Comparison

Atomic Clock PRO vs Clock

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

Clock

This app displays the time with a minimalistic design, utilizing the full screen. It offers extensive customization for time format, including 12/24 hour, leading zeros, and seconds precision. Screen brightness can be adjusted by swiping, and screen dimming can be prevented.

Highlights
  • Full-screen display
  • Customizable time format (12/24hr, seconds)
  • Adjustable screen brightness
  • Prevent screen dimming
  • Minimalistic design
Features
Read full description

A simple app that displays the time beautifully and in the most minimalistic way possible while using the whole size of your screen. The time format is completely customizable! You can choose to: – use the 24 hours or 12 hours format with am/pm – show a leading zero in front of single-digit hours – show seconds or only hours and minutes – even display tenths, hundredths and thousandths of a second! You can also optionally adjust the brightness of the clock by swiping on the screen and configure whether you want the app to prevent your screen from automatically turning off!

Screenshots

Atomic Clock PRO4 screens
Clock4 screens

Verdict

The call

The clearest difference is in-app purchases: Clock at none against Atomic Clock PRO's 2. Clock also leads on ads (none vs shown) and review sentiment (84% vs 73%). Atomic Clock PRO's advantage is ratings volume (10K vs 152) and rating (4.7 vs 4.4). On price 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

Both are free to download. Atomic Clock PRO sells 2 in-app purchases, starting at $1.99 per month. Clock asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Atomic Clock PRO holds the better App Store score, 4.7 against 4.4. That said, the two scores are not equally well evidenced: Atomic Clock PRO has 10K ratings behind it against 152, 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 84% of Clock'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, Clock every 12 months. The most recent releases landed on September 25, 2026 and September 26, 2026 respectively.

Scorecard8 real differences · 2 level
Atomic Clock PRO versus Clock: the parameters behind the verdict, then further details
ParameterAtomic Clock PROClock
PriceFreeFree
Rating4.7 (10K ratings) — better4.4 (152 ratings)
Positive reviews72.7% of reviews84.5% of reviews — better
Number of ratings10K — better152
Update frequencyEvery 3 months — betterEvery 12 months
AdsYesNo — better
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFree — better
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.612.0 — better
Further details — not scored
Size6 MB2 MB
Age rating4+4+
DeveloperBrachmann Online Marketing GmbH & Co. KGMax-Joseph Krempl

Customer experience

Atomic Clock PRO

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

Clock

All ratings152 ratings
Positive84.2%
Neutral3.3%
Negative12.5%
Written reviews116 reviews
Positive84.5%
Neutral3.4%
Negative12.1%

User reviews

Atomic Clock PRO

From 10K App Store ratings

What we love

  • ⭐ Accurate time display
  • 📟 Useful for timing events
  • 🕰️ Helpful for setting other clocks
  • 🔍 Large, easy-to-read clock face

Room to improve

  • 💸 Subscription model for ad-free version
  • 📢 Excessive advertisements
  • 🔍 Small font for seconds display
  • 🔀 Difficulty in displaying both analog and digital clocks simultaneously

Clock

From 152 App Store ratings

What we love

  • 👍 Simple, minimalist design focused solely on displaying time
  • 🆓 Completely free with no ads or in-app purchases
  • 🔒 No data collection or tracking
  • 🔆 Adjustable brightness/dimming feature for nighttime use
  • ⏱️ Displays seconds and milliseconds options

Room to improve

  • 🐛 Settings not persisting (12/24 hour format reverts)
  • 🔋 High battery consumption reported by some users
  • 📱 No landscape mode option (conflicting reports)
  • 🔆 Brightness controls remain visible when dimmed
  • 🐛 Occasional font weight fluctuations

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

Clock

Reported bugs

12 issues
  • 12/24 hour format setting not saving properly
  • Widget fails to display current time
  • Siri cannot distinguish between this app and Apple's Clock
  • App not appearing in Shortcuts app list
  • Screen burn-in after extended use
Show 7 more
  • Font weight changing unexpectedly during use
  • AM/PM indicator appearing without user action
  • App freezing and blocking phone access
  • Camera turning on automatically after download
  • Excessive battery drain on some devices
  • Display remaining bright when dimming is enabled
  • Wrong time display with no way to set correct time

Requested features

12 requests
  • Date display option (most frequently requested)
  • Bold/thicker font option for better readability
  • Color customization (especially red for night vision preservation)
  • Widget support with live time display
  • Battery percentage indicator
Show 7 more
  • Timer functionality
  • Donation/tip button for supporting developer
  • Dark red color option to reduce room lighting impact
  • AM/PM positioning adjustment (above, below, or between digits)
  • Screen burn-in prevention feature
  • Settings toggle visibility improvement
  • Ability to replace system status bar clock

In-app purchases

2 purchases

Atomic Clock PRO

Subscriptions1
  • Premium$1.991 Month
One-time1
  • Remove Ads$5.99
None

Clock

No in-app purchases

Questions

Is Atomic Clock PRO free?
Atomic Clock PRO is free to download, with in-app purchases available.
Is Clock free?
Clock is free to download, with no in-app purchases.
Which has better reviews, Atomic Clock PRO or Clock?
Atomic Clock PRO is rated higher. Atomic Clock PRO averages 4.7 out of 5 from 10K ratings, while Clock averages 4.4 from 152 ratings.
Do Atomic Clock PRO or Clock have ads?
Atomic Clock PRO shows ads; Clock does not.
Which is updated more often, Atomic Clock PRO or Clock?
Atomic Clock PRO ships an update every 3 months, and Clock every 12 months. Most recently, Atomic Clock PRO was updated on September 25, 2026 and Clock on September 26, 2026.

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