# Terje Tornado vs Gravity Zen

The clearest difference is price: Terje Tornado at Free against Gravity Zen's $0.99. Terje Tornado also leads on in-app purchases (none vs 2) and rating (5.0 vs 4.8). Gravity Zen's advantage is ratings volume (70 vs 3). On update cadence, ads and device support there is nothing between them.

Terje Tornado is free to download; Gravity Zen costs $0.99 up front. Gravity Zen sells 2 one-off in-app purchases. Terje Tornado asks for nothing beyond the download.

Terje Tornado holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: Gravity Zen has 70 ratings behind it against 3, so its average is the more settled of the two.

Terje Tornado ships an update every 5 days, Gravity Zen every 9 days. The most recent releases landed on October 24, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Terje Tornado | Gravity Zen |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Rating | **[5.0 (3 ratings)](https://appshunter.io/ios/app/terje-tornado/id1592149938/reviews)** | [4.8 (70 ratings)](https://appshunter.io/ios/app/gravity-zen/id1602081846/reviews) |
| Number of ratings | 3 | **70** |
| Positive reviews | — | 93.8% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 5 days** | Every 9 days |
| Monetization | **Free** | Paid |
| Size | 328 MB | 13 MB |
| Requires iOS | **11.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [ECO Systems](https://appshunter.io/developer/1625468719) | [Dominik Hauser](https://appshunter.io/developer/325836858) |

## What reviewers say

### Terje Tornado

[App page](https://appshunter.io/ios/app/terje-tornado/id1592149938)

An interactive digital mapping platform for outdoor enthusiasts, offering an "on-mountain" gaming experience. It leverages GPS technology to enhance active lifestyles and outdoor play.

**Highlights:** Digital mapping platform, On-mountain gaming experience, Designed for outdoor enthusiasts, Active lifestyle focus, GPS-powered

**Features:** macOS Compatibility

**In-app purchases:** none


### Gravity Zen

[App page](https://appshunter.io/ios/app/gravity-zen/id1602081846)

Observe small circles interacting with a central gravity field. Add numerous boxes to explore how they naturally settle into a stable arrangement. It's a simple yet captivating simulation.

**Highlights:** Gravity field simulation, Add multiple objects, Observe stable configurations, Interactive physics, Minimalist design

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Small Tip | $0.99 | one-time |
| Large tip | $2.99 | one-time |


## Frequently asked questions

### Is Terje Tornado free?

Terje Tornado is free to download, with no in-app purchases.

### Is Gravity Zen free?

Gravity Zen costs $0.99, and also offers in-app purchases.

### Which has better reviews, Terje Tornado or Gravity Zen?

Terje Tornado is rated higher. Terje Tornado averages 5.0 out of 5 from 3 ratings, while Gravity Zen averages 4.8 from 70 ratings.

### Do Terje Tornado or Gravity Zen have ads?

Neither Terje Tornado nor Gravity Zen shows ads.

### Which is updated more often, Terje Tornado or Gravity Zen?

Terje Tornado ships an update every 5 days, and Gravity Zen every 9 days. Most recently, Terje Tornado was updated on October 24, 2026 and Gravity Zen on October 30, 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.*