# Ninekeep vs CROSSUP

The clearest difference is in-app purchases: Ninekeep at none against CROSSUP's 10. CROSSUP's advantage is ads (none vs shown) and iOS requirement (15.0 vs 17.0). On price, update cadence and device support there is nothing between them.

Both are free to download. CROSSUP sells 10 one-off in-app purchases. Ninekeep asks for nothing beyond the download.

Ninekeep ships an update monthly, CROSSUP every 6 weeks. Both last shipped on October 31, 2026.

## The numbers

| Metric | Ninekeep | CROSSUP |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/ninekeep-sudoku/id6787771732/reviews)** | — |
| Number of ratings | **2** | — |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | **Monthly** | Every 6 weeks |
| Monetization | Free with in-app purchases | — |
| Size | 13 MB | 20 MB |
| Requires iOS | 17.0 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Velcairn Studios LLC](https://appshunter.io/developer/6787771734) | [Nikolai Schramenko](https://appshunter.io/developer/1896009346) |

## What reviewers say

### 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


### CROSSUP

[App page](https://appshunter.io/ios/app/crossup/id6788749586)

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

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Ocean Breeze | $1.99 | one-time |
| Royal Library | $1.99 | one-time |
| Emerald Palace | $1.99 | one-time |
| Lavender Fields | $1.99 | one-time |
| Sunset Coast | $1.99 | one-time |
| Midnight Black | $1.99 | one-time |
| Japanese Zen | $1.99 | one-time |
| Arctic Blue | $1.99 | one-time |
| Vintage Newspaper | $1.99 | one-time |
| Luxury Gold | $1.99 | one-time |


## Frequently asked questions

### Is Ninekeep free?

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

### Is CROSSUP free?

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

### Do Ninekeep or CROSSUP have ads?

Ninekeep shows ads; CROSSUP does not.

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

Ninekeep ships an update monthly, and CROSSUP every 6 weeks. Most recently, Ninekeep was updated on October 31, 2026 and CROSSUP on October 31, 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.*