | $2.99 |
| Rating | — | **[3.0 (6 ratings)](https://appshunter.io/ios/app/newtons-cradle-plus/id1619228586/reviews)** |
| Number of ratings | — | **6** |
| Positive reviews | **25.0% of reviews** | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 14 months** | Every 45 months |
| Monetization | **Free** | Paid |
| Size | 5 MB | 11 MB |
| Requires iOS | 17.6 | **12.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Niagara Mobile LLC](https://appshunter.io/developer/1039399999) | [Heng Jia Liang](https://appshunter.io/developer/1532000635) |

## What reviewers say

### Planet Gravity

[App page](https://appshunter.io/ios/app/planet-gravity/id995682820)

Explore the gravitational pull of different celestial bodies. Watch pendulums swing and collide under varying gravitational forces, offering a unique physics simulation experience.

**Highlights:** Select different planets for unique gravity, Observe pendulum collisions, Physics-based simulation, Educational planet facts, Interactive entertainment

**Features:** macOS Compatibility

**In-app purchases:** none


### Newton's Cradle Plus

[App page](https://appshunter.io/ios/app/newtons-cradle-plus/id1619228586)

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.

**Highlights:** Customizable background and ball colors, Adjustable energy loss and speed, Collision count display, Tick sound toggle, HDR display support, Portrait and landscape orientation

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Planet Gravity free?

Planet Gravity is free to download, with no in-app purchases.

### Is Newton's Cradle Plus free?

Newton's Cradle Plus costs $2.99, with no in-app purchases.

### Do Planet Gravity or Newton's Cradle Plus have ads?

Neither Planet Gravity nor Newton's Cradle Plus shows ads.

### Which is updated more often, Planet Gravity or Newton's Cradle Plus?

Planet Gravity ships an update every 14 months, and Newton's Cradle Plus every 45 months. Most recently, Planet Gravity was updated on June 7, 2026 and Newton's Cradle Plus on September 17, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*