# Just Plain Sudoku vs Mars 2501

The clearest difference is in-app purchases: Just Plain Sudoku at none against Mars 2501's 1. Just Plain Sudoku also leads on iOS requirement (12.0 vs 15.0). Mars 2501's advantage is ads (none vs shown). On price, update cadence and device support there is nothing between them.

Both are free to download. Mars 2501 sells 1 one-off in-app purchase. Just Plain Sudoku asks for nothing beyond the download.

Just Plain Sudoku ships an update every 2 months, Mars 2501 every 3 months. The most recent releases landed on October 19, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | Just Plain Sudoku | Mars 2501 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | **Every 2 months** | Every 3 months |
| Size | 42 MB | 111 MB |
| Requires iOS | **12.0** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 12+ |
| Developer | [Alptug Ince](https://appshunter.io/developer/1803226169) | [Janek Soomets](https://appshunter.io/developer/1315295062) |

## What reviewers say

### Just Plain Sudoku

[App page](https://appshunter.io/ios/app/just-plain-sudoku/id6743500580)

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

**In-app purchases:** none


### Mars 2501

[App page](https://appshunter.io/ios/app/mars-2501/id6746960028)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Upgrade Mars 2501 | $4.99 | one-time |


## Frequently asked questions

### Is Just Plain Sudoku free?

Just Plain Sudoku is free to download, with no in-app purchases.

### Is Mars 2501 free?

Mars 2501 is free to download, with in-app purchases available.

### Do Just Plain Sudoku or Mars 2501 have ads?

Just Plain Sudoku shows ads; Mars 2501 does not.

### Which is updated more often, Just Plain Sudoku or Mars 2501?

Just Plain Sudoku ships an update every 2 months, and Mars 2501 every 3 months. Most recently, Just Plain Sudoku was updated on October 19, 2026 and Mars 2501 on October 9, 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.*