# drillio-Mental Math Training — Boost Math Skills & Brainpower

> Mental math training app with customizable exercises and progress tracking. (iPhone/iPad app by Ryo Iida.)

- Source: https://appshunter.io/ios/app/drillio-mental-math-training/id6444734622 (this page in markdown: same URL + `.md`)
- Developer: [Ryo Iida](https://appshunter.io/developer/1506522991)
- Category: Education, Productivity
- Price: Free with in-app purchases
- Rating: 4.50/5 from 8 App Store ratings · 20 written reviews indexed
- Age rating: 4+
- Requires: iOS 16.0 · 33 MB
- Languages: American English, Japanese
- Released: 2022-12-04
- Data updated: 2026-08-25
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/drillio-mental-math-training/id6444734622/reviews.md

## What is drillio?

Welcome to drillio-Mental Math Training, the ultimate app designed to boost your mental math skills and brain power. With drillio, you can master calculation techniques through mental math cards crafted to engage and challenge your mind.

Our app is perfect for those looking to improve their mental arithmetic skills and unleash their full cognitive potential. Whether you call it brain math or mental calculation, our mental math cards will keep your mind sharp and agile. We believe in making mental math accessible and enjoyable for everyone.

In drillio, the lessons are divided into small, manageable units designed to be both fun and easy to follow. Even if numbers aren't your strong suit, you'll find our method painless and rewarding, as you sharpen those brain math skills. Our custom cards allow for tailored practice, ensuring you can focus on areas like addition, subtraction, multiplication, and division.

To achieve mastery, practice and continuity are key. Our app not only helps you with mental math exercises but also offers a 'stats' tab. This feature lets you visualize your progress and stay motivated on your mental calculation journey. Whether you want to enhance your arithmetic abilities for everyday tasks or brain training purposes, drillio has got you covered.

Key Features:
- Comprehensive training with mental math cards covering addition, subtraction, multiplication, division, and more.
- Customizable modes to focus on specific math skills you want to improve.
- Engaging activities that transform math games into brain boosting exercises.
- A dedicated 'stats' tab for tracking your progress and staying motivated.
- Fun and interactive interface that encourages continuous learning.

Don't wait! Dive into the world of mental calculations and math skills enhancement with drillio. Whether it's mastering subtraction or honing your overall arithmetic prowess, our app is designed to help you become a mental math expert.

Start your journey today and see how much you can improve. Become more competent in mental math with drillio's brain-enhancing cards.

## Key features

- Mental math cards for calculation techniques
- Customizable practice modes
- Progress tracking via stats tab
- Engaging brain-boosting exercises
- Covers addition, subtraction, multiplication, division

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| drillio PRO campaign | $14.99 | per year |
| drillio PRO Monthly | $1.99 | per month |
| drillio PRO Annual | $14.99 | per year |


## Recent user reviews (10 of 20)

All indexed reviews: https://appshunter.io/ios/app/drillio-mental-math-training/id6444734622/reviews.md

### 5/5 — シンプルで使いやすい！

*2026-05-28*

めちゃめちゃ使わせていただいています！
レッスンとカスタムの2種類が
あるのですが、レッスンの方を
愛用してます(*ฅ́˘ฅ̀*)フラッシュ暗算を
鍛えているので、暗算の基本の足し算も
使っています(ˊᵕˋ)‪︎︎︎︎シンプルで使いやすく、
褒めてくれるので長く続くきます(ง˘ω˘  )ว
ちなみに、他のモードみたいなのもあって
やってみたんですけどおもろ！って
なりました(*´˘`*)これからも頑張ります！

### 1/5 — エラーが起こる

*2026-05-08*

そろばんを習う娘に日課で毎日5分させてすでに1年余りが経過しています。
最近「スタート！」の画面が何度も点滅してしまうエラーが頻発し、スマホ再起動をしてもダメで困っています。娘もイライラしているのでそろそろ別なアプリに変えようか検討中です。

### 5/5 — 脳トレに

*2026-01-12*

50歳、最近急に計算力が衰えてきたため数検の勉強を始めましたが、ケアレスミスが多い。もっと簡単な計算をひたすら反復したいと思ってたらちょうどいいアプリが。素晴らしいです。

