# Stack vs O vs X Duel

The clearest difference is ads: Stack at none against O vs X Duel's shown. O vs X Duel's advantage is iOS requirement (13.0 vs 18.0). On price, update cadence, 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.

Both ship on a similar rhythm, roughly weekly. The most recent releases landed on October 18, 2026 and October 15, 2026 respectively.

## The numbers

| Metric | Stack | O vs X Duel |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Weekly | Weekly |
| Size | 14 MB | 115 MB |
| Requires iOS | 18.0 | **13.0** |
| Devices | iPhone, iPad, Apple Watch | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Hemal Modi](https://appshunter.io/developer/1522352514) | [Cheng-Kai Wu](https://appshunter.io/developer/1824246427) |

## What reviewers say

### Stack

[App page](https://appshunter.io/ios/app/stack-block-puzzle-for-watch/id6746418627)

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases:** none


### O vs X Duel

[App page](https://appshunter.io/ios/app/o-vs-x-duel/id6748151029)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Stack free?

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

### Is O vs X Duel free?

O vs X Duel is free to download, with no in-app purchases.

### Do Stack or O vs X Duel have ads?

O vs X Duel shows ads; Stack does not.

### Which is updated more often, Stack or O vs X Duel?

Stack ships an update weekly, and O vs X Duel weekly. Most recently, Stack was updated on October 18, 2026 and O vs X Duel on October 15, 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.*