AtomicClock: NTP Time

Contains adsIn-app purchases
13.2K reviews
Content rating
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About this app

Ever wanted to know exact current time to celebrate someone's birthday or New Year's Eve? Or simply to synchronize clocks? AtomicClock provides the accurate time from NTP servers which are getting the time directly from atomic clocks!

• current precise time in correct time format
• analog & digital clock
• choose from different time servers or add own ones
• customizable widget with time & date
• acoustic ticking & fluid second hand
• choose between different clock faces
• switch between local time and UTC, 24-hour and 12-hour clock
• sync your physical watches & clocks
• technical info like round trip time or stratum
• Greenwich Time Signal

AtomicClock: The most accurate time on Android.
Updated on
Apr 19, 2023

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.
This app may share these data types with third parties
Location, App activity and 2 others
This app may collect these data types
Location, App activity and 2 others
Data is encrypted in transit
You can request that data be deleted

Ratings and reviews

12.2K reviews
Paul M
September 19, 2023
This app is very useful and extremely accurate and I think it is one of the best time keeping apps around. However I really need the ability to reorder the weekday, date, and time (so I can put the time on top, and weekday on the bottom, with date in the middle) as for my specific use case it would increase visibility while still having all information there. Please add this ability, and perhaps expand the colors and font sizes available, and it would be even closer to perfect! Thank you
1 person found this review helpful
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A Google user
November 25, 2019
I installed and tested more than 2doz clock apps to find the best one. This one is head and shoulders above the rest. I love everything about it. The numbers on the digital clock are large and easy to read. Love being able to customize the analog clock with different faces/numbers (or no numbers) and hand styles, fluid or ticking seconds hand and different clock colors to make it easier to read. Ads are not intrusive. Worst thing is not having enough characters to say all of the things I love...
44 people found this review helpful
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Timo Partl
November 25, 2019
Thanks so much for your nice review Richard! I am so happy you enjoy the app that much. Your kind words brightened my day :)
Steven Christenson
May 2, 2021
Could this app be prettier and solve the problem of world hunger? Maybe. But I really use it for only two purposes. 1. To double check my current android clock setting. 2. To get sub-second accuracy for time critical events. On several occasions now, I've used Atomic Clock to know exactly when to start my high speed frame capture to catch the International Space Station has it hurtles across the face of the sun. You cannot SEE the space station, and the sun is blinding. You also cannot watch through the solar filtered eyepiece and try to start the capture when you SEE the shadow of the space station... that would be WAY, way too hard because it takes just ONE SECOND for the whole thing to happen. So far every attempt I've made using solely the prediction data and the Atomic Clock on my cell phone has resulted in EXACT hits! While my cell phone was CLOSE to correct, todays error of 0.4 seconds means I'd would have missed half of the transit! Having this level of accuracy is well worth the few dollars to upgrade to the pro version. Without it, I'd have no bragging rights. My one wish is that the hands of the analog clock could be made a different color from the face of the clock. The hands don't stand out well against some of the clock faces. I also like having the Widget displaying a time I can trust (and get quick access to the details).
24 people found this review helpful
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Timo Partl
May 6, 2021
Thanks for your review! Wish I could solve the world hunger with this app 😅 Thanks for describing how you are using the app - this is tremendously interesting, very cool! Unfortunately the widgets cannot be used to accurately, reliably und efficiently display the NTP time, therefore they are showing the device time