AtomicClock: NTP Time

Contains adsIn-app purchases
4.8
16.5K reviews
100K+
Downloads
Content rating
PEGI 3
Screenshot image
Screenshot image
Screenshot image
Screenshot image
Screenshot image
Screenshot image

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
Mar 28, 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.
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
Data can’t be deleted

Ratings and reviews

4.8
15.3K reviews
-
May 21, 2024
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.
2 people found this review helpful
Did you find this helpful?
Philip Luck
July 27, 2021
A nice app, and I'd like to buy the 'pro' version, but for two things. Firstly, it's not possible to get the app to set the correct time on the phone (although that might be an Android limitation). Secondly - and this is the game changer - the widget displays the phone time, not the ntp synchronised time. ETA: Apparently it's not possible to have a battery efficient widget that syncs with ntp time. However it is possible to set the system time programmaticaly, and disable network sync.
8 people found this review helpful
Did you find this helpful?
Timo Partl
July 27, 2021
Hi Philip, thanks for your review. It is not possible to set the system time programmatically on a unrooted phone due to Android security measures. No app can do that.
Crownlodge Limited
July 5, 2021
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!!
10 people found this review helpful
Did you find this helpful?