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Powerful Silent Timer Downloads & RevenuePowerful Silent Timer – Vibration Alarm for Library, Train etc. · App Store

強力無音タイマー – 電車、図書館向けサイレントバイブアラームアプリ for iPhone

Powerful Silent Timer – Vibration Alarm for Library, Train etc. is #161 in Productivity Paid in Japan and charting in 2 of 30 countries we track.

Updated 9 Nov 2026 · rankings refresh through the day

DeveloperSho Kurozumi
CategoryProductivity
Price150 JPY
Released
Rating★ 4.2 (69)
Version1.1.3
Age rating4+
First seen by us 29 Sep 2026
View on the App Store ↗

Powerful Silent Timer – Vibration Alarm for Library, Train etc. update history & changes

Last change · 6 events since 9 May 2014Full timeline ↓
📈Entered the top 100📈Charting in a new country🆕First spotted by AppInsider🆕Released on the App Store
Full timeline · 5 events in the last 12 months
  2. 📈
    Powerful Silent Timer – Vibration Alarm for Library, Train etc. entered the top 100
    Top Paid · Productivity · TW
  3. 📈
    Powerful Silent Timer – Vibration Alarm for Library, Train etc. charting in a new country
    Taiwan
  5. 📈
    Powerful Silent Timer – Vibration Alarm for Library, Train etc. entered the top 100
    Top Paid · Productivity · JP
  7. 🆕
    Powerful Silent Timer – Vibration Alarm for Library, Train etc. first spotted by AppInsider
    #33 in Top Paid · Productivity · Japan
  9. 🆕
    Powerful Silent Timer – Vibration Alarm for Library, Train etc. released on the App Store

Collected from the stores by AppInsider since we first spotted the app. Dates are when we saw each change.

Rating
4.2 ★
69 ratings
Measured
Best rank now
#161
Productivity Paid
Measured

Powerful Silent Timer – Vibration Alarm for Library, Train etc. on the App Store

App details

App ID
873008064
Publisher
Sho Kurozumi
On the store since
May 2014
12 years on the store
Minimum OS
iOS 7.0+
Devices
iPhone · iPad
Content rating
4+
Languages
2
EN JA
Size
3 MB
Also listed in
Utilities