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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Alternative downloads for the Atomic Clock & Watch Accuracy app

Atomic Clock & Watch Accuracy compared with similar apps

Google Play Rating history and histogram

15K

1.1K

230

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

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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

Facebook Audience Network

Social libraries

None found

Development tools

Android Jetpack core

Android Architecture Components

Android Jetpack VersionedParcelable Firebase Android Library Icon

Firebase

Android Jetpack Annotations Android Jetpack Widgets Android Library Icon

Android Jetpack Widgets Android Jetpack AppCompat Android Library Icon

Android Jetpack AppCompat AndroidX Activity Android Library Icon

AndroidX Activity Android Activity Saved State Android Library Icon

Android Activity Saved State AndroidX Loader Android Library Icon

AndroidX Loader Android Jetpack Media Android Library Icon

Android Jetpack Media Google Cloud Messaging (GCM) Android Library Icon

Google Cloud Messaging (GCM) Kotlin Android Library Icon

Kotlin

Android Support VectorDrawable Android WorkManager Android Library Icon

Android WorkManager

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