Atomic Clock & Watch Accuracy combines precise NTP-based time synchronization with wristwatch accuracy tracking, all in one utility. With a solid 4.80 rating from 16,810 ratings and 100,000+ total downloads (1.8K in the last 30 days), it maintains a notable presence in the TOOLS category, though it isn’t ranked in any top list.
Pros & Cons
Dual functionality: time sync via NTP and wristwatch tracking
CSV export for data analysis
Share accuracy charts with friends
Free core features with optional premium upgrade
Lacks a dedicated digital screen/widget or on-device display features that some competitors offer
No built-in digital/analog clock widget or extensive display customization compared to some rivals
About Atomic Clock & Watch Accuracy
Atomic Clock & Watch Accuracy is a tools app developed by Tomas Hubalek.
Download Statistics
Atomic Clock & Watch Accuracy has been downloaded 470 thousand times. In the last 30 days, the app was downloaded 1.8 thousand times.
User Ratings
Atomic Clock & Watch Accuracy is rated 4.82 out of 5 stars. The rating is based on 17 thousand ratings.
App Information
Atomic Clock & Watch Accuracy is FREE to download. The APK download size is 31.33 MB. The latest version available is 3.1.11. The last update was on June 3, 2026.
Technical Requirements
The app has a content rating of Everyone. The app has been available on Google Play since June 2018.
Description
This app has two main features: - it detects and shows exact time (via NTP protocol). It can be helpful if you want to sync time on some of your devices with atomic clock. - it allows to track accuracy of your wristwatches. It can be helpful if you want to know how exact your wristwatch is. You can share this information with watchmaker and it helps him to adjust your watches properly.
Features in detail:
Atomic Time from NTP Servers - Most accurate time on the earth is provides by Atomic clocks. To synchonize computer/phone clock with atomic clock you can use Network Time Protocol servers. - This app is able to connect to NTP time servers and show you exact time - There is list of NTP Time Servers (including goverment time servers like NIST Internet Time Service) - On Android 8 you can use Picture-in-Picture function and adjust your clock according excact time shown in small window over other apps.
Watch accuracy tracking app With this app you can - track accuracy of your wristwatch collection (works well for both mechanical and quartz watches) - simply tap in the app, let app know what time was shown on wristwatch and app will do all the statistics and show you watch accuracy chart - share accuracy chart with your friends on social networks - export your accuracy data as CSV for further processing
Free vs. paid functionality - basic app functionality is for free. You can check exact time for free. You can track one of your watches for free. - premium functionality is paid feature
Feel free to contact us if you find any bug and/or you want to suggest some improvement.
Recent changes: Release notes for version 3.1.x -------------------------------- - Note on watch list screen is no longer limited to two lines (version 3.1.9) - Refactoring of dialogs + minor bugs fixed (version 3.1.6) - Fixed minor UI and UX bugs (version 3.1.5) - Fixed bugs comming from beta testing (version 3.1.4)
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Comments on Atomic Clock & Watch Accuracy for Android
★★★★★Brian Copeland· Jul 5, 2026
WOW! The most accurate clock I have come across, so I use it for everything, including BST twice yearly. It's amazing how inaccurate other clocks are, when checked against yours!
★★★★★Bennett Todd· Jul 25, 2026
Seems to work just as I hoped, no surprises. I wasn't sure from the in-app explanation, but the "Premium" upgrade in fact turned off the advertising, whew. Watch setting isn't all that exotic, though it's nice that this references both your device time and NTP, and tells you the difference, and does the minute approaching beep thing. But the trick of logging watch accuracy over time is fun, and seems well done.
★★★★★Keith S· Apr 29, 2026
Excellent tool. I use it every morning to reference the time on my automatic watches. If you have a mechanical watch then this is for you
★★☆☆☆Kürşad İmga· Aug 6, 2026
It is freezing when I open the app. Sometimes working after 1–2 minutes, sometimes staying frozen.
★☆☆☆☆Stuart Harrell· May 20, 2026
This app turns into an ad when minimized, making it useless. It doesn't even deserve one star.
Google Play Rankings for Atomic Clock & Watch Accuracy
This app is not ranked
Technologies used by Atomic Clock & Watch Accuracy
15 permissions·35 libraries
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Trust & Safety: The app requests ad-related identifiers, network state, internet access, foreground service, push notifications, license checks, and Google services. These are typical for a free, ad-supported app and do not indicate access to sensitive data like location. The presence of AdMob, Firebase, and GCM aligns with standard safety practices for apps in this category.
Each subscription will automatically renew 3 days before the expiration date for
the same time period. Subscriptions can be cancelled at any time before the renewal.
