AtomicClock: Exact NTP Time
AtomicClock: Exact NTP Time has 613,807 installs (+0.2% a week, measured over 12 days), rated 4.7 from 18,772 ratings, #7,585 of 244,217 in Tools.
Description
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Need the exact time to set a watch, align a wall clock, compare UTC, or catch a moment where seconds matter? AtomicClock shows precise reference time from NTP time servers in a clear analog or digital clock.
NTP servers provide network time referenced to atomic clocks. Choose a predefined or custom time server, then view local time or a UTC clock in 12-hour or 24-hour format. Use AtomicClock as an NTP clock, precision clock, reference clock, or seconds clock for manual time checks.
Practical ways to use AtomicClock
• Set a watch, wall clock, camera, or other device manually
• Compare local time with UTC
• Check precise time before an event or scheduled task
• Keep a clear clock visible while you work using picture-in-picture with Pro
Clock display and signal options
• Analog clock and digital clock views
• Custom time formats, clock faces, hands, and fonts
• Smooth, fluid second-hand movement
• Optional acoustic ticking sounds
• Greenwich Time Signal
• Home screen clock widget with time and date
• Tap actions to hide information, freeze the display, or mute ticking
For technical NTP checks, view details such as the selected time server, round-trip time, and stratum. Accuracy depends on the server, network conditions, and device behavior.
AtomicClock is designed for reference time and manual clock sync. It does not automatically change device system time. The home screen widget uses system time for technical and battery reasons.
AtomicClock is free to use. AtomicClock Pro adds preferred clock styles and fonts, many widget customization options, all tap actions, picture-in-picture, and ad removal. Pro is a one-time purchase through your Google Play account with no subscription.
Is AtomicClock: Exact NTP Time safe?
StoreTally doesn't rate safety. Here's what the store and our tracking show:
Reviews The reviews Google Play shows first (its most relevant), from the US store, in any language.
From 18,764 ratings.
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★★★★★ Dennis Mahan · 1 Nov 2026 · v2.1.23Great way to accurately set all of your clocks.
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★★★★★ Doug Vertein · 1 Nov 2026 · v2.1.23Nice app. Using it to keep my pendulum clocks super accurate. I use this app each week when I wind my clocks.
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★★★★☆ Ron McLaren · 17 Oct 2026 · v2.1.22I have been using the free version of this app for years and it has worked well. I had a recent issue though with what looked like a suspicious pop-up ad offering a Software Update. I must commend the developer on his rapid response to my concerns and his assurances that it was a legitimate Google Play ad and was not from the app. If you need accurate time this is a good app.
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★★★★★ Craig McMaster · 5 Oct 2026 · v2.1.22Simple. Effective. Lots going on but still easy. BTW, if your phone runs weirdly and nobody knows why, use this to check your phone's system clock - that can definitely cause problems if it drifts from the time standards that apps match with. You might find this let's you solve that mystery and super easily. You're welcome!
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★★★☆☆ Salvador Jimenez · 30 Sep 2026 · v2.1.22used to have an audible countdown and a distinct beep starting at 50 seconds, which was great for setting clocks with your eyes away from the phone. now the ticks are the same throughout the travel of the second hand, with slightly different "Tok" at the zero second.hope this feature gets reinstatedDeveloper reply · 2 Oct 2026I haven't removed the Greenwich time signal; try disabling the seconds audio signal, which may be what you're hearing. I'm disappointed by this review and that you didn't email me first.
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★★★★★ Lisa Stone · 18 Jun 2026 · v2.1.20This app has become very beneficial for me. I can set the clock on my phone screen that I can see plainly and clearly. With visual impairments it is sometimes difficult for me to see smaller things, especially from a distance. It is also beneficial for me to keep track of time when I'm focused on a project, to be able to have the clock right there on my ohone screen.
Growth change in installs
| Per | Growth | Growth % | Actual change | Measured over |
|---|---|---|---|---|
| day | Not enough history yet | |||
| week | +1,147 | +0.2% | +2,024 | 12.4 days |
| month | Not enough history yet | |||
| year | Not enough history yet | |||
How these figures are measured
Change in installs, scaled to each window from the real gap between crawls. A window needs a full period of history before it reports anything.
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