Atomic Time - NTP Clock Sync

5.16K reviews
Content rating
Everyone
100K+
Downloads
Content rating
Everyone
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About this app

Step into the world of unparalleled accuracy with Atomic Time, the premier clock app. It redefines the standard for timekeeping by providing users with the most accurate time, meticulously synchronized with global NTP servers. Witness the essence of time through our elegantly minimalist analog display, beautifully paired with a crystal-clear digital clock beneath.

Especially valuable for enthusiasts and professionals alike, Atomic Time serves as a trusted reference for checking the accuracy of watches and setting them to the precise second. Crafted for simplicity and readability, this app is the definitive choice for anyone who values precision and style.

- Elegant Design: Enjoy a minimalist graphical analog clock along with a digital display, crafted for optimum clarity and aesthetic appeal.

- Customizable Themes: Personalize your clock with multiple color schemes such as Light, Dark, and Black (optimized for OLED displays). Dive into a world of color with variations like Warm Blaze, Pink Candy, and Bluebird to match your mood or decor.

- Time Server Selection: Choose from a wide array of time servers to sync with, ensuring you always have the fastest and most reliable connection.

- Sound & Display Settings: Customize your app with options to turn sound on or off, keep the display active, and select your preferred second hand animation – tick or sweep.

- Lightweight & Fast: Atomic Time is designed to be both fast and light, ensuring minimal impact on your device’s performance.
Get the most accurate time with this NTP server synchronized atomic clock.
Updated on
Aug 12, 2025

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
  • No data shared with third parties
    Learn more about how developers declare sharing
  • No data collected
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Ratings and reviews

4.76K reviews
Mark Zinzow
March 30, 2024
I got tired of that other app that's so full of ads and switched to this. It has everything I need: a basic simple clockface with accurate time. I would like a palette of tertiary colors though, for both the background as well as the borders. The new dull earth tones are boring, not to mention the strange color names are unfamiliar. I assume they are new as purple is shown in the screen shots, but not available in the app when I downloaded it today.
27 people found this review helpful
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Gregg Aronson
October 8, 2021
The Atomic Time app shows how much your phone is out of sync with NIST time. It updates every 30 seconds, and it indicates varying discrepancies between the phone's clock and NIST. It does not actually correct your phone's clock. I have checked this app against the time.gov (NIST's) website, and they both indicate similar results. I have been able to re sync my phone's clock with NIST by restarting my phone, and this app and the NIST website verify this. It is a very quick way to check the accuracy of your phone's clock. This app is very useful for adjusting clocks and watches that you have around the house that must be set manually. The display and sound are very useful for this. It is a great app for DST and standard time changes.
67 people found this review helpful
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Steve
March 23, 2025
I'm confused. 🤨 This app doesn't require payment? Or an ongoing subscription?? And it doesn't have an infestation of ads??? 🧐 You mean... It's just a simple, beautifully designed app which does exactly what it's meant to do???? How rare and refreshing! Thank you, dev. This will be a fantastic replacement for the old retired ClockSync app. I use it for setting my clocks after time changes or power outages. 🙂
40 people found this review helpful
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What’s new

- fixed layout crop
- fixed large offset display