AtomicClock vs Cool Ukiyo
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- 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
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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.
Cool Ukiyo
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This is a digital and analog clock with a background of famous Ukiyo-e prints. You can choose from 40 different Ukiyo-e works from various periods. The time, analog clock, and Ukiyo-e can be moved with a finger. The analog clock and Ukiyo-e can be zoomed in and out with two fingers. Seconds can also be displayed. The background color can be selected from 5 different colors. Touching the time character switches to setting mode. When in setting mode, you can change the year, month, and day of the week to various formats by touching. The year, month, day of the week, a.m./p.m., and seconds can be erased. You can also switch between 12-hour and 24-hour displays. Rotation of the screen in portrait and landscape mode is also supported. The size of the text can be adjusted in steps by pressing buttons such as "2X" and "3X". The time signal can be selected from 78 different tones.
Screenshots
Verdict
The clearest difference is iOS requirement: Cool Ukiyo at 12.0 against AtomicClock's 15.0. On price, update cadence, 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
Both are free to download. AtomicClock sells 1 one-off in-app purchase and Cool Ukiyo sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.
AtomicClock ships an update every 3 weeks, Cool Ukiyo monthly. The most recent releases landed on September 24, 2026 and September 9, 2026 respectively.
| Parameter | AtomicClock | Cool Ukiyo |
|---|---|---|
| Price | Free | Free |
| Rating | 4.8 (5.5K ratings) — better | — |
| Positive reviews | 84.5% of reviews | — |
| Number of ratings | 5.5K — better | — |
| Update frequency | Every 3 weeks — better | Monthly |
| Ads | Yes | Yes |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.0 | 12.0 — better |
| Further details — not scored | ||
| Size | 17 MB | 53 MB |
| Age rating | 4+ | 4+ |
| Developer | Timo Partl | Mihoko Araki |
Bugs and 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
Cool Ukiyo
Not enough reviews yet to summarise bugs or requests.
In-app purchases
AtomicClock
- Lifetime Pro Version$6.99
Cool Ukiyo
- Cool Ukiyo-e Clock with no ads$3.99
Questions
Is AtomicClock free?
Is Cool Ukiyo free?
Do AtomicClock or Cool Ukiyo have ads?
Which is updated more often, AtomicClock or Cool Ukiyo?
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