ATclock vs Millisecond Clock
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
ATclock
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The APP ATClock is for controlling the LED clock. Users can view the information anytime and anywhere after connecting. You can easily set the alarm, count down timer, brightness, switch the temperature unit, etc.
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.
Screenshots
Verdict
The clearest difference is in-app purchases: ATclock at none against Millisecond Clock's 3. ATclock also leads on ads (none vs shown) and update cadence (weekly vs every 6 months). On price 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
Both are free to download. Millisecond Clock sells 3 one-off in-app purchases. ATclock asks for nothing beyond the download.
ATclock ships an update weekly, Millisecond Clock every 6 months. The most recent releases landed on September 20, 2026 and October 14, 2026 respectively.
| Parameter | ATclock | Millisecond Clock |
|---|---|---|
| Price | Free | Free |
| Rating | — | 4.7 (131 ratings) — better |
| Positive reviews | — | 72.7% of reviews |
| Number of ratings | — | 131 — better |
| Update frequency | Weekly — better | Every 6 months |
| Ads | No — better | Yes |
| In-app purchases | No — better | Yes |
| Monetization | — | Free with in-app purchases |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 9.0 — better | 15.0 |
| Further details — not scored | ||
| Size | 11 MB | 4 MB |
| Age rating | 4+ | 4+ |
| Developer | ADSMART TECHNOLOGY LIMITED | Chia-Chun Hsieh |
In-app purchases
ATclock
No in-app purchases
Millisecond Clock
- Remove Ads$0.99
- Special Offer Package$2.99
- Unlock Themes$3.99









