# Merge Planets vs Gravity OB1

The clearest difference is in-app purchases: Merge Planets at none against Gravity OB1's 1. Gravity OB1's advantage is iOS requirement (13.4 vs 15.6). On price, update cadence, ads and device support there is nothing between them.

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

Merge Planets ships an update every 6 days, Gravity OB1 every 5 days. The most recent releases landed on October 7, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | Merge Planets | Gravity OB1 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (6 ratings)](https://appshunter.io/ios/app/merge-planets-space-puzzle/id6748922887/reviews)** | — |
| Number of ratings | **6** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 6 days | **Every 5 days** |
| Monetization | Free | — |
| Size | 120 MB | 25 MB |
| Requires iOS | 15.6 | **13.4** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Aykut YILDIRIM](https://appshunter.io/developer/1682027491) | [Q8blog](https://appshunter.io/developer/380669318) |

## What reviewers say

### Merge Planets

[App page](https://appshunter.io/ios/app/merge-planets-space-puzzle/id6748922887)

Merge identical planets by dragging and dropping them to create the next planet in sequence. Progress through the solar system from Pluto to the Sun, aiming for the highest score in this relaxing puzzle game.

**Highlights:** Drag and merge identical planets, Progressive solar system journey, Clear objective to reach the Sun, Relaxing visuals and ambient sound, Automatic progress saving, Offline play

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

**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 Merge Planets free?

Merge Planets 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 Merge Planets or Gravity OB1 have ads?

Neither Merge Planets nor Gravity OB1 shows ads.

### Which is updated more often, Merge Planets or Gravity OB1?

Merge Planets ships an update every 6 days, and Gravity OB1 every 5 days. Most recently, Merge Planets was updated on October 7, 2026 and Gravity OB1 on October 14, 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.*