# Clue Formula vs Shape Sudoku

The clearest difference is review sentiment: Clue Formula at 100% against Shape Sudoku's 0%. Clue Formula also leads on update cadence (every 3 days vs every 6 days) and device support (4 vs 1). Shape Sudoku's advantage is ads (none vs shown). On price, in-app purchases and monetization model there is nothing between them.

Both are free to download. Clue Formula sells 2 one-off in-app purchases and Shape Sudoku sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Clue Formula ships an update every 3 days, Shape Sudoku every 6 days. The most recent releases landed on September 1, 2026 and September 6, 2026 respectively.

## The numbers

| Metric | Clue Formula | Shape Sudoku |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (4 ratings)](https://appshunter.io/ios/app/clue-formula/id1616776014/reviews)** | — |
| Number of ratings | **4** | — |
| Positive reviews | **100.0% of reviews** | 0.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | **Every 3 days** | Every 6 days |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 22 MB | 9 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [x2line.com LLC](https://appshunter.io/developer/425135293) | [Agata Raap](https://appshunter.io/developer/1872514072) |

## What reviewers say

### Clue Formula

[App page](https://appshunter.io/ios/app/clue-formula/id1616776014)

Engage in a 3D Mahjong puzzle game featuring IQ-test style tiles. Match selectable pairs to clear levels, with increasing difficulty as you progress. Utilize hints and shuffles to aid your gameplay and compete on leaderboards.

**Highlights:** 3D Mahjong puzzle gameplay, IQ-test style tiles, Layered 3D levels, Hint and shuffle options, Leaderboard competition, VoiceOver accessibility

**Features:** Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Hint | $0.99 | one-time |
| Shuffle | $0.99 | one-time |


### Shape Sudoku

[App page](https://appshunter.io/ios/app/shape-sudoku-form9/id6774104823)

This logic puzzle game uses shapes instead of numbers, making it accessible for those with dyscalculia, young learners, or anyone who prefers visual patterns. Enjoy daily challenges with multiple difficulty levels, helpful tools, and full accessibility features.

**Highlights:** Shape-based Sudoku logic, Daily puzzles, Five difficulty levels, Notes, undo, and hints, Colorblind-friendly design, Full VoiceOver support, No ads or tracking

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| form9+ Lifelong | $5.69 | one-time |


## Frequently asked questions

### Is Clue Formula free?

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

### Is Shape Sudoku free?

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

### Do Clue Formula or Shape Sudoku have ads?

Clue Formula shows ads; Shape Sudoku does not.

### Which is updated more often, Clue Formula or Shape Sudoku?

Clue Formula ships an update every 3 days, and Shape Sudoku every 6 days. Most recently, Clue Formula was updated on September 1, 2026 and Shape Sudoku on September 6, 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.*