# HydrogenGame vs ONE

The clearest difference is price: ONE at Free against HydrogenGame's $2.99. HydrogenGame's advantage is update cadence (weekly vs monthly) and iOS requirement (12.0 vs 15.0). On ads, in-app purchases and device support there is nothing between them.

ONE is free to download; HydrogenGame costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

HydrogenGame ships an update weekly, ONE monthly. The most recent releases landed on October 5, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | HydrogenGame | ONE |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Weekly** | Monthly |
| Size | 89 MB | 157 MB |
| Requires iOS | **12.0** | 15.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Akihiro Kakoi](https://appshunter.io/developer/1738811085) | [From Yellow To Orange Co., Ltd.](https://appshunter.io/developer/1895979938) |

## What reviewers say

### HydrogenGame

[App page](https://appshunter.io/ios/app/hydrogengame/id6480367458)

**Features:** macOS Compatibility

**In-app purchases:** none


### ONE

[App page](https://appshunter.io/ios/app/one-dot-games/id6765524645)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is HydrogenGame free?

HydrogenGame costs $2.99, with no in-app purchases.

### Is ONE free?

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

### Do HydrogenGame or ONE have ads?

Neither HydrogenGame nor ONE shows ads.

### Which is updated more often, HydrogenGame or ONE?

HydrogenGame ships an update weekly, and ONE monthly. Most recently, HydrogenGame was updated on October 5, 2026 and ONE on October 2, 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.*