# Gravity Trial vs HappyOneLine

The clearest difference is device support: Gravity Trial at 2 against HappyOneLine's —. On price, in-app purchases and iOS requirement there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

## The numbers

| Metric | Gravity Trial | HappyOneLine |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | Yes | — |
| Update frequency | Every 5 days | — |
| Size | 129 MB | 47 MB |
| Requires iOS | 13.0 | **12.0** |
| Devices | **iPhone, iPod** | — |
| Age rating | 4+ | 12+ |
| Developer | [Nhung Thi Lam Thi](https://appshunter.io/developer/1877108777) | [君宇 涂](https://appshunter.io/developer/1460785294) |

## What reviewers say

### Gravity Trial

[App page](https://appshunter.io/ios/app/gravity-trialplant-jump/id6760386779)

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

**In-app purchases:** none


### HappyOneLine

[App page](https://appshunter.io/ios/app/happyoneline/id6761748729)

**In-app purchases:** none


## Frequently asked questions

### Is Gravity Trial free?

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

### Is HappyOneLine free?

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

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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.*