AtomicClock: NTP Time

Name: AtomicClock: NTP Time
Rating: 4.8 (5389 reviews)
Author: Timo Partl

Precision clock reference

Free · In‑App Purchases · Designed for iPad. Not verified for macOS.

5.4K Ratings
Age Rating

4+
Years
Category

Utilities
Developer

Timo Partl
Language

EN
+ 26 More
Size

14.2
MB

AtomicClock shows precise current time from NTP servers in a clear, customizable clock view. Use it as a reliable reference when setting watches, checking timestamps, timing important moments, or comparing local time with network time. Choose a public time server or add your own, then display the time in the format that fits your workflow. Features: • Precise current time from NTP servers • Analog clock display with fluid second hand • Multiple clock faces • Choose time servers or add a custom server • Local time and UTC views • 12-hour and 24-hour modes • Customizable time format • Acoustic ticking • Greenwich Time Signal AtomicClock is a practical reference clock for precise time checks. It displays network time for comparison and does not change your device’s system time.

Ratings & Reviews

4.8

out of 5

5.4K Ratings

Best Time App Ever!
08/24/2018

Irish Spike
I am a watch collector, main focus on Rolex as well as JLC, and several others I today picked up from my dealer a new steel Datejust, my focus is “functional “ rather than vintage or simply aesthetic hence my need for a good precise time app both to sync and also a diagnostic: time deviation. I’ve had several apps over the years 3 at least! After coming home from my Rolex dealer I wanted to get a solid sync for my fresh from box timepiece, both to set accurately but as a start point getting a feel of Calibre 3235 over next week. I looked at last app but it had some annoying issues. Hey I saw this and it was free! Downloaded SIMPLE TO custom set I gave it a more legible background for me put in wider hands and bolder hour markers. Easy peasy! I compared it to a G Shock that I recently calibrated from a good signal! It’s was SPOT ON AND I LOVE THE WAY YOU CAN CUSTOMIZE IT FOR YOUR USAGE! Having rambled !! Short summation it’s the easiest, set up, and can be as simple or give as much as one needs! THIS IS THE SINGLE BEST APP THIS WATCH GUY HAS EVER HAD THE PLEASURE TO HAVE USED! Thanks to the programmers this!
Best Time App Ever!
08/24/2018

Irish Spike

I am a watch collector, main focus on Rolex as well as JLC, and several others I today picked up from my dealer a new steel Datejust, my focus is “functional “ rather than vintage or simply aesthetic hence my need for a good precise time app both to sync and also a diagnostic: time deviation. I’ve had several apps over the years 3 at least! After coming home from my Rolex dealer I wanted to get a solid sync for my fresh from box timepiece, both to set accurately but as a start point getting a feel of Calibre 3235 over next week. I looked at last app but it had some annoying issues. Hey I saw this and it was free! Downloaded SIMPLE TO custom set I gave it a more legible background for me put in wider hands and bolder hour markers. Easy peasy! I compared it to a G Shock that I recently calibrated from a good signal! It’s was SPOT ON AND I LOVE THE WAY YOU CAN CUSTOMIZE IT FOR YOUR USAGE! Having rambled !! Short summation it’s the easiest, set up, and can be as simple or give as much as one needs! THIS IS THE SINGLE BEST APP THIS WATCH GUY HAS EVER HAD THE PLEASURE TO HAVE USED! Thanks to the programmers this!
A top clock app
10/20/2023

JJBarnone
I first started using this app in December of 2021 and use it multiple times a day on a daily basis. It helps to accurately set my timepieces and synchronize many gadgets that I work on. It’s great that you are able to set the clock face as simple or complex as you want, with an endless array of display and face settings. Thank you for making such a great app that’s easy to use and allows so many user options. All of the updates have been positive improvements - not that it’s lacking to begin with. This is how apps should be made.
A top clock app
10/20/2023

JJBarnone

I first started using this app in December of 2021 and use it multiple times a day on a daily basis. It helps to accurately set my timepieces and synchronize many gadgets that I work on. It’s great that you are able to set the clock face as simple or complex as you want, with an endless array of display and face settings. Thank you for making such a great app that’s easy to use and allows so many user options. All of the updates have been positive improvements - not that it’s lacking to begin with. This is how apps should be made.
Exactly what I need for accurate time
11/02/2025

stuart bruce becker
I use this app to adjust time when we change the time in November and March. And periodically when I notice a clock is not perfectly set. I like each clock set to the exact time. Nice features. I’ve noticed a few people mention ads. It’s an ad at top that you can easily adjust to a very small size. It’s usually the width of a pencil. And the developer should make some money for their time and effort. Great app. Many nice features I appreciate.

Developer Response
Thanks for taking the time to write such a detailed review. I’m happy to hear the app helps you keep your clocks perfectly synced and that the features are useful for your routine. I also appreciate your understanding about the ads and the kind words about the work behind the app.
Exactly what I need for accurate time
11/02/2025

stuart bruce becker

I use this app to adjust time when we change the time in November and March. And periodically when I notice a clock is not perfectly set. I like each clock set to the exact time. Nice features. I’ve noticed a few people mention ads. It’s an ad at top that you can easily adjust to a very small size. It’s usually the width of a pencil. And the developer should make some money for their time and effort. Great app. Many nice features I appreciate.
Developer Response 11/04/2025
Thanks for taking the time to write such a detailed review. I’m happy to hear the app helps you keep your clocks perfectly synced and that the features are useful for your routine. I also appreciate your understanding about the ads and the kind words about the work behind the app.
It works
03/25/2022

Si Cantwell
I’m kind of a time nerd. Most clocks, iPhone included, give time to the minute. If you’re setting another clock, you can’t get it right to the second unless you wait for another new minute to turn over. With Atomic Clock, you can anticipate the new minute and set digital or analog clocks to the precise second. I find myself using it more often than I thought I would. (BTW, the iPhone clock is precise judging by this app, which is reassuring.)
It works
03/25/2022

Si Cantwell

I’m kind of a time nerd. Most clocks, iPhone included, give time to the minute. If you’re setting another clock, you can’t get it right to the second unless you wait for another new minute to turn over. With Atomic Clock, you can anticipate the new minute and set digital or analog clocks to the precise second. I find myself using it more often than I thought I would. (BTW, the iPhone clock is precise judging by this app, which is reassuring.)

Improved existing and added new app translations Various smaller improvements

Version 3.6.19 May 4

Data Used to Track You

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- Identifiers
Data Linked to You

The following data may be collected and linked to your identity:
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- Usage Data
- Diagnostics
Data Not Linked to You

The following data may be collected but it is not linked to your identity:
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Supported Features
- VoiceOver
- Larger Text
- Dark Interface
- Differentiate Without Color Alone
- Sufficient Contrast
- Reduced Motion

Information

Seller: Timo Partl
Size: 14.2 MB
Category: Utilities
Compatibility: Requires iOS 15.0 or later.

iPhone
Requires iOS 15.0 or later.

iPad
Requires iPadOS 15.0 or later.

iPod touch
Requires iOS 15.0 or later.

Mac
Requires macOS 12.0 or later and a Mac with Apple M1 chip or later.
Languages: English and 26 more

English, Albanian, Arabic, Bulgarian, Czech, Danish, Dutch, French, German, Hebrew, Hungarian, Indonesian, Italian, Japanese, Korean, Lithuanian, Polish, Portuguese, Romanian, Russian, Simplified Chinese, Spanish, Swedish, Traditional Chinese, Turkish, Ukrainian, Vietnamese
Age Rating: 4+

4+

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Contains
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In-App Purchases: Yes

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