# Clue Formula vs DuoDom

The clearest difference is in-app purchases: DuoDom at none against Clue Formula's 2. DuoDom also leads on ads (none vs shown). Clue Formula's advantage is update cadence (every 4 days vs monthly). On price, device support and iOS requirement there is nothing between them.

Both are free to download. Clue Formula sells 2 one-off in-app purchases. DuoDom asks for nothing beyond the download.

Clue Formula ships an update every 4 days, DuoDom monthly. The most recent releases landed on October 16, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | Clue Formula | DuoDom |
| --- | --- | --- |
| 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 | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Every 4 days** | Monthly |
| Monetization | Free with in-app purchases | — |
| Size | 22 MB | 1 MB |
| Requires iOS | 17.0 | 17.0 |
| Devices | **iPhone, iPad, Mac** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [x2line.com LLC](https://appshunter.io/developer/425135293) | [Josef Sejrek](https://appshunter.io/developer/481227872) |

## 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 |


### DuoDom

[App page](https://appshunter.io/ios/app/duodom/id6767910027)

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

**In-app purchases:** none


## Frequently asked questions

### Is Clue Formula free?

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

### Is DuoDom free?

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

### Do Clue Formula or DuoDom have ads?

Clue Formula shows ads; DuoDom does not.

### Which is updated more often, Clue Formula or DuoDom?

Clue Formula ships an update every 4 days, and DuoDom monthly. Most recently, Clue Formula was updated on October 16, 2026 and DuoDom on October 1, 2026.

---

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