App Detail » Atomic Clock

What's New

This app has been updated by Apple to display the Apple Watch app icon.

-Updates for overall speed improvement (Swift 3)

App Description

***Ultra Precise, Ultra Accurate, Millisecond Atomic Clock Synced***

Includes FREE Apple Watch app to display accurate Second and Centisecond.

Your goal is to remain the most accurate mobile clock on mobile.

The Atomic Clock App displays Milliseconds, and accuracy of your device in millisecond.


V 4.7
down to 38 Millisecond accuracy,
PPS(Pulse Per Second) under a Millisecond 0.050 ms


Detailed features:

- Accuracy down to 1 Millisecond (Without subscription 5 centiseconds)

- Syncing to a network of time reference servers up to 16 in USA for better accuracy(Without subscription 1 server)

- Auto syncing continuously

- Display the device clock(With subscription)

- Show the time difference between the device and the official time(With subscription)

- Reference time for Asia/Europe/USA

- Jump between 2 time zone (Time Zone or local)

- Audio signal per second ON/OFF (PPS)

- 4 different alarm sounds

- Multi push alarms on multi time zones

- Multi time zones alarms


- Up to date Time zone table :
• official time zones
• military time
• aeronautical time
• astronomical time

from V 4.3:

Accuracy of the time is displayed in Milliseconds
A Pulse per Second timer is included
Multiple sources of reference time can be choose

Version 4.2 achieve to be precise at 2 millisecond in every set of 10 sec,(Pulse Per Second, PPS)

App Changes

• October 22, 2014 New version 4.0
• October 22, 2014 Price decrease: $19.99 -> $2.99
• July 26, 2015 New version 4.3
• November 28, 2015 New version 4.4
• December 05, 2015 New version 4.5
• July 05, 2016 New version 4.6
• December 01, 2016 New version 4.7