Comparison

Atomic Clock PRO vs AClock

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

AClock

This minimalist clock app offers a customizable full-screen display with options for flip or classic digital styles. It includes productivity tools like a stopwatch, countdown, and Pomodoro timer, along with personalized features such as countdowns to important dates and customizable slogans. The app is designed for extreme power saving and eye protection with a night mode.

Highlights
  • Flip and classic digital clock styles
  • Stopwatch, countdown, and Pomodoro timer
  • Countdown to dates and anniversaries
  • Customizable colors, fonts, and slogans
  • Night mode for eye protection
  • 12/24 hour system support
Features
Read full description

AClock is a fully functional, minimalist design, extreme power saving, lightweight and efficient clock app. special function: 1. Switch between page turning clock and classic digital clock as you like 2. Built-in convenient stopwatch, countdown, Pomodoro 3. Display of countdown days and anniversaries to create your own personalized clock 4. Customize the font color and size, and customize the background color 5. Customize your inspirational slogan to encourage your dedicated self~ 6. Date, second, motivational slogan, custom display 7. Support night mode, more eye protection 8. Support 12-hour system and 24-hour system 9. Extremely power saving, all-round optimization, escort the power 10. Countdown to the exam

Screenshots

Atomic Clock PRO4 screens
AClock4 screens

Verdict

The call

The clearest difference is price: Atomic Clock PRO at Free against AClock's $0.99. Atomic Clock PRO also leads on ratings volume (10K vs 10). AClock's advantage is in-app purchases (none vs 2) and ads (none vs shown). On rating and device support 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

Atomic Clock PRO is free to download; AClock costs $0.99 up front. Atomic Clock PRO sells 2 in-app purchases, starting at $1.99 per month. AClock asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 4.7 for Atomic Clock PRO against 4.7 for AClock. That said, the two scores are not equally well evidenced: Atomic Clock PRO has 10K ratings behind it against 10, so its average is the more settled of the two. Written reviews are what separate them: 73% of Atomic Clock PRO's written reviews are positive against 100% of AClock's.

UpkeepUpdate frequency

Atomic Clock PRO ships an update every 3 months, AClock fortnightly. The most recent releases landed on September 25, 2026 and September 21, 2026 respectively.

Scorecard8 real differences · 2 level
Atomic Clock PRO versus AClock: the parameters behind the verdict, then further details
ParameterAtomic Clock PROAClock
PriceFree — better$0.99
Rating4.7 (10K ratings)4.7 (10 ratings)
Positive reviews72.7% of reviews100.0% of reviews — better
Number of ratings10K — better10
Update frequencyEvery 3 monthsFortnightly — better
AdsYesNo — better
In-app purchasesYesNo — better
MonetizationFree with in-app purchases — betterPaid
DevicesiPhone, iPad, iPodiPhone, iPad, iPod, Mac — better
Requires iOS15.611.0 — better
Further details — not scored
Size6 MB10 MB
Age rating4+4+
DeveloperBrachmann Online Marketing GmbH & Co. KGZhengzhou Sibo Intelligent Technology Co., Ltd.

Customer experience

Atomic Clock PRO

All ratings10,111 ratings
Positive92.3%
Neutral3.5%
Negative4.2%
Written reviews421 reviews
Positive72.7%
Neutral6.2%
Negative21.1%

AClock

All ratings10 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews24 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

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

AClock

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
None

AClock

No in-app purchases

Questions

Is Atomic Clock PRO free?
Atomic Clock PRO is free to download, with in-app purchases available.
Is AClock free?
AClock costs $0.99, with no in-app purchases.
Which has better reviews, Atomic Clock PRO or AClock?
Atomic Clock PRO and AClock are both rated 4.7 out of 5 on the App Store, from 10K and 10 ratings respectively.
Do Atomic Clock PRO or AClock have ads?
Atomic Clock PRO shows ads; AClock does not.
Which is updated more often, Atomic Clock PRO or AClock?
Atomic Clock PRO ships an update every 3 months, and AClock fortnightly. Most recently, Atomic Clock PRO was updated on September 25, 2026 and AClock on September 21, 2026.

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