Comparison

Atomic Clock PRO vs Five Bells

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

Five Bells

This app replicates the traditional ship's bell system for marking time and watch changes. Users can configure bell sequences, set hourly chimes, and schedule quiet times. It also offers additional information for sailors.

Highlights
  • Traditional ship's bell simulation
  • Configurable bell sequences
  • Hourly single bell option
  • Scheduled quiet time
  • Maritime information for sailors
Features
Read full description

For sailors or anyone interested in maritime tradition. The ship’s bell has traditionally been used to mark the passage of time and the changeover of watches aboard ships. Five Bells aims to replicate this tradition on your iPhone®. Bells can be configured to sound a traditional or simplified sequence. Alternatively, a single bell can be struck every hour. A scheduled quiet-time can be enabled to prevent bells from sounding during a scheduled period. Additional information relevant to sailors is also provided.

Screenshots

Atomic Clock PRO4 screens
Five Bells4 screens

Verdict

The call

The clearest difference is ads: Five Bells at none against Atomic Clock PRO's shown. Five Bells also leads on update cadence (every 2 months vs every 3 months). Atomic Clock PRO's advantage is ratings volume (10K vs 198). On price, rating, review sentiment 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. Atomic Clock PRO sells 2 in-app purchases, starting at $1.99 per month and Five Bells sells 3 one-off in-app purchases. 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 — 4.7 for Atomic Clock PRO against 4.7 for Five Bells. That said, the two scores are not equally well evidenced: Atomic Clock PRO has 10K ratings behind it against 198, 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 79% of Five Bells's.

UpkeepUpdate frequency

Atomic Clock PRO ships an update every 3 months, Five Bells every 2 months. The most recent releases landed on October 13, 2026 and October 1, 2026 respectively.

Scorecard3 real differences · 7 level
Atomic Clock PRO versus Five Bells: the parameters behind the verdict, then further details
ParameterAtomic Clock PROFive Bells
PriceFreeFree
Rating4.7 (10K ratings)4.7 (198 ratings) — better
Positive reviews72.9% of reviews79.5% of reviews — better
Number of ratings10K — better198
Update frequencyEvery 3 monthsEvery 2 months — better
AdsYesNo — better
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 MB36 MB
Age rating4+4+
DeveloperBrachmann Online Marketing GmbH & Co. KGMark Gould

Customer experience

Atomic Clock PRO

All ratings10,111 ratings
Positive92.3%
Neutral3.5%
Negative4.2%
Written reviews421 reviews
Positive72.9%
Neutral5.9%
Negative21.1%

Five Bells

All ratings198 ratings
Positive94.9%
Neutral2.0%
Negative3.0%
Written reviews39 reviews
Positive79.5%
Neutral7.7%
Negative12.8%

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

Five Bells

From 198 App Store ratings

What we love

  • 🔔 Great bell sounds
  • 👍 Exactly what users wanted
  • 💡 Useful for time tracking
  • 💰 Free with donation option
  • 🌙 Quiet hours feature appreciated

Room to improve

  • 🐛 Quiet time feature doesn't work
  • ⏰ Time incorrect/chiming late
  • 🔇 Silence function doesn't work
  • 🔊 Too loud, needs volume control
  • 🔔 Half-hour bell can be annoying

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

Five Bells

Reported bugs

9 issues
  • Quiet time feature doesn't work
  • Time incorrect, chiming late
  • Silence function doesn't work
  • App doesn't work on Apple Watch, only one ding
  • Number of bells doubled on iPad compared to iPhone
Show 4 more
  • App strikes bells when it wants, not always when required
  • Bells stopped working after iOS 17 upgrade
  • App doubles strikes (e.g., 16 bells at noon)
  • Developer webpage link goes to an error

Requested features

6 requests
  • Nicer clock interface
  • Volume control or loud/medium/quiet switch
  • Option to leave out half-hour bell
  • Ability to have app on Apple Watch
  • Choice of bell sounds
Show 1 more
  • Fix Apple Watch integration

In-app purchases

2 purchases

Atomic Clock PRO

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

Five Bells

One-time3
  • Regular Coffee$1.99
  • Large Coffee$2.99
  • Lunch$4.99

Questions

Is Atomic Clock PRO free?
Atomic Clock PRO is free to download, with in-app purchases available.
Is Five Bells free?
Five Bells is free to download, with in-app purchases available.
Which has better reviews, Atomic Clock PRO or Five Bells?
Five Bells is rated higher. Atomic Clock PRO averages 4.7 out of 5 from 10K ratings, while Five Bells averages 4.7 from 198 ratings.
Do Atomic Clock PRO or Five Bells have ads?
Atomic Clock PRO shows ads; Five Bells does not.
Which is updated more often, Atomic Clock PRO or Five Bells?
Atomic Clock PRO ships an update every 3 months, and Five Bells every 2 months. Most recently, Atomic Clock PRO was updated on October 13, 2026 and Five Bells on October 1, 2026.

Other comparisons