Atomic Clock & Watch Accuracy

Contains adsIn-app purchases
4.9
17.1K reviews
100K+
Downloads
Content rating
Rated for 3+
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About this app

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.
Updated on
Oct 15, 2024

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
This app may share these data types with third parties
App activity, App info and performance, and Device or other IDs
This app may collect these data types
App activity, App info and performance, and Device or other IDs
Data is encrypted in transit
Data can’t be deleted

Ratings and reviews

4.9
16.2K reviews
Anthony Haslam
June 3, 2025
Works well to track watch accuracy. However, this developer clearly doesn't respect their users. After paying a reasonable amount to log multiple watches, I'm not only bombarded with trashy adverts but constantly asked to confirm my data preferences. Here, there's the default option to allow all, else there's hundreds to review and disable, many clearly without legitimate interest. If there's an option to allow all, there should be one to deny all, or one should manually opt in, rather than out.
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Tomas Hubalek
June 9, 2025
Thank you for your feedback. We apologize for any inconvenience caused by the ads and data preferences prompts. We will take your suggestions into consideration for future updates to improve the user experience.
Daniel Schmidt
May 30, 2025
Edit: Changed to 5 stars since the developer corrected my misunderstanding of how the app works. Now it is pretty much perfect!! Thanks~ Old Review: The app does everything I could want EXCEPT one critical flaw... you cannot edit measurements to remove or update an incorrect log. If you accidentally enter something wrong or realize you logged under the wrong watch, you lose your entire progress and have to delete the watch and start from scratch. even if you've been tracking it for days/weeks.
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Tomas Hubalek
May 30, 2025
Thank you for your feedback. You can remove wrong entry by swiping left of that entry. Trashcan icon appears and you can delete the record.
What is it?!?
April 25, 2025
This truly is an amazing app. Simple, yet exactly what you need. I use it with confidence when setting any of my clocks or watches (even in my car). Altho I don't really use the accuracy logging feature that much anymore, it's excellent when trying to figure out the quirks of a watch over time, and perhaps adjust it long term. This app has been a trusted companion for a long time, and it will continue to be for as long as I can imagine
1 person found this review helpful
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What’s new

Release notes for version 2.0.x
--------------------------------
- Collapsible ads can be displayed on main screen only since now. Will not be shown in nested screens. (version 2.0.7)
- Changed ads layout (version 2.0.6)
- Fixed logout related crash (version 2.0.5)
- Fixed rare crashes (version 2.0.4)
- Fixed another login issue related to backups (version 2.0.3)
- Fixed login issue related to backups (version 2.0.2)
- Upgraded to latest version of Google's payment solution (version 2.0.0)