Atomic Clock & Watch Accuracy v2.6.0

Tomas Hubalek

Contains ads • In-app purchases

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About this app

Developer Description

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

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.

What's New

Release notes for version 2.6.x
--------------------------------
- Polished look of UI (version 2.6.0)
- Easier selection of NTP server (version 2.6.0)
- Made compatible with latest Android SDK (version 2.6.0)

In-app purchases

$3.49 - $9.99 per item

Version Information

Version: 2.6.0
Downloads: 100K+
Updated on: Dec 17, 2025
Released: Jul 2, 2018
Requires: Android 6.0

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Atomic Clock & Watch Accuracy users say on Google Play

★★★★★

Nick Wilcox

Purchased the premium which was a refreshing one time purchase versus a subscription so I could track multiple watches. Does exactly what I need it to do.

★★★★

Mats12 East

Overall does the job.

★★

Ian Gourlay

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 timegrapher) and those have my recommendation over this one, now being uninstalled in disgust.

★

Ricci Leggio

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 counter intuitive, super deceitful, not accurate at all.