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Last updated on: 2026-05-23
Android Apps > Tools > Atomic Clock & Watch Accuracy
Atomic Clock & Watch Accuracy icon

Atomic Clock & Watch Accuracy

3.1.4
Tomas Hubalek
4.80
16,810 reviews
100,000+
Downloads
Free

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

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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 460 thousand times. In the last 30 days, the app was downloaded 1.8 thousand times.

User Ratings

Atomic Clock & Watch Accuracy is rated 4.80 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 31.30 MB. The latest version available is 3.1.4. The last update was on May 7, 2026.

Technical Requirements

Atomic Clock & Watch Accuracy requires Android 5.0+ or higher. The app has a content rating of Everyone. The app has been available on Google Play 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
--------------------------------
- Fixed bugs comming from beta testing (version 3.1.4)
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More data about Atomic Clock & Watch Accuracy

Price Free to download
Total downloads 460 thousand
Recent downloads 1.8 thousand
Rating 4.80 based on 17 thousand ratings
Ranking Not ranked
Version 3.1.4
APK size 31.3 MB
Number of libraries 17
Designed for Android 5.0+
Suitable for Everyone
Ads Contains ads

App Performance Report

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Atomic Clock & Watch Accuracy compared with similar apps

Keywords that only this app has

Adjust Track Wristwatch Watches Functionality Protocol Helpful Share Picture Shown Chart Paid Version

Common keywords of similar apps

Time Accuracy App Atomic Clock Ntp Servers Free Watch Exact Features Show

Keywords missing from this app

Digital Screen Display Analog Set Phone Widget Hour Battery Date Recent Lock Accurate World Wallpaper Night Alarm Flip Seconds Clocks Add Sync Color Huge Colors Utc Server Choose Background Easily Reference Customize Atomicclock Internet Options Face Device Full

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Google Play Rating history and histogram

15K
1.1K
230
45
410

Downloads over time

Atomic Clock & Watch Accuracy has been downloaded 460 thousand times. Over the past 30 days, it averaged 59 downloads per day.

Changelog of Atomic Clock & Watch Accuracy

  • May 7, 2026UpdateVersion 3.1.4
  • Dec 3, 2025UpdateVersion 2.6.0
  • Jul 24, 2025UpdateVersion 2.5.0
  • Mar 14, 2024UpdateVersion 2.0.9
  • Dec 5, 2023UpdateVersion 2.0.8
  • Nov 20, 2023UpdateVersion 2.0.5
  • Apr 5, 2023UpdateVersion 1.8.20
  • Nov 29, 2022UpdateVersion 1.8.13
  • Oct 19, 2022UpdateVersion 1.8.11
  • Oct 11, 2022UpdateVersion 1.8.9
  • Sep 15, 2022UpdateVersion 1.8.7
  • Jul 21, 2022UpdateVersion 1.8.5
  • Sep 8, 2021UpdateVersion 1.8.1
  • Jun 1, 2021UpdateVersion 1.8.0
  • May 24, 2021UpdateVersion 1.7.11
  • Oct 31, 2020UpdateVersion 1.6.10
  • Aug 10, 2020UpdateVersion 1.6.2
  • Jun 30, 2020UpdateVersion 1.5.10
  • Apr 10, 2020Installs100,000+ installs
  • Sep 25, 2019UpdateVersion 1.4.10
  • Sep 16, 2019Installs50,000+ installs
  • Jul 17, 2019UpdateVersion 1.4.3
  • Jan 22, 2019UpdateVersion 1.3.13
  • Jan 16, 2019UpdateVersion 1.3.10
  • Dec 29, 2018UpdateVersion 1.3.4
  • Nov 26, 2018Installs10,000+ installs
  • Sep 17, 2018Installs5,000+ installs
  • Aug 28, 2018UpdateVersion 1.2.0
  • Aug 6, 2018UpdateVersion 1.1.1
  • Aug 3, 2018UpdateVersion 1.1.0
  • Jul 17, 2018UpdateVersion 1.0.4
  • Jul 5, 2018UpdateVersion 1.0.1
  • Jul 4, 2018UpdateVersion 1.0.0
  • Jun 28, 2018New AppVersion 0.9.2 in TOOLS for Free
Show more Show less

