Comparison

Sun Clock App vs AtomicClock

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

Head to head
About

Sun Clock App

This utility app displays the current time and the sun's position for your location. It shows solar time, sunrise, and sunset, with options to toggle seconds and 12/24-hour formats. The app automatically updates your location and can keep your device awake for continuous display.

Highlights
  • Shows solar time
  • Displays sunrise and sunset times
  • Toggle seconds display
  • 12/24 hour format option
  • Automatic location updates
  • Keeps device awake
Features
Read full description

This clock shows the time and the position of the sun for your current location. The blue line shows how much time of the day is already gone. Features: - shows the solar time, sunrise and sunset times - toggle the display of the seconds - toggle between 12 and 24 hours - the location is automatically updated when you move - keeps the device awake, so it can be used as a real clock

About

AtomicClock

This app displays the exact current time synchronized with NTP servers, offering a customizable clock view for precise time checks. It's ideal for setting watches, verifying timestamps, or comparing local and network time.

Highlights
  • Precise time from NTP servers
  • Customizable clock faces
  • Select or add time servers
  • Local and UTC views
  • 12/24 hour modes
  • Customizable time format
  • Acoustic ticking
Features
Read full description

Check precise NTP reference time at a glance. AtomicClock helps you set watches, wall clocks, cameras, and other devices, compare local time with UTC, and follow moments when every second matters. Clear analog and digital time AtomicClock displays current time from NTP servers that reference atomic clocks. Choose a predefined server or add your own, then view local or UTC time in a clean analog or digital clock. Customize your reference clock • Switch between 12-hour and 24-hour time • Customize the time format • Choose from multiple clock faces and hands • Use a smooth, fluid second hand • Add acoustic ticking or the Greenwich Time Signal • Tap the screen to hide information and controls, freeze the display, or mute ticking Details for precise time checks View technical NTP information, including round-trip time and server stratum. Whether you are checking a timestamp, preparing a camera, aligning a wall clock, or setting a watch by hand, the seconds remain clear and easy to follow. AtomicClock is free to use. AtomicClock Pro is available as a one-time purchase with no subscription. It unlocks your preferred clock face, hands, and font, removes ads, and includes upcoming Pro features. AtomicClock displays NTP reference time for comparison and does not change your device’s system time. Results can vary with the selected server, network conditions, and device behavior.

Screenshots

Sun Clock App4 screens
AtomicClock4 screens

Verdict

The call

The clearest difference is rating: AtomicClock at 4.8 against Sun Clock App's 4.3. AtomicClock also leads on update cadence (every 3 weeks vs every 33 months) and ratings volume (5.5K vs 4). Sun Clock App's advantage is ads (none vs shown) and monetization model (free vs free with in-app purchases). On price, in-app purchases 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. Sun Clock App sells 1 one-off in-app purchase and AtomicClock sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

AtomicClock holds the better App Store score, 4.8 against 4.3. That said, the two scores are not equally well evidenced: AtomicClock has 5.5K ratings behind it against 4, so its average is the more settled of the two. Written reviews point the same way: 60% of Sun Clock App's written reviews are positive against 84% of AtomicClock's.

UpkeepUpdate frequency

Sun Clock App ships an update every 33 months, AtomicClock every 3 weeks. The most recent releases landed on September 25, 2026 and October 2, 2026 respectively.

Scorecard7 real differences · 3 level
Sun Clock App versus AtomicClock: the parameters behind the verdict, then further details
ParameterSun Clock AppAtomicClock
PriceFreeFree
Rating4.3 (4 ratings)4.8 (5.5K ratings) — better
Positive reviews60.0% of reviews84.2% of reviews — better
Number of ratings45.5K — better
Update frequencyEvery 33 monthsEvery 3 weeks — better
AdsNo — betterYes
In-app purchasesYesYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS9.0 — better15.0
Further details — not scored
Size2 MB17 MB
Age rating4+4+
DeveloperPiet JonasTimo Partl

Customer experience

Sun Clock App

All ratings4 ratings
Positive75.0%
Neutral0.0%
Negative25.0%
Written reviews5 reviews
Positive60.0%
Neutral0.0%
Negative40.0%

AtomicClock

All ratings5,539 ratings
Positive96.5%
Neutral1.8%
Negative1.8%
Written reviews241 reviews
Positive84.2%
Neutral3.3%
Negative12.4%

Bugs and requests

Sun Clock App

Not enough reviews yet to summarise bugs or requests.

AtomicClock

Reported bugs

3 issues
  • Crashes on certain iOS versions
  • Occasional freezing of hands
  • Countdown timer sound not working

Requested features

5 requests
  • Add GMT/dual time display
  • Implement widget support
  • Add different second hand sounds
  • Allow setting background color to match watch
  • Include alarm/timer functionality

In-app purchases

1 purchases

Sun Clock App

One-time1
  • Sun Clock - Upgrade$0.99
1 purchases

AtomicClock

One-time1
  • Lifetime Pro Version$6.99

Questions

Is Sun Clock App free?
Sun Clock App is free to download, with in-app purchases available.
Is AtomicClock free?
AtomicClock is free to download, with in-app purchases available.
Which has better reviews, Sun Clock App or AtomicClock?
AtomicClock is rated higher. Sun Clock App averages 4.3 out of 5 from 4 ratings, while AtomicClock averages 4.8 from 5.5K ratings.
Do Sun Clock App or AtomicClock have ads?
AtomicClock shows ads; Sun Clock App does not.
Which is updated more often, Sun Clock App or AtomicClock?
Sun Clock App ships an update every 33 months, and AtomicClock every 3 weeks. Most recently, Sun Clock App was updated on September 25, 2026 and AtomicClock on October 2, 2026.

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