# AtomicClock vs 秒合わせ ー その一秒を逃さない

The clearest difference is in-app purchases: 秒合わせ ー その一秒を逃さない at none against AtomicClock's 1. 秒合わせ ー その一秒を逃さない also leads on ads (none vs shown) and update cadence (daily vs monthly). On price and device support there is nothing between them.

Both are free to download. AtomicClock sells 1 one-off in-app purchase. 秒合わせ ー その一秒を逃さない asks for nothing beyond the download.

AtomicClock ships an update monthly, 秒合わせ ー その一秒を逃さない daily. The most recent releases landed on October 19, 2026 and October 3, 2026 respectively.

## The numbers

| Metric | AtomicClock | 秒合わせ ー その一秒を逃さない |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (5.6K ratings)](https://appshunter.io/ios/app/atomicclock-ntp-time/id1402993049/reviews)** | — |
| Number of ratings | **5.6K** | — |
| Positive reviews | 84.3% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Monthly | **Daily** |
| Monetization | Free with in-app purchases | — |
| Size | 17 MB | 4 MB |
| Requires iOS | 17.4 | **13.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Timo Partl](https://appshunter.io/developer/1387413672) | [株式会社アドニス](https://appshunter.io/developer/6794356298) |

## 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


### 秒合わせ ー その一秒を逃さない

[App page](https://appshunter.io/ios/app/id6794417274)

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

**In-app purchases:** none


## Frequently asked questions

### Is AtomicClock free?

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

### Is 秒合わせ ー その一秒を逃さない free?

秒合わせ ー その一秒を逃さない is free to download, with no in-app purchases.

### Do AtomicClock or 秒合わせ ー その一秒を逃さない have ads?

AtomicClock shows ads; 秒合わせ ー その一秒を逃さない does not.

### Which is updated more often, AtomicClock or 秒合わせ ー その一秒を逃さない?

AtomicClock ships an update monthly, and 秒合わせ ー その一秒を逃さない daily. Most recently, AtomicClock was updated on October 19, 2026 and 秒合わせ ー その一秒を逃さない on October 3, 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.*