# Powerful Silent Timer – Vibration Alarm for Library, Train etc.

> Silent vibration alarm for commuters and students, preventing missed stops. (iPhone/iPad app by Sho Kurozumi.)

- Source: https://appshunter.io/ios/app/powerful-silent-timer-vibration-alarm-for-library-train-etc/id873008064 (this page in markdown: same URL + `.md`)
- Developer: [Sho Kurozumi](https://appshunter.io/developer/796307880)
- Category: Productivity, Utilities
- Price: $0.99
- Rating: 3.70/5 from 3 App Store ratings · 29 written reviews indexed
- Age rating: 4+
- Requires: iOS 7.0 · 3 MB
- Languages: American English, Japanese
- Released: 2014-05-09
- Data updated: 2026-09-02
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/powerful-silent-timer-vibration-alarm-for-library-train-etc/id873008064/reviews.md

## What is Powerful Silent Timer?

[Attending school, commuting must-have app! ! ][For a limited time only] 
This is the best silence timer to prevent riding-past of bus and train. 

It will awaken you with powerful vibration when time has come. 

You can set an alarm on three stages. Silent, Normal, and Powerful. 

Silent ... At regular intervals. Longer interval. 
Normal ... At regular intervals. Shorter interval. 
Powerful ... MAXIMUM. 

To prevent accidentally timer cancel, it is equipped with a software lock function. 
Also during using the software lock function, you can check timer working. 
So you can feel safe. 

I recommend for people who want to take advantage of time commuting or during commute !!

## Key features

- Silent vibration alarm
- Customizable vibration intensity (Silent, Normal, Powerful)
- Software lock to prevent accidental cancellation
- Timer status check during lock
- Ideal for commuting and study

## Recent user reviews (10 of 29)

All indexed reviews: https://appshunter.io/ios/app/powerful-silent-timer-vibration-alarm-for-library-train-etc/id873008064/reviews.md

### 1/5 — No seconds. Useless

*2025-08-04, version 1.1.3*

No seconds. Useless

### 5/5 — Brilliant

*2020-10-03, version 1.1.3*

Needed an alarm to wake me and not my wife. It works perfectly however I am a light sleeper, not sure even the powerful vibration would wake a heavy sleeper but for me it is great

### 5/5 — 電車で安心して寝られます

*2019-08-23*

乗り過ごし防止でお世話になってます。
ゲームなどで○○分後にイベント開始！なんて時にも便利。

シンプルで使いやすく、アイコンも素朴で私は好きです。

### 5/5 — 知らせる回数を指定したい

*2019-07-10*

静かな場所で使う際には、連続して振動するのは使いづらいところがあります。
振動回数を指定できると、いいかも、です。そのつもりで利用しているのであれば、一回振動すれば気がつきますので。

### 1/5 — 強力どころじゃない

*2019-04-10*

バイブ鳴りません。
通知すらでない。

### 1/5 — Does not vibrate phone

*2019-01-24*

This app just states time up on a screen with no phone vibration

### 2/5 — Doesn’t work with screen locked

*2019-01-19, version 1.1.3*

This app dies exactly what it says but there is one glaring flaw.  If you lock your phone the timer can’t execute the vibrations and you get nothing.  This is functionality I would expect from free or ad funded software but I was expecting more from a paid app even if it’s only a buck.  Disappointed

### 1/5 — バイブが起動しない

*2018-09-06*

タイマーがゼロになってもバイブが起動しません。
評価が高かったので購入しましたが、メインの機能が使えないのは残念でした。

### 5/5 — 隣に人が居る時に重宝

*2018-08-06*

職場で昼寝や夜は隣に子どもが寝てる時などに利用してます。旧いiPhoneを目覚ましとして使用してるので純正品は無音できないため、と強力なバイブができるので重宝してます。

### 5/5 — 優良

*2017-10-30*

シンプルイズベスト

## Frequently asked questions about Powerful Silent Timer

### What is the main purpose of Silent Timer?

Silent Timer is designed to alert you with vibration, preventing you from missing your bus or train stop, or to help you focus during study sessions without audible noise.

### Does Silent Timer have ads?

No, Silent Timer is ad-free, providing an uninterrupted user experience.

### How much does Silent Timer cost?

Silent Timer is a paid app, available for a one-time purchase of $0.99.

### What devices is Silent Timer compatible with?

Silent Timer is supported on iPhone and iPod devices.

### Can I customize the vibration strength in Silent Timer?

Yes, you can choose from three vibration stages: Silent, Normal, and Powerful, to suit your needs.

### Is there a way to prevent accidentally canceling the timer in Silent Timer?

Yes, Silent Timer includes a software lock function to prevent accidental cancellation, and you can still check the timer's status while it's locked.

### How often is Silent Timer updated?

The latest version, 1.1.3, was released on October 9, 2015. Updates are not frequent, with the last update being several years ago.

### What is the age rating for Silent Timer?

Silent Timer has an age rating of 4+, making it suitable for a wide range of users.

## Version history (last 5 releases)

### 1.1.3 — 2015-10-09

This update from Apple will improve the functionality of this app. No new features are included.

Small Bug fix for iOS 9

### 1.1.1 — 2015-09-29

Bug fix for iOS 7 .

### 1.1.0 — 2015-09-12

Added notification permission dialog.

### 1.0.4 — 2014-07-06

Changed SDK.

### 1.0.3 — 2014-06-07

Repair the potential bugs.

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## More apps by Sho Kurozumi

- [Nanameyomi Maker](https://appshunter.io/ios/app/nanameyomi-maker/id796307877)
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- [PatternMaker - Original Pattern Wallpaper From Your Name For Free  iPhone](https://appshunter.io/ios/app/patternmaker-original-pattern-wallpaper-from-your-name-for-free-iphone/id854860195)
- [Fit Photo as Wallpaper](https://appshunter.io/ios/app/fit-photo-as-wallpaper/id863094731)

All apps by Sho Kurozumi: https://appshunter.io/developer/796307880

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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 2026-09-02.*