# Stable Block vs Gravity OB1

The clearest difference is in-app purchases: Stable Block at none against Gravity OB1's 1. On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Gravity OB1 sells 1 one-off in-app purchase. Stable Block asks for nothing beyond the download.

## The numbers

| Metric | Stable Block | Gravity OB1 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | — | Every 5 days |
| Size | 172 MB | 25 MB |
| Requires iOS | **12.0** | 13.4 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [GOMBLE GAMES PTE. LTD.](https://appshunter.io/developer/1712246446) | [Q8blog](https://appshunter.io/developer/380669318) |

## What reviewers say

### Stable Block

[App page](https://appshunter.io/ios/app/stable-block/id6476475652)

**Features:** macOS Compatibility

**In-app purchases:** none


### Gravity OB1

[App page](https://appshunter.io/ios/app/gravity-ob1/id6788852525)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock Full Game | $3.99 | one-time |


## Frequently asked questions

### Is Stable Block free?

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

### Is Gravity OB1 free?

Gravity OB1 is free to download, with in-app purchases available.

### Do Stable Block or Gravity OB1 have ads?

Neither Stable Block nor Gravity OB1 shows ads.

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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.*