Comparison

Atomic Clock PRO vs iWatch

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Atomic Clock PRO

Get the most accurate time from an official atomic clock server. This app automatically detects your time zone and allows custom backgrounds. Easily switch between digital and analog clock displays with a swipe.

Highlights
  • Exact time from atomic clock
  • Automatic time zone recognition
  • Customizable background images
  • Digital and analog clock modes
  • Optional sound alerts
  • Color customization
Features
Read full description

Get accurate time on your iPhone and iPad by syncing with an official atomic clock time server. Download now for free! If you want exact time, a precise time reference, or an easy-to-read clock display, this app is designed for that. It automatically recognizes your time zone, lets you use one of your own photos as the background, and lets you switch between a digital display and a classic analog clock with a simple swipe. It is ideal as a personalized desk clock, a reliable travel companion, an everyday reference clock, or when you need exact time to set a mechanical watch accurately. Overview: - Accurate and precise time synced from an official atomic clock time server - Automatically recognizes your time zone and shows the current local time - Choose digital, analog, or combined analog and digital clock displays - Swipe to switch between clock displays - Resize the digital clock for a larger or smaller display - Includes time (hours, minutes, and seconds), date, and day of the week (optional) - Optional sound every second or every minute - Change clock and background colors - Use your own photos as background images - Choose atomic clock sync or your device's system clock - Option to keep the screen awake while the app is open - Works in portrait and landscape mode - For iPhone and iPad Helpful for: - A personalized desk clock at home or at work - Getting the correct local time while traveling - Setting a mechanical watch accurately - A clear reference clock when you want accurate, easy-to-read time PLEASE NOTE: You can switch between the analog and digital clock by swiping left or right across the clock. Disclaimer: Please note that whilst all reasonable care has been taken to make this application as accurate as possible we can not guarantee 100% accuracy. Standard Apple Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

About

iWatch

This digital watch app offers a large, easy-to-read display with accurate second updates, preventing time skipping. Customize themes and switch between 12/24 hour formats. Supports iPad split view.

Highlights
  • Accurate second display
  • Large, easy-to-read interface
  • Customizable theme colors
  • 12/24 hour format switching
  • iPad Split View and Slide Over support
Features
Read full description

iWatch is a simple and accurate digital watch with a largest display. You can freely change the theme color and the font. In digital clock apps, we often see apps that cause so-called "time skipping", in which the number of seconds that should be updated every second is rarely updated, or skips one second and advances to the next number of seconds. You can rest assured that the iWatch is expertly programmed to prevent such erroneous second display. The design is particularly simple and easy to read the time. Long tap “AM”, “PM” or “24h” on the screen to switch between 12-hour and 24-hour time. Long tap ⓘ (information button) to customize the theme color and the font. Supported Multi-Window on iPad. The developer assumes no responsibility for any loss or claims by third parties which may arise from the use of this app. Terms of Use: This application is provided under the Apple Standard End User License Agreement (EULA). https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

Atomic Clock PRO4 screens
iWatch4 screens

Verdict

The call

The clearest difference is review sentiment: Atomic Clock PRO at 73% against iWatch's 0%. Atomic Clock PRO also leads on ratings volume (10K vs 1). iWatch's advantage is rating (5.0 vs 4.7) and update cadence (monthly vs every 3 months). On price, ads, in-app purchases and monetization model there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Atomic Clock PRO sells 2 in-app purchases, starting at $1.99 per month and iWatch sells 3 in-app purchases, starting at $0.99 per month. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

iWatch holds the better App Store score, 5.0 against 4.7. That said, the two scores are not equally well evidenced: Atomic Clock PRO has 10K ratings behind it against 1, so its average is the more settled of the two. Written reviews complicate that: 73% of Atomic Clock PRO's written reviews are positive against 0% of iWatch's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

Atomic Clock PRO ships an update every 3 months, iWatch monthly. The most recent releases landed on October 28, 2026 and October 26, 2026 respectively.

Scorecard4 real differences · 6 level
Atomic Clock PRO versus iWatch: the parameters behind the verdict, then further details
ParameterAtomic Clock PROiWatch
PriceFreeFree
Rating4.7 (10K ratings)5.0 (1 ratings) — better
Positive reviews73.0% of reviews — better0.0% of reviews
Number of ratings10K — better1
Update frequencyEvery 3 monthsMonthly — better
AdsYesYes
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.615.0 — better
Further details — not scored
Size6 MB9 MB
Age rating4+4+
DeveloperBrachmann Online Marketing GmbH & Co. KGTakao Ichimura

Customer experience

Atomic Clock PRO

All ratings10,111 ratings
Positive92.3%
Neutral3.5%
Negative4.2%
Written reviews422 reviews
Positive73.0%
Neutral5.9%
Negative21.1%

iWatch

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive0.0%
Neutral0.0%
Negative100.0%

Bugs and requests

Atomic Clock PRO

Reported bugs

3 issues
  • Second hand occasionally runs in reverse
  • Digital clock display cuts off on some devices
  • Inconsistent behavior when switching between clock types

Requested features

3 requests
  • Customizable clock face options
  • Ability to set widget on home screen
  • Sync with system clock to automatically update time

iWatch

Not enough reviews yet to summarise bugs or requests.

In-app purchases

2 purchases

Atomic Clock PRO

Subscriptions1
  • Premium$1.991 Month
One-time1
  • Remove Ads$5.99
3 purchases

iWatch

Subscriptions2
  • Monthly Plan$0.991 Month
  • Yearly Plan$2.991 Year
One-time1
  • Remove Ads and Add Features$2.99

Questions

Is Atomic Clock PRO free?
Atomic Clock PRO is free to download, with in-app purchases available.
Is iWatch free?
iWatch is free to download, with in-app purchases available.
Which has better reviews, Atomic Clock PRO or iWatch?
iWatch is rated higher. Atomic Clock PRO averages 4.7 out of 5 from 10K ratings, while iWatch averages 5.0 from 1 ratings.
Do Atomic Clock PRO or iWatch have ads?
Both Atomic Clock PRO and iWatch show ads.
Which is updated more often, Atomic Clock PRO or iWatch?
Atomic Clock PRO ships an update every 3 months, and iWatch monthly. Most recently, Atomic Clock PRO was updated on October 28, 2026 and iWatch on October 26, 2026.

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