### 5/5 — 分かりやすい

*2025-11-04*

解説とかしてくれてめっちゃいいと思います。

### 5/5 — すごくいい

*2025-07-23*

足し算掛け算できるのすごくいい
気に入ってます👍

**Developer response:** agera one1 さま

素敵なレビューありがとうございます！
気に入っていただいて嬉しいです。
引き続きよろしくお願いいたします。

### 5/5 — 良い

*2025-07-10*

フラッシュ暗算だけじゃなくて
普通の暗算もあるから勉強しやすいし、
広告が少ないから良い

**Developer response:** 厨二病モドキ さま

素敵なレビューありがとうございます。
気に入っていただけてとても嬉しいです。
引き続きよろしくお願いいたします。

### 4/5 — 暗算

*2025-07-06*

グッド

**Developer response:** サハユ さま

レビューありがとうございます！
星をもう1ついただけるためのご要望は、いつでもお問い合わせください。
引き続きよろしくお願いいたします。

### 5/5 — 暇な時

*2024-12-21*

電車の通学時間などで使用してます。音消せるので音楽聴きながらできてめっちゃ良いです。文句なしで⭐️5です。
強いていうなら間違えた問題をもう一回プレイする機能とか、問題を保存して間違えたやつだけしか出ないとかのとかもあれば良いかな。

**Developer response:** ___iai___　さま

素敵なレビューありがとうございます！
間違えた問題をリトライする機能や、問題の保存機能良さそうですね・・・！
開発してまいりますので、少々お待ちください！
引き続きよろしくお願いいたします！

### 4/5 — 日付の更新に難あり

*2024-12-09*

iPhone 14 で利用。
アプリを終了しない限り、日付が更新されない不具合がある。
このおかげで、うっかりアプリを再起動せずにプレイしていると、今日プレイしているのに昨日のプレイデータとして記録される。
もちろん連続記録も途切れる。

また、フラッシュ暗算プレイ時に数字の表示時間が極端に短くなる事がある。

**Developer response:** お返事が遅れてしまい申し訳ございません。

こちらの不具合ですが、改善されておりますのでぜひまた遊んでいただけると嬉しいです。
何かございましたら、お問い合わせいただけますと幸いです！
引き続きよろしくお願いいたします。

### 5/5 — レッスンの暗算の動作が重い

*2024-11-20*

iPhoneSE2を使用していますが、
レッスンの暗算のみ、ページのスクロール、実際のレッスンの挙動が重いです。
フラッシュ暗算の方は問題ありません。

アプリの内容自体は、隙間時間に暗算の勉強ができ、非常素晴らしいと思うので、是非改善してもらいたいです。

**Developer response:** absabshy さま

不具合のご報告、ありがとうございます。
こちらの不具合ですが、最新版の3.4.0で修正されているはずですので、お試しいただけますと幸いです。
よろしくお願いいたします！

## Frequently asked questions about drillio

### What math skills does drillio focus on?

drillio focuses on core mental math skills including addition, subtraction, multiplication, and division. The app provides comprehensive training with customizable cards to target specific areas you wish to improve.

### How does drillio help track progress?

drillio features a dedicated 'stats' tab that allows users to visualize their progress. This helps in staying motivated and understanding areas of improvement in mental calculation.

### Is drillio suitable for beginners?

Yes, drillio is designed to be accessible and enjoyable for everyone, even those who find numbers challenging. Lessons are divided into small, manageable units to make learning painless and rewarding.

### What devices does drillio support?

drillio is available on iPhone and iPad, making it convenient for users on the Apple ecosystem to enhance their math skills.

### What is the age rating for drillio?

drillio has an age rating of 4+, making it suitable for a wide range of users looking to develop their mental math abilities.

### How often is drillio updated?

The latest version of drillio is 3.14.0, and it was last updated on March 22, 2026. This indicates a commitment to ongoing development and improvements.

### Does drillio have ads?

Yes, drillio contains advertisements. This is common for free applications that offer in-app purchases for premium features.

### What are the subscription options for drillio PRO?

drillio offers monthly ($1.99/P1M) and annual ($14.99/P1Y) subscription plans for drillio PRO. The annual plan also includes a free trial period.

## Version history (last 5 releases)

### 3.14.0 — 2026-03-22

added another calc mode

### 3.13.0 — 2026-02-26

added challenge mode

### 3.12.0 — 2026-02-24

- added new lessons

### 3.11.1 — 2026-01-06

- minor fix

### 3.11.0 — 2025-12-31

- added campaign

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## More apps by Ryo Iida

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- [シンプルな顧客管理帳 リピログ](https://appshunter.io/ios/app/id6760475429)

All apps by Ryo Iida: https://appshunter.io/developer/1506522991

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-25.*