# SudoEarth vs Ninekeep

The clearest difference is in-app purchases: Ninekeep at none against SudoEarth's 2. SudoEarth's advantage is ads (none vs shown) and update cadence (weekly vs monthly). On price, device support and iOS requirement there is nothing between them.

Both are free to download. SudoEarth sells 2 in-app purchases, starting at $2.99 per month. Ninekeep asks for nothing beyond the download.

SudoEarth ships an update weekly, Ninekeep monthly. The most recent releases landed on October 25, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | SudoEarth | Ninekeep |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (2 ratings)](https://appshunter.io/ios/app/ninekeep-sudoku/id6787771732/reviews)** |
| Number of ratings | — | **2** |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | **Weekly** | Monthly |
| Monetization | — | Free with in-app purchases |
| Size | 30 MB | 13 MB |
| Requires iOS | 17.0 | 17.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [月 胡](https://appshunter.io/developer/1601604273) | [Velcairn Studios LLC](https://appshunter.io/developer/6787771734) |

## What reviewers say

### SudoEarth

[App page](https://appshunter.io/ios/app/sudoearth/id6765543717)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| SudoEarth Premium · Monthly | $2.99 | per month |
| SudoEarth Premium · Yearly | $19.99 | per year |


### Ninekeep

[App page](https://appshunter.io/ios/app/ninekeep-sudoku/id6787771732)

This Sudoku game focuses on teaching you advanced solving techniques. It offers classic and Sums modes with customizable difficulty. Earn in-game currency to unlock new themes without any forced ads.

**Highlights:** Teaches Sudoku solving techniques, Classic and Sums (Killer Sudoku) modes, Customizable difficulty levels, Unlimited puzzle generation, Daily Ledger for tracking progress, Unlockable themes via in-game currency

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

**In-app purchases:** none


## Frequently asked questions

### Is SudoEarth free?

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

### Is Ninekeep free?

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

### Do SudoEarth or Ninekeep have ads?

Ninekeep shows ads; SudoEarth does not.

### Which is updated more often, SudoEarth or Ninekeep?

SudoEarth ships an update weekly, and Ninekeep monthly. Most recently, SudoEarth was updated on October 25, 2026 and Ninekeep on October 31, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*