# One vs SkyTower Challenge

The clearest difference is update cadence: SkyTower Challenge at every 2 weeks against One's every 16 months. 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.

One ships an update every 16 months, SkyTower Challenge every 2 weeks. The most recent releases landed on September 17, 2026 and September 16, 2026 respectively.

## The numbers

| Metric | One | SkyTower Challenge |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | Yes | Yes |
| Update frequency | Every 16 months | **Every 2 weeks** |
| Size | 70 MB | 171 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Shinichi Takayama](https://appshunter.io/developer/1452771438) | [Takuma Takahashi](https://appshunter.io/developer/1704744113) |

## What reviewers say

### One

[App page](https://appshunter.io/ios/app/one-two-stack/id1458909941)

**Features:** macOS Compatibility

**In-app purchases:** none


### SkyTower Challenge

[App page](https://appshunter.io/ios/app/skytower-challenge/id6464111672)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is One free?

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

### Is SkyTower Challenge free?

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

### Do One or SkyTower Challenge have ads?

Both One and SkyTower Challenge show ads.

### Which is updated more often, One or SkyTower Challenge?

One ships an update every 16 months, and SkyTower Challenge every 2 weeks. Most recently, One was updated on September 17, 2026 and SkyTower Challenge on September 16, 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.*