Powerful Silent Timer vs Dual Screen Sync
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Powerful Silent Timer
This app provides a silent vibration alarm to prevent missing your stop on public transport or to stay focused during study. It offers customizable vibration intensity and a software lock to prevent accidental cancellation.
- 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
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[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 !!
Dual Screen Sync
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"Welcome to Dual Screen Sync! Stream with ease and enjoy a bigger, better experience on your phone."
Screenshots
Verdict
The clearest difference is price: Dual Screen Sync at Free against Powerful Silent Timer's $0.99. Powerful Silent Timer's advantage is iOS requirement (7.0 vs 16.0). On update cadence, ads, in-app purchases and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Dual Screen Sync is free to download; Powerful Silent Timer costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Powerful Silent Timer ships an update every 2 weeks, Dual Screen Sync every 3 weeks. The most recent releases landed on November 1, 2026 and October 25, 2026 respectively.
| Parameter | Powerful Silent Timer | Dual Screen Sync |
|---|---|---|
| Price | $0.99 | Free — better |
| Rating | 3.7 (3 ratings) — better | — |
| Positive reviews | 62.1% of reviews | — |
| Number of ratings | 3 — better | — |
| Update frequency | Every 2 weeks — better | Every 3 weeks |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | — |
| Devices | iPhone, iPod — better | iPhone |
| Requires iOS | 7.0 — better | 16.0 |
| Further details — not scored | ||
| Size | 3 MB | 1 MB |
| Age rating | 4+ | 17+ |
| Developer | Sho Kurozumi | Insik Shin |
In-app purchases
Powerful Silent Timer
No in-app purchases
Dual Screen Sync
No in-app purchases
Questions
Is Powerful Silent Timer free?
Is Dual Screen Sync free?
Do Powerful Silent Timer or Dual Screen Sync have ads?
Which is updated more often, Powerful Silent Timer or Dual Screen Sync?
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