# Rule Shift Puzzle vs DuoBoard

The clearest difference is iOS requirement: Rule Shift Puzzle at 15 against DuoBoard's 26.4. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

## The numbers

| Metric | Rule Shift Puzzle | DuoBoard |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 8 days | — |
| Size | 7 MB | 5 MB |
| Requires iOS | **15** | 26.4 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [仲琼 蒋](https://appshunter.io/developer/1881572134) | [Said Lamaarague](https://appshunter.io/developer/1539332700) |

## What reviewers say

### Rule Shift Puzzle

[App page](https://appshunter.io/ios/app/rule-shift-puzzle/id6761166433)

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

**In-app purchases:** none


### DuoBoard

[App page](https://appshunter.io/ios/app/duoboard/id6762021908)

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

**In-app purchases:** none


## Frequently asked questions

### Is Rule Shift Puzzle free?

Rule Shift Puzzle is free to download, with no in-app purchases.

### Is DuoBoard free?

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

### Do Rule Shift Puzzle or DuoBoard have ads?

Neither Rule Shift Puzzle nor DuoBoard shows ads.

---

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