Developer information for Tomas Hubalek

Tomas Hubalek

support@hubalek.net

Website

N/A

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Comments on Atomic Clock & Watch Accuracy for Android

★★★★★ Don C · May 21, 2026
Great little clock app especially when you need perfectly accurate time. I find it great at daylight savings to use as the master clock to set all the others against. The toggleable on-the-minute pips are excellent to provide an audible signal, so you can concentrate on the clock you're resetting in front of you, and use this app "hands free" Simple, clean interface, an excellent example of design done right.
★★★★★ 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
★★★★★ vaughn turner · May 11, 2026
Quite accurate app. I sometimes use it resetting clocks timing.
★★★★★ Francesco Memet · Jan 11, 2026
Excellent. I have a watch which has an accuracy of +/- 1 second every 100000 years. Linked to an atomic clock. It's good to check it, every now and then to see its keeping in sync. And this is just the app to use.
★☆☆☆☆ Ricci Leggio · Sep 23, 2025
Beware illusory accuracy. App has smooth interface and nice capture & record mechanism for tracking your watches' spd error over time. But even though the app shows a clock with very accurate "atomic" time synched correctly to internet, and even though it also correctly reports the error between atomic time and your phone's current clock time, it actually USES THE PHONE'S incorrect TIME TO MEASURE YOUR WATCH, NOT ATOMIC TIME. This is counterintuitive, super deceitful, not accurate at all.
★★☆☆☆ Ian Gourlay · Dec 11, 2025
I bought a copy of this fairly useful app, yet its current version after a few seconds of being launched, obscures the lower half of the screen with adverts. I suggest that you avoid its use, as the writer is clearly motivated to ransom its access and usability to repeat cash demands to restore app usability. There are other apps for monitoring watch accuracy (including an excellent simple telegrapher) and those have my recommendation over this one, now being uninstalled in disgust.

Google Play Rankings for Atomic Clock & Watch Accuracy

This app is not ranked

Technologies used by Atomic Clock & Watch Accuracy

Atomic Clock & Watch Accuracy is requesting 15 permissions and is using 18 libraries.

Permissions

Network communication
view network connections, full network access, Google Play billing service, Google Play license check, receive data from Internet
Your accounts
read Google service configuration
System tools
prevent phone from sleeping
Extra
android.permission.ACCESS_ADSERVICES_AD_ID, android.permission.ACCESS_ADSERVICES_ATTRIBUTION, android.permission.ACCESS_ADSERVICES_TOPICS, android.permission.FOREGROUND_SERVICE, android.permission.POST_NOTIFICATIONS, com.google.android.finsky.permission.BIND_GET_INSTALL_REFERRER_SERVICE, com.google.android.gms.permission.AD_ID, net.hubalek.android.apps.atomic_clock_watch_accuracy_tool.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION

Ad network libraries

AdMob Android Library IconAdMob Facebook Audience Network Android Library IconFacebook Audience Network

Social libraries

None found

Development tools

Android Jetpack core Android Library IconAndroid Jetpack core Android Architecture Components Android Library IconAndroid Architecture Components Android Jetpack VersionedParcelable Android Library IconAndroid Jetpack VersionedParcelable Firebase Android Library IconFirebase Android Jetpack Annotations Android Library IconAndroid Jetpack Annotations Android Jetpack Widgets Android Library IconAndroid Jetpack Widgets Android Jetpack AppCompat Android Library IconAndroid Jetpack AppCompat AndroidX Activity Android Library IconAndroidX Activity Android Activity Saved State Android Library IconAndroid Activity Saved State AndroidX Loader Android Library IconAndroidX Loader Android Jetpack Media Android Library IconAndroid Jetpack Media Google Cloud Messaging (GCM) Android Library IconGoogle Cloud Messaging (GCM) Kotlin Android Library IconKotlin Android Support VectorDrawable Android Library IconAndroid Support VectorDrawable Android WorkManager Android Library IconAndroid WorkManager
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ChronoLog Watch Accuracy Meter icon ChronoLog Watch Accuracy Meter
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