# Clue Formula vs Popdoku

The clearest difference is iOS requirement: Popdoku at 15.0 against Clue Formula's 17.0. On price, update cadence, ads and in-app purchases there is nothing between them.

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

Both ship on a similar rhythm, roughly every 4 days. The most recent releases landed on October 25, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | Clue Formula | Popdoku |
| --- | --- | --- |
| 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 | Yes |
| Ads | Yes | Yes |
| Update frequency | Every 4 days | Every 4 days |
| Monetization | Free with in-app purchases | — |
| Size | 22 MB | 232 MB |
| Requires iOS | 17.0 | **15.0** |
| Devices | iPhone, iPad, Mac | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [x2line.com LLC](https://appshunter.io/developer/425135293) | [洋毓 曹](https://appshunter.io/developer/1873317076) |

## 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 |


### Popdoku

[App page](https://appshunter.io/ios/app/popdoku-bubble-logic-puzzle/id6779693261)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $4.99 | one-time |


## Frequently asked questions

### Is Clue Formula free?

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

### Is Popdoku free?

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

### Do Clue Formula or Popdoku have ads?

Both Clue Formula and Popdoku show ads.

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

Clue Formula ships an update every 4 days, and Popdoku every 4 days. Most recently, Clue Formula was updated on October 25, 2026 and Popdoku on October 12, 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.*