# いもうとーく | 妹AIチャットアプリ vs Hydrogen Voice H2

The clearest difference is review sentiment: Hydrogen Voice H2 at 100% against いもうとーく | 妹AIチャットアプリ's 52%. Hydrogen Voice H2 also leads on in-app purchases (none vs 10) and update cadence (every 2 days vs every 3 weeks). On price, ads and device support there is nothing between them.

Both are free to download. いもうとーく | 妹AIチャットアプリ sells 10 in-app purchases, starting at $9.99 per month. Hydrogen Voice H2 asks for nothing beyond the download.

いもうとーく | 妹AIチャットアプリ ships an update every 3 weeks, Hydrogen Voice H2 every 2 days. The most recent releases landed on November 3, 2026 and November 4, 2026 respectively.

## The numbers

| Metric | いもうとーく | 妹AIチャットアプリ | Hydrogen Voice H2 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (2 ratings)](https://appshunter.io/ios/app/ai/id6449149386/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 52.4% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | Yes | Yes |
| Update frequency | Every 3 weeks | **Every 2 days** |
| Monetization | Free with in-app purchases | **Ad-supported** |
| Size | 207 MB | 110 MB |
| Requires iOS | 15.6 | **13.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 12+ | 4+ |
| Developer | [AIXIS LLC](https://appshunter.io/developer/1879493586) | [KAEDE Games](https://appshunter.io/developer/1511783814) |

## What reviewers say

### いもうとーく | 妹AIチャットアプリ

[App page](https://appshunter.io/ios/app/ai/id6449149386)

Engage in conversations with your ideal virtual sister. Customize her appearance and personality, then chat to deepen your bond. Unlock exclusive illustrations and voice features as your relationship grows.

**Highlights:** AI-powered chat, Customizable sister appearance, Customizable sister personality, Unlockable illustrations, Voice chat features, Relationship building

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

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 月額プラン(スタンダード) | $9.99 | per month |
| 月額プラン(プロ) | $19.99 | per month |
| 2026サマーダイヤ小 | $2.99 | one-time |
| 2026GWダイヤ小 | $2.99 | one-time |
| 2026お年玉ダイヤ小 | $2.99 | one-time |
| 追加性格セット1 - 少女・おっとり・ボーイッシュ | $5.99 | one-time |
| 2026お年玉ダイヤ中 | $19.99 | one-time |
| 2026サマーダイヤ大(SSR確定プレゼント付き) | $29.99 | one-time |
| 2026GWダイヤ大(SSR確定プレゼント付き) | $29.99 | one-time |
| 2026お年玉ダイヤ大(SSR確定プレゼント付き) | $29.99 | one-time |


### Hydrogen Voice H2

[App page](https://appshunter.io/ios/app/hydrogen-voice-h2/id6473839795)

This app demonstrates the creation of hydrogen water using a special stick. It shows how the stick releases hydrogen bubbles into water and highlights the quantity of hydrogen water that can be produced.

**Highlights:** Hydrogen water creation demonstration, Visual display of hydrogen bubbles, Information on production volume, Highlights the use of a hydrogen stick, Shows how to use the product

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is いもうとーく | 妹AIチャットアプリ free?

いもうとーく | 妹AIチャットアプリ is free to download, with in-app purchases available.

### Is Hydrogen Voice H2 free?

Hydrogen Voice H2 is free to download, with no in-app purchases.

### Do いもうとーく | 妹AIチャットアプリ or Hydrogen Voice H2 have ads?

Both いもうとーく | 妹AIチャットアプリ and Hydrogen Voice H2 show ads.

### Which is updated more often, いもうとーく | 妹AIチャットアプリ or Hydrogen Voice H2?

いもうとーく | 妹AIチャットアプリ ships an update every 3 weeks, and Hydrogen Voice H2 every 2 days. Most recently, いもうとーく | 妹AIチャットアプリ was updated on November 3, 2026 and Hydrogen Voice H2 on November 4, 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.*