# AtomicClock vs Cool Ukiyo

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.

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.

## The numbers

| Metric | AtomicClock | Cool Ukiyo |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (5.5K ratings)](https://appshunter.io/ios/app/atomicclock-ntp-time/id1402993049/reviews)** | — |
| Number of ratings | **5.5K** | — |
| Positive reviews | 84.5% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | Yes | Yes |
| Update frequency | **Every 3 weeks** | Monthly |
| Monetization | Free with in-app purchases | — |
| Size | 17 MB | 53 MB |
| Requires iOS | 15.0 | **12.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Timo Partl](https://appshunter.io/developer/1387413672) | [Mihoko Araki](https://appshunter.io/developer/1476136915) |

## What reviewers say

### AtomicClock

[App page](https://appshunter.io/ios/app/atomicclock-ntp-time/id1402993049)

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:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Lifetime Pro Version | $6.99 | one-time |

**What reviewers like**

- 🚀 Accurate time
- 👍 Highly customizable
- 🚀 Precise to the second
- 👍 Easy to use
- 👍 Helpful for setting watches

**What reviewers complain about**

- 🐛 Server connection issues
- 🔍 Limited time zone options
- 💰 Ads diminish clock view
- 🔍 Lacks some advanced features
- 🔍 Redundant for some users

**Reported bugs**

- Crashes on certain iOS versions
- Occasional freezing of hands
- Countdown timer sound not working

**Requested features**

- 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

[App page](https://appshunter.io/ios/app/cool-ukiyo-e-clock/id6503263276)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Cool Ukiyo-e Clock with no ads | $3.99 | one-time |


## Frequently asked questions

### Is AtomicClock free?

AtomicClock is free to download, with in-app purchases available.

### Is Cool Ukiyo free?

Cool Ukiyo is free to download, with in-app purchases available.

### Do AtomicClock or Cool Ukiyo have ads?

Both AtomicClock and Cool Ukiyo show ads.

### Which is updated more often, AtomicClock or Cool Ukiyo?

AtomicClock ships an update every 3 weeks, and Cool Ukiyo monthly. Most recently, AtomicClock was updated on September 24, 2026 and Cool Ukiyo on September 9, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*