Atomic Clock & Watch Accuracy

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

App info

Version :

2.0.9

Category :

Tools

Update :

July 24, 2025

Installs :

414,949

Developer :

Tomas Hubalek

Requires Android :

Android 5.0+

Content Rating :

Everyone

Get it on :

Download APK

App description

Android App Analysis and Review: Atomic Clock & Watch Accuracy, Developed by Tomas Hubalek. Listed in Tools Category. Current Version Is 2.0.9, Updated On 24/07/2025 . According to users reviews on Google Play: Atomic Clock & Watch Accuracy. Achieved Over 415 thousand Installs. Atomic Clock & Watch Accuracy Currently Has 17 thousand Reviews, Average Rating 4.8 Stars

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.

We are currently offering version 2.0.9. This is our latest, most optimized version. It is suitable for many different devices. Free download directly apk from the Google Play Store or other versions we're hosting. Moreover, you can download without registration and no login required.

We have more than 2000+ available devices for Samsung, Xiaomi, Huawei, Oppo, Vivo, Motorola, LG, Google, OnePlus, Sony, Tablet ... with so many options, it’s easy for you to choose games or software that fit your device.

It can come in handy if there are any country restrictions or any restrictions from the side of your device on the Google App Store.

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)

Rate and review on Google Play store

4.8

17,206 total

5 89.2

4 5.4

3 1.3

2 1.8

1 2.3

Total number of ratings

Total number of active users rated for: Atomic Clock & Watch Accuracy

Total number of installs (*estimated)

Estimation of total number of installs on Google Play, Approximated from number of ratings and install bounds achieved on Google Play.

Recent Comments

Anthony Haslam

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.

Daniel Schmidt

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.

What is it?!?

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

Spencer Romeu

I love this app but I keep noticing a concerning issue. The timing appears to be off. I am clocking my watch at -14s on a given day, and the math shows that from the current time of my watch compared to the time shown on the clock when the button is hit and it often looks to be off by 1 second. Idk if this is a result of milliseconds not showing in the calculation, but it doesn't feel like the tracking is always accurate. Hope this can be addressed / fixed!

Jon Doe

I use it to monitor the accuracy of watches on the wrist over days (so it includes the real-life weighted average of errors) as I adjust them. SUGGESTION: I have the paid version, where I can have quite an archive, so it would be nice to be able to attach a note to a measurement (and series), eg to describe the state of wind and whether an adjustment has been made. Thanks!

Josh Barnett

A fantastic app to have if you have a watch collection. It's worthwhile to pay for an upgrade to keep track of more than one watch in your collection. Has a very user friendly way of recording time measurements. One star off for being repeatedly nagged to rate the app. Feature requests: Ability to set custom NTP servers, plus set a preference to measure watch accuracy in seconds per month (seems to be the standard measure of watch accuracy).

Harry Grier

Great app. I live right on the border between Eastern and Central time. Depending on where I'm located on the farm and which cell tower I'm pinging, my phone will jump back and forth an hour. That makes for a confusing day. So we keep our phones permanently set to Central time. By not pinging a tower and getting constant time updates the phone drifts forward. Over the course of a couple of months it will be as much as 3 minutes ahead. I know this because of the Atomic Clock app.

A Google user

Enjoying the application, it's a great place to keep track of my watches, and their accuracy. It would be nice to have the ability to configure your own NTP server(s) as well as just choosing from the popular list. Moonphase would be a great addition, too for setting watches with that complication.