Comparison

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

Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.

Head to head

いもうとーく | 妹AIチャットアプリ

理想の妹といつでもチャット

Free

🎮 Games

★ 4.52 ratingsView app →

Hydrogen Voice H2

Ahh~! Sound Of Hydrogen~!

Free

🎮 Games

No ratingsView app →

About

いもうとーく | 妹AIチャットアプリ

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

Read full description

あなたの理想の妹といつでもチャットができる！やり方は簡単！「いもうとーく」をダウンロードして、メッセージを送るだけ！いつでもすぐに返信を返してくれるよ！ =====「いもうとーく」はこんな人にオススメ！！===== ・可愛い妹が欲しい人・可愛い妹に癒されたい人・日々の癒しが欲しい人・話し相手が欲しい人・暇つぶしがしたい人・悩み事があって誰かに相談したい人 =====「いもうとーく」の使い方====== 「いもうとーく」の使い方は至ってシンプル！自分好みの妹の見た目と性格を決めるだけ！あとは好きなだけ妹との会話を楽しもう！！ =====「いもうとーく」の遊び方====== ・基本は妹とたくさんチャットするだけ！・チャットをすると妹とどんどん仲良くなるよ！・仲良くなるとたくさんの妹のイラストが見れたり、様々な機能が解放されていくよ！・ボイスチャットでボイスも楽しめる！一人の理想の妹とじっくり関係を深めていくのも良し！いろんな見た目と性格の妹を試してみるのも良し！あなたの理想の妹とチャットライフを楽しもう！！ AI妹チャットアプリ「いもうとーく」を今すぐダウンロード！ Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

About

Hydrogen Voice H2

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

Read full description

Saikindekiyas... Something about health, Yes. Do you do anything for your health? Ah! I drink hydrogen water. Hydrogen water! Look at me... Ta-da! Huh? Look! Here! Huh? Isn't it amazing! What's wrong with it? It's a pan-pan! Pang-pang! That's amazing! Right? Don't you want to open it? I want to see it! Here we go! Yes! Ready! Pshhhh! Ah~!　Hydrogen sound~!　What's going on here? This stick, Hi... Just put it in the water. Uh... Voila! Poco... Pok-pok-pok-pok-pok-pok! It's true. You can see the hydrogen coming out. Yes... How much hydrogen water does one bottle of this make? Ta-da! Wow! Amazing! Wow! One stick can make 60 2L bottles! That's 60 bottles of 2L! You can make enough hydrogen water for about 2 months! Hydrogen from water Limited to one bottle per person for the first time only! 　1980 yen (tax not included) Order 0120-888-315 　Shipping cost is also not included!

Screenshots

いもうとーく | 妹AIチャットアプリ3 screens

Hydrogen Voice H24 screens

Verdict

The call

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.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

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.

UpkeepUpdate frequency

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.

Scorecard5 real differences · 5 level

いもうとーく | 妹AIチャットアプリ versus Hydrogen Voice H2: the parameters behind the verdict, then further details
Parameter	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) — better	—
Positive reviews	52.4% of reviews	100.0% of reviews — better
Number of ratings	2 — better	—
Update frequency	Every 3 weeks	Every 2 days — better
Ads	Yes	Yes
In-app purchases	Yes	No — better
Monetization	Free with in-app purchases	Ad-supported — better
Devices	iPhone, iPod	iPhone, iPad, iPod — better
Requires iOS	15.6	13.0 — better
Further details — not scored
Size	207 MB	110 MB
Age rating	12+	4+
Developer	AIXIS LLC	KAEDE Games

Customer experience

いもうとーく | 妹AIチャットアプリ

All ratings2 ratings

Positive100.0%

Neutral0.0%

Negative0.0%

Written reviews21 reviews

Positive52.4%

Neutral28.6%

Negative19.0%

Hydrogen Voice H2

Written reviews3 reviews

Positive100.0%

Neutral0.0%

Negative0.0%

In-app purchases

10 purchases

いもうとーく | 妹AIチャットアプリ

Subscriptions2

月額プラン(スタンダード)$9.991 Month
月額プラン(プロ)$19.991 Month

One-time8

2026サマーダイヤ小$2.99
2026GWダイヤ小$2.99
2026お年玉ダイヤ小$2.99

Show 5 more

追加性格セット1 - 少女・おっとり・ボーイッシュ$5.99
2026お年玉ダイヤ中$19.99
2026サマーダイヤ大(SSR確定プレゼント付き)$29.99
2026GWダイヤ大(SSR確定プレゼント付き)$29.99
2026お年玉ダイヤ大(SSR確定プレゼント付き)$29.99

None

Hydrogen Voice H2

No in-app purchases

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.