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Android Apps > Tools > Atomic Clock & Watch Accuracy
Atomic Clock & Watch Accuracy icon

Atomic Clock & Watch Accuracy

3.1.11
Tomas Hubalek
4.82
17,086 reviews
100,000+
Downloads
Free

Adjust your watch with Atomic (NTP) time clock and measure its accuracy

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Screenshots by Tomas Hubalek, from the Google Play listing
View on Google Play

Summary

Atomic Clock & Watch Accuracy uses NTP time to show exact moments and enables wristwatch accuracy tracking with shareable charts.

Pros & Cons

  • NTp-based time accuracy from trusted servers for precise clock setting
  • Dedicated watch-accuracy tracking with charts and statistics
  • Shareable charts and CSV export for collaborators
  • Free core features with optional premium upgrade
  • Limited display customization and widgets not mentioned
  • Lacks explicit digital/analog display options or on-device timers
  • No indication of multiple clocks or color themes

About Atomic Clock & Watch Accuracy

Atomic Clock & Watch Accuracy is a tools app developed by Tomas Hubalek.

Install Statistics

Atomic Clock & Watch Accuracy has been installed 480 thousand times. In the last 30 days, the app was installed 2.9 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 freely available from Google Play. The app 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.

Atomic Clock & Watch Accuracy is made and published by Tomas Hubalek. AppBrain is an independent app data site and isn't affiliated with Tomas Hubalek. The app name, icon, screenshots and description belong to Tomas Hubalek and are shown as published on Google Play.

Description by Tomas Hubalek (from Google Play)
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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Google Play Rating history and histogram

15K
1K
230
45
360

Installs over time

Atomic Clock & Watch Accuracy has been installed 480 thousand times. Over the past 30 days, it averaged 95 installs per day.

Changelog of Atomic Clock & Watch Accuracy

Show changelog

Developer information for Tomas Hubalek

Tomas Hubalek

support@hubalek.net

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Comments on Atomic Clock & Watch Accuracy for Android

★★★★★ 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.
★★★★★ David Lynn · Oct 30, 2026
Very nice app for the watch enthusiast. Also, a nice way to get to the time from an atomic clock in one tap.
★★★★★ Christopher Juckins · Jul 10, 2026
Easy to use and very helpful, I love knowing the exact time when I need to set my clocks at home. Thank you for making this app available.
★★★★★ 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
★★☆☆☆ ImarSchmo · Nov 2, 2026
2NOV26 Problems‽ I'm using Samsung S24 Ultra, and I'm having issues with the BBC Greenwich Time Signal (aka the pips). It often works wrongly, producing too few pips and sometimes with pips displaced by one second or so. I notice this when I was changing from daylight savings time. Occasionally the issue corrects itself after a few minutes. 17AUG24 Originally purchased. It seemed to work OK
★☆☆☆☆ 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
Subscribe to see full permission and library details
Trust & Safety: This app requests Internet access, network state, wake lock, and a foreground service for time synchronization, along with push notifications and license verification. It also integrates with ad networks and billing for premium features. Based on the provided permissions, this appears to be a standard, ad-supported free app with an optional paid upgrade; no sensitive data handling is indicated by the data provided.
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