Comparison

Alarm Clock' vs Atomic Clock PRO

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

Head to head
About

Alarm Clock'

Wake up with customizable alarms, music, and sounds. Features include a sleep timer, adjustable nightstand display, and an instant flashlight. Enjoy a premium ad-free experience with a subscription.

Highlights
  • Unlimited alarms with music or sounds
  • Customizable nightstand display colors
  • Large snooze buttons
  • Sleep timer for music playlists
  • Local weather information
  • Instant flashlight via shake gesture
Features
Read full description

Wake up your way, every day! Set unlimited alarms, choose for Music or Alarm Sounds, and set up your Snooze preferences. Customize your Nightstand by adjusting it to the color you’d like for your clock display. Use the Sleep Timer to fall asleep to your favorite music playlist. Free in Alarm Clock • Unlimited Alarms: Apple Music or Alarm Sounds • Customize Nightstand display colors • BIG Snooze Buttons • Sleep Timer • Local Weather Information • Instant Flashlight - shake the device • Full watchOS 2 support • Screen Saver - for devices with OLED display Enjoy Alarm Clock Ad-Free! Go Premium with the yearly subscription and enjoy an ad-free experience. • 3-Day Free Trial • Ad-Free • All Themes • Premium Customer Support The subscription is charged to your Apple ID account at confirmation of purchase. Subscription is for a period of one year and automatically renews unless auto-renew is turned off at least 24-hours before the end of the current period. Your account will be charged for renewal within 24-hours prior to the end of the current period, and identify the cost of the renewal. Subscriptions may be managed by you and auto-renewal may be turned off by going to your Account Settings after purchase. The cancellation will take effect the day after the last day of the current subscription period, and you will be downgraded to the free service. Terms & Conditions: https://impalastudios.com/terms
Privacy Policy: https://impalastudios.com/privacy >> Have any questions? Please check out if the answers are available in the Frequently Asked Questions in the app Settings. Have suggestions or are unable to find the answers to your questions? Our support team is ready and happy to help at support@impalastudios.com! ENJOY…THE TIME IS RIGHT!

About

Atomic Clock PRO

This app provides highly accurate time by syncing with official atomic clock servers. Customize your display with digital or analog views, personal backgrounds, and adjustable sizes. It's perfect for precise timekeeping, travel, or as a personalized desk clock.

Highlights
  • Atomic clock time synchronization
  • Digital and analog display options
  • Customizable backgrounds
  • Adjustable clock size
  • Automatic time zone recognition
  • Screen always on option
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/

Screenshots

Alarm Clock'4 screens
Atomic Clock PRO4 screens

Verdict

The call

The clearest difference is update cadence: Alarm Clock' at every 3 weeks against Atomic Clock PRO's every 4 months. Alarm Clock' also leads on ratings volume (36K vs 10K). Atomic Clock PRO's advantage is review sentiment (73% vs 64%) and iOS requirement (15.6 vs 18.0). On price, rating, ads and in-app purchases 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. Alarm Clock' sells 5 in-app purchases, starting at $4.99 per 7 days and Atomic Clock PRO sells 2 in-app purchases, starting at $1.99 per month. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 4.6 for Alarm Clock' against 4.7 for Atomic Clock PRO. Both are backed by a comparable volume of ratings — 36K and 10K respectively. Written reviews are what separate them: 64% of Alarm Clock''s written reviews are positive against 73% of Atomic Clock PRO's.

UpkeepUpdate frequency

Alarm Clock' ships an update every 3 weeks, Atomic Clock PRO every 4 months. Both last shipped on November 10, 2026.

Scorecard4 real differences · 6 level
Alarm Clock' versus Atomic Clock PRO: the parameters behind the verdict, then further details
ParameterAlarm Clock'Atomic Clock PRO
PriceFreeFree
Rating4.6 (36K ratings)4.7 (10K ratings) — better
Positive reviews64.1% of reviews72.9% of reviews — better
Number of ratings36K — better10K
Update frequencyEvery 3 weeks — betterEvery 4 months
AdsYesYes
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS18.015.6 — better
Further details — not scored
Size259 MB6 MB
Age rating4+4+
DeveloperImpala Studios B.V.Brachmann Online Marketing GmbH & Co. KG

Customer experience

Alarm Clock'

All ratings35,848 ratings
Positive89.3%
Neutral4.7%
Negative6.0%
Written reviews1,579 reviews
Positive64.1%
Neutral12.5%
Negative23.4%

Atomic Clock PRO

All ratings10,230 ratings
Positive92.3%
Neutral3.5%
Negative4.2%
Written reviews425 reviews
Positive72.9%
Neutral5.9%
Negative21.2%

User reviews

Alarm Clock'

From 36K App Store ratings

What we love

  • 🚀 Best alarm app ever
  • 👍 Customizable alarms and music
  • 🔒 Reliable and consistent
  • 💡 Useful features like flashlight

Room to improve

  • 🐛 Alarm not going off
  • 🔋 Battery drain issues
  • 📢 Intrusive and bright ads
  • 🔒 Unreliable alarm function

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

Bugs and requests

Alarm Clock'

Reported bugs

4 issues
  • Alarm freezing or crashing
  • Clock display disappearing
  • Snooze button not working
  • Compatibility issues with iOS updates

Requested features

4 requests
  • More alarm sound options
  • Ability to upload own music
  • Persistent clock display at night
  • Exclude from Screen Time

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

In-app purchases

5 purchases

Alarm Clock'

Subscriptions4
  • Premium Weekly$4.997 Days
  • Premium Yearly Promo$17.491 Year
  • Premium Yearly$34.991 Year
Show 1 more
  • Premium Yearly3 Days trial$34.991 Year
One-time1
  • Upgrade to full version$34.99
2 purchases

Atomic Clock PRO

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

Questions

Is Alarm Clock' free?
Alarm Clock' is free to download, with in-app purchases available.
Is Atomic Clock PRO free?
Atomic Clock PRO is free to download, with in-app purchases available.
Which has better reviews, Alarm Clock' or Atomic Clock PRO?
Atomic Clock PRO is rated higher. Alarm Clock' averages 4.6 out of 5 from 36K ratings, while Atomic Clock PRO averages 4.7 from 10K ratings.
Do Alarm Clock' or Atomic Clock PRO have ads?
Both Alarm Clock' and Atomic Clock PRO show ads.
Which is updated more often, Alarm Clock' or Atomic Clock PRO?
Alarm Clock' ships an update every 3 weeks, and Atomic Clock PRO every 4 months. Most recently, Alarm Clock' was updated on November 10, 2026 and Atomic Clock PRO on November 10, 2026.

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