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Atomic Clock app for iPhone and iPad


4.6 ( 8256 ratings )
Utilities Reference
Developer: Awyse
2.99 USD
Current version: 4.7, last update: 7 years ago
First release : 28 Sep 2008
App size: 24.99 Mb

***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)

Pros and cons of Atomic Clock app for iPhone and iPad

Atomic Clock app good for

I have the older version that works until today without problems. I just bought the latest version, alas all I get is a black screen. I have an iPhone 5 and the latest IOS, v.9.1. I understand from the reviews that I am not the only one with this problem, so the developer either correct the problem or refund. Thank you. After the update of 2 days ago, it works well for me then I update my rating to 5.
Needs better configuration of which NTP servers or selecting offset methods, time adjusting history, frequency of updates, etc. App needs to be able to actually SET the time on your iPod!! Not a bad app, but not worth $5.00
The function is fantastic! Display is also sofisticated! Ive bought iPhone 3G in this April. Im satisfied with this small device with infinite possibility. In Japan, because iPhone user can not use automatic time adjustment with default setting, Ive been searching the way to adust internal clock of iPhone 3G. Finally, I found this application at apple store! With this application, we dont have to wear a wrist watch on earth!
11/26/15 It works on iPhone 6s+ w new ver Past post - Looks a good feature in description, but running this app shows only black screen and cant operate. Using iOS 9.0.2. Waiting for the fix . . . Please.
Di grafica accattivante, precisissimo (anche i centisecondi lol)..insomma una FIGATA, se si può dire, quasi un must Well done, but make it at max1.59€ And it consume lot of the battery.... BUT IS PERFECT if u can add personalizable colors it might be the optimal clock
I dont want to sound puerile, but: this application makes me happy. I have a bit of an OCD streak going and being able to check my clocks against the golden standard of worldwide horology assuaged my innermost demon. For a select few only, maybe, but perfect. Highly recommended.

Some bad moments

It worked two or three times, but now it crashes everytime it tries to connect to the server. Dont buy it!!!!!
On the 15 EUR pro version - pro because it has an alarm function - THE ALARM IS NOT WORKIG!!!! (on the iPhone 4) - At minimum it is a giant rip-off. DO NOT BUY THIS APP!!!
Was a great app, however I tested it on my phone and another iPhone 6 and crashes on startup.
No longer works on iOS 9.01 ? OS upgraded again, but still no luck with the app.
This, what was an excellent Atomic Clock has stopped working on iOS 9. Please update soon to get 5 star rating back
Doesnt start on iPhone 6 Plus... Very disappointing!!! The application was rock solid on all iPhone versions I had previously, including the 5s. Since the last update however it always crashes at startup and thus is completely useless. Hope this ha looked into by the company and makes the app as reliable as it used to be.

Usually Atomic Clock iOS app used & searched for

atomic clock, clock face, atomic clock pro, and other. So, download free Atomic Clock .ipa to run this nice iOS application on iPhone and iPad.