AtomicClock: NTP Time
Super-precise internet time from NTP servers connected to real atomic clocks
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About
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.
Info
Genre
Tools
Rating
Rated for 3+
Release
Nov 20, 2017
Last Update
Mar 28, 2025
Gallery
Contacts
Timo Partl
Hörnlesweg 8 70794 Filderstadt Germany
Reviews
A Google user
DACri here: I love the colors to choose from and I wish it had a display widget for my home screen where the clock face can be seen on screen without me having to open the app. Not really sure why I actually need this, as my phone is automatically updated with current time and date even when I cross time zones. Anyway, I like the app. I guess, because it says ATOMIC! I would like the app much better if you had artworks similar to Salvador Dali' painting "Persistence of Time."
Crownlodge Limited
A really useful 'app' that I have been using on both mobile phones and PCs for years. Unfortunately, it is no longer available to download from Microsoft Store for Windows 8.1 Mobile or Windows 10 Mobile but, if it is already installed, it will still function correctly - so, if possible do not reset your phone or inadvertently uninstall the app because it will be lost permanently. It is still available on Windows 10 for PCs but Windows 11 will be coming 'on stream' soon, so be prepared!!
Ron D
This is the coolest clock ever! It has a very precise layout, so I can keep my antiqe cloka set as close to the most accurate time possible. I wish it had a widget that was like the default clock. But that is not a deal breaker, sbecause the digital clock is very nice, and I can?always open the default clock when I am setting my clocks. I don't purchase msny apps, but as soon as I give it a few says to make sure it stays running properly, I plan to buy tbe pro version.
A Google user
I use this app to check my own local NTP server.. You can set a custom server.. other apps you are stuck with what ever server they set it to. Would like to be able to change color of clock hands. A darn good clock buy it! I also like to use it with a big ben clock chimes! If you get server error it's you.. This Ap works flawless. I use it everyday to my own NTP server with a VPN connection And mobile data.. Works great local too. Server response problems is not the Ap's fault..
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Nice, and useful. I have it set up with the acoustic ticking plus a time signal every minute, which works as a basic exercise timer. I find it runs consistently 0.7s slower than my phone's clock and two wall-mounted radio-controlled clocks. It does, however, precisely match a third, smaller radio-controlled clock. Since the wall clocks are identical I have a 2 vs 2 competition for accuracy. I have no complaint. The author's other apps seem excellent too.
Wei Lu
Cannot calibrate system time accordingly. Thanks to your explanation now I know it's a limit of Android. I think you should make that statement apparently.
A Google user
a very nice app to have. I like having one accurate source for the correct time that is as handy as this one and as easy to navigate. Visually, it is very clean with many options for displaying the time both digital and analog. Another bonus is that it is very small and has never given any me any problems. Good job, developers.
James van Zyl
It's fantastic to know real accurate clock time. However, I would like to see how much time is lost per year.
A Google user
I don't have an easy access to a sync'ed atomic clock or a good WWV receiver anymore, so I cannot independently validate the accuracy of your clock. I am sure it is more accurate than anything else I do have access to. The first 9 years of my career were in USAF PMEL (Metrology) labs. Having an atomic clock at my fingertips again is a reassuring comfort. Thanks.
Bill Kinsman
Still is a good app. Even though the pro version is affordable. I really don't need it because I have a GPS watch. I can't bad-mouth the developer for trying to make a living. The Google ads are enough to get you to stop using the free version for sure.
Bernard Kasparas
Was great. Now you lose half the screen to Google Ad Services after 4-7 seconds and cannot get rid of it even after 'not interested in this ad' clicks. A clock that you can view for 4 seconds. Forget it. Uninstalled.