# すばやく！40hz再生集中

> すばやく！40hz再生集中 (iPhone/iPad app by TORU YAMAKAWA.)

- Source: https://appshunter.io/ios/app/40hz/id6767221053 (this page in markdown: same URL + `.md`)
- Developer: [TORU YAMAKAWA](https://appshunter.io/developer/1847331833)
- Category: Lifestyle, Productivity
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 13.0 · 72 MB
- Languages: Japanese
- Released: 2026-05-14
- Data updated: 2026-07-11
- User reviews in markdown: https://appshunter.io/ios/app/40hz/id6767221053/reviews.md

## What is すばやく！40hz再生集中?

Quick 40Hz Focus is an easy-to-use focus tone player app ideal for working, studying, reading, or taking a break.

Simply open the app, select the frequency mode that suits your goal, and press play. With its simple controls, you can instantly dive into your focus time.

It features 4 frequency modes:

* **Alpha (10Hz):** For when you want to calm down or work while feeling relaxed.
* **Beta (20Hz):** For when you want to shift your mood and start light work or studying.
* **Gamma (40Hz):** For when you want to focus deeply on your tasks or clear your mind.
* **Theta (6Hz):** For when you want to take it easy, such as during breaks, meditation, or right before bed.

The timer can be set anywhere from 1 to 60 minutes, and it also includes convenient 5, 10, 15, and 30-minute presets. You can effortlessly adjust it to perfectly match your work sessions or break intervals.

During playback, a large circular dial clearly displays the current frequency, allowing for intuitive play, pause, and stop controls. The dark neon design makes the screen easy on the eyes, making it perfect for nighttime use or highly focused environments.

It also supports both Japanese and English displays.

### Main Features

* 4 frequency modes
* 10Hz, 20Hz, 40Hz, and 6Hz focus tones
* Play, pause, and stop controls
* 1 to 60-minute custom timer
* 5, 10, 15, and 30-minute presets
* Japanese and English language support
* Simple and easy-to-read dark design

Terms of Use (EULA):
https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| Remove Ads | $1.99 | per month |



## Version history (last 1 release)

### 1.0 — 2026-05-14

No release notes.

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All apps by TORU YAMAKAWA: https://appshunter.io/developer/1847331833

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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 2026-07-11.*