# Calc Training (30sec)

> Fast-paced mental arithmetic training app with timed challenges. (iPhone/iPad app by Tomohiro Ohwada.)

- Source: https://appshunter.io/ios/app/calc-training-30sec/id1547381216 (this page in markdown: same URL + `.md`)
- Developer: [Tomohiro Ohwada](https://appshunter.io/developer/991660409)
- Category: Navigation, Education
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 15.0 · 8 MB
- Languages: American English, Japanese
- Released: 2021-01-08
- Data updated: 2026-09-06
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/calc-training-30sec/id1547381216/reviews.md

## What is Calc Training (30sec)?

You can practice mental arithmetic in 30 seconds.
Train your math skills by doing more mental arithmetic.

■5 types of training
- Addition
- Subtraction
- Multiplication
- Split
- mix

■Features
- 30 seconds of intensive training
- Personal best confirmation


■Credit
SE -> OtoLogic (https://otologic.jp/)
BGM -> Pocket Sound (https://pocket-se.info/)

## Key features

- 30-second intensive training sessions
- Addition practice
- Subtraction practice
- Multiplication practice
- Mixed problem training
- Personal best tracking

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Remove Ads | $1.99 | one-time |
| Development support | $1.99 | one-time |
| Remove Ads & Support | $2.99 | one-time |


## Recent user reviews (10 of 17)

All indexed reviews: https://appshunter.io/ios/app/calc-training-30sec/id1547381216/reviews.md

### 3/5 — 暇つぶしにはよい

*2026-02-02, version 1.4.0*

頭の体操、暗算力を鍛えるにはちょうどいいが
スタートを押すとすぐに問題が始まってしまうので注意
カウントダウンを挟んでもらえると心構えができるので改善求む

### 4/5 — とても良いです

*2024-02-23, version 1.3.3*

ずこくいいです

### 5/5 — 僕の今の目標は30てんですがいまは25てんです

*2024-01-06, version 1.3.3*

ぼくはこれからもあきらめずに30てんのもくひょうをたっせいするためにがんばります！

### 5/5 — 最高！

*2023-11-08, version 1.3.3*

また使いたい！

### 2/5 — 小学生低学年の子供向け

*2022-08-25, version 1.3.0*

割り算は、答えの８割が「1」か「2」だった。
さすがにもう少しひねるか、難易度が変えられてほしい。

一度やって、すぐにアンインストールしてしまった

### 5/5 — 楽しい

*2022-07-03, version 1.2.1*

BGMが良い感じ♪
控えめに言って最高ですね😇

### 3/5 — シンプルだけど好き

*2022-06-04, version 1.1.1*

昔の100マス計算させられてた時の急がなきゃって気持ちとなんだってっけ気持ちが入り混じってめちゃ楽しいです

### 3/5 — テンポいい

*2022-05-21, version 1.1.1*

どんどんチャレンジしたくなるアプリ

### 4/5 — よい

*2022-01-18, version 1.1.1*

よきかな

### 5/5 — 良い

*2022-01-06, version 1.1.1*

子供に口で答え言ってもらい大人が答えを打って…という使い方しました。とても使いやすいです。
秒数を選べたらいいなと思いました。もう少し秒数長めにやりたいです。

## Frequently asked questions about Calc Training (30sec)

### What types of math problems can I practice with Calc Training?

Calc Training offers practice in five types of arithmetic: addition, subtraction, multiplication, split (division), and mixed problems. This variety ensures a comprehensive workout for your mental math abilities.

### How long are the training sessions in Calc Training?

Each training session in Calc Training is designed to be intensive and lasts exactly 30 seconds. This short duration makes it easy to fit practice into even the busiest schedules.

### Can I track my progress with Calc Training?

Yes, Calc Training allows you to confirm your personal best scores for each training type. This feature helps you monitor your improvement over time and stay motivated.

### Does Calc Training have ads?

Yes, Calc Training contains advertisements. These ads help support the development and maintenance of the app.

### What devices is Calc Training available on?

Calc Training is available for iPhone and iPod devices. It is designed to run on these Apple platforms.

### How often is Calc Training updated?

The latest version of Calc Training is 1.4.0, last updated on October 10, 2025. This indicates regular updates to improve the app.

### What is the age rating for Calc Training?

Calc Training has an age rating of 4+, making it suitable for young children and older users alike. It's designed for a broad audience interested in math practice.

### Is Calc Training free to download?

Yes, Calc Training is free to download and use. It offers in-app purchases, which may provide additional features or content.

## Version history (last 5 releases)

### 1.4.0 — 2025-10-10

Compatible with iOS26.
Library updated.

### 1.3.3 — 2023-08-10

Minor fix.

### 1.3.2 — 2022-12-08

Updated library.

### 1.3.1 — 2022-10-18

Updated library.

### 1.3.0 — 2022-08-04

Added a setting to eliminate the time limit.

## Apps similar to Calc Training (30sec)

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [ポケットマップ - 地図のブックマークをフォルダで簡単に管理](https://appshunter.io/ios/app/id557509396) | 3.5 (2) | Free | Navigation |
| [Hot spring spa information Map](https://appshunter.io/ios/app/hot-spring-spa-information-map/id1020003034) | 3.0 (3) | Free | Navigation |
| [読み上げ「ゆっくり棒読みトーク」](https://appshunter.io/ios/app/id542600107) | 4.8 (61) | Free | Navigation |
| [効果音 -【決定版】ライブ配信イベントで使える](https://appshunter.io/ios/app/id1236458313) | 5.0 (1) | Free | Navigation |
| [TopReader](https://appshunter.io/ios/app/topreader/id1487352741) | — | Free | Navigation |
| [Tracer - Easy Location Logger](https://appshunter.io/ios/app/tracer-easy-location-logger/id1136146951) | — | Free | Navigation |

## More apps by Tomohiro Ohwada

- [SoundEffect App](https://appshunter.io/ios/app/soundeffect-app/id1124954405)
- [勘定科目1分トレーニング](https://appshunter.io/ios/app/1/id1132641353)
- [Relax Sounds App](https://appshunter.io/ios/app/relax-sounds-app/id1231260136)
- [WaterSounds](https://appshunter.io/ios/app/watersounds/id1260518740)
- [コンビニ検索・周辺施設検索](https://appshunter.io/ios/app/id1352735706)
- [MIXOUND - Acapella App](https://appshunter.io/ios/app/mixound-acapella-app/id1452582507)

All apps by Tomohiro Ohwada: https://appshunter.io/developer/991660409

---

*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 2026-09-06.*