Millisecond Clock vs Top Clock
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Millisecond Clock
This app displays the most accurate time available, down to the millisecond. It's useful for measuring network delays or video streaming lag by comparing displayed time differences.
- Millisecond precision time display
- Accurate timekeeping for iPhone and iPad
- Network delay measurement
- Video streaming lag analysis
- Free to download
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Millisecond Clock shows the exact time down to 1/1000 of a second, accurate enough to measure real delay in cameras, video streams, and network connections. Point a camera at the screen and compare it to another display: the difference in milliseconds tells you exactly how much latency you are dealing with. Beyond precision, Millisecond Clock is a clock you can make your own. Every part of it, from color and font to position on screen, is yours to design. DESIGN YOUR CLOCK- 13 built-in color themes, or create unlimited custom themes with the full color picker - 30 fonts, from the classic digital LED look to elegant serif and rounded styles - Adjustable glow and shadow effects for extra depth - Drag the clock, date, and weekday anywhere on screen, and resize each one independently STAY ON TIME, YOUR WAY- 12-hour or 24-hour time, with an optional blinking colon - 9 date formats to match how you write dates - Show or hide the date and day of the week - Toggle the millisecond display on or off BUILT TO STAY ON SCREEN- Keeps your screen awake so the clock is always visible - A true universal app, designed for both iPhone and iPad Millisecond Clock is free to use, supported by ads. A one-time in-app purchase removes ads and unlocks every premium theme, no subscription required.
Top Clock
This app provides a floating clock and timer that stays visible above all other applications. It's useful for tasks like online shopping, studying with Pomodoro timers, or cooking with real-time countdowns.
- Floating clock and timer
- Millisecond timing
- Picture-in-picture window
- Adjustable size and position
- Multiple timer types (stopwatch, countdown, Pomodoro)
- Customizable colors
- One-click operation
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Top Clock is a small window floating clock that displays time and countdown on the desktop and any app. use: 1. Online shopping assistant, a small window on the shopping app displays a millisecond clock or an hourly countdown. 2. For online learning, when watching a video, the Pomodoro is displayed floating in a small window for more efficient learning. 3. Cooking timer, while using other software, a small window can view the countdown in real time. Features: 1. Millisecond timing, online shopping is one step faster. 2. A small picture-in-picture window, adjustable in size and position, can be used simultaneously with other software. 3. Various timers, including clock, stopwatch, countdown, interval timer and Pomodoro. 4. Any combination of colors. 5. The operation is simple, just one click.
Screenshots
Verdict
The clearest difference is in-app purchases: Top Clock at none against Millisecond Clock's 3. Top Clock also leads on update cadence (every 2 months vs every 6 months). Millisecond Clock's advantage is review sentiment (73% vs 61%). On price, rating, ratings volume and ads 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
Both are free to download. Millisecond Clock sells 3 one-off in-app purchases. Top Clock asks for nothing beyond the download.
On the App Store both sit at effectively the same score — 4.7 for Millisecond Clock against 4.6 for Top Clock. Both are backed by a comparable volume of ratings — 131 and 149 respectively. Written reviews are what separate them: 73% of Millisecond Clock's written reviews are positive against 61% of Top Clock's.
Millisecond Clock ships an update every 6 months, Top Clock every 2 months. Both last shipped on October 14, 2026.
| Parameter | Millisecond Clock | Top Clock |
|---|---|---|
| Price | Free | Free |
| Rating | 4.7 (131 ratings) — better | 4.6 (149 ratings) |
| Positive reviews | 72.7% of reviews — better | 61.0% of reviews |
| Number of ratings | 131 | 149 — better |
| Update frequency | Every 6 months | Every 2 months — better |
| Ads | Yes | Yes |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.0 | 15.0 |
| Further details — not scored | ||
| Size | 4 MB | 4 MB |
| Age rating | 4+ | 4+ |
| Developer | Chia-Chun Hsieh | Shenzhen Gude Aipu Technology Co., Ltd |
Customer experience
Millisecond Clock
Top Clock
In-app purchases
Millisecond Clock
- Remove Ads$0.99
- Special Offer Package$2.99
- Unlock Themes$3.99
Top Clock
No in-app purchases
Questions
Is Millisecond Clock free?
Is Top Clock free?
Which has better reviews, Millisecond Clock or Top Clock?
Do Millisecond Clock or Top Clock have ads?
Which is updated more often, Millisecond Clock or Top Clock?
Other comparisons
