# GraviTrax vs Sky Flip

The clearest difference is ads: GraviTrax at none against Sky Flip's shown. GraviTrax also leads on iOS requirement (13.0 vs 15.6). Sky Flip's advantage is update cadence (every 2 months vs every 5 months). On price, in-app purchases and device support there is nothing between them.

Both are free to download. GraviTrax sells 1 one-off in-app purchase and Sky Flip sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

GraviTrax ships an update every 5 months, Sky Flip every 2 months. The most recent releases landed on October 22, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | GraviTrax | Sky Flip |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.4 (154 ratings)](https://appshunter.io/ios/app/gravitrax/id1236092166/reviews)** | — |
| Number of ratings | **154** | — |
| Positive reviews | 74.2% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 5 months | **Every 2 months** |
| Monetization | Free with in-app purchases | — |
| Size | 156 MB | 36 MB |
| Requires iOS | **13.0** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Ravensburger Verlag GmbH](https://appshunter.io/developer/1505283467) | [Martin Cavey](https://appshunter.io/developer/1865157568) |

## What reviewers say

### GraviTrax

[App page](https://appshunter.io/ios/app/gravitrax/id1236092166)

Design and experience custom ball tracks with a free editor. Explore physics principles like gravity and magnetism as you build and test your creations. Share your unique track designs with friends and discover new possibilities.

**Highlights:** Free track editor, Interactive ball rolling simulation, Multiple camera angles, Share track designs with friends, Physics-based gameplay (gravity, magnetism, kinetics), Extendable track system

**Features:** Family Sharing

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| GraviTrax PRO | $0.99 | one-time |

**What reviewers like**

- 👍 Great app for marble runs
- 🚀 Unlimited pieces to build with
- 🎨 Ability to view tracks from different angles
- 💡 Potential to test real-life tracks virtually

**What reviewers complain about**

- 🐛 Bugs with certain elements like the lift and spirals
- 🔒 In-app purchase required for full functionality
- 📦 Lack of integration with physical sets owned
- 🔧 Limited customization options for track building

**Reported bugs**

- Marble gets stuck on certain track elements
- Saving and loading tracks not working properly
- Placement of clear platforms and supports is limited
- Zipline functionality not working as expected

**Requested features**

- Add more track designs and layouts
- Implement a parts inventory system
- Allow sharing and downloading of user-created tracks
- Improve UI/UX for easier track building
- Add support for new Gravitrax expansions


### Sky Flip

[App page](https://appshunter.io/ios/app/sky-flip/id6767857284)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $2.99 | one-time |


## Frequently asked questions

### Is GraviTrax free?

GraviTrax is free to download, with in-app purchases available.

### Is Sky Flip free?

Sky Flip is free to download, with in-app purchases available.

### Do GraviTrax or Sky Flip have ads?

Sky Flip shows ads; GraviTrax does not.

### Which is updated more often, GraviTrax or Sky Flip?

GraviTrax ships an update every 5 months, and Sky Flip every 2 months. Most recently, GraviTrax was updated on October 22, 2026 and Sky Flip on October 1, 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.*