AtomicClock vs 秒合わせ ー その一秒を逃さない
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.
秒合わせ ー その一秒を逃さない
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秒合わせ(Second Sync)― その一秒を逃さない。 「狙った秒ちょうど」に動きたい。そんな場面のための、秒単位のタイマーです。 ■ こんなときに ・人気店の予約電話を、受付開始の秒に合わせてかけたい ・チケットの先着販売に、1秒でも早く挑みたい ・SNSの投稿やライブ配信を、決めた時刻ぴったりに始めたい ■ 特長 ・目標の時刻を「秒」までセットして、カウントダウン ・「1秒前に予告」=短い音とアナウンスで、心の準備ができる ・通知は 音/バイブ/音+バイブ/サイレント から選べる ・「自然送信アシスト」=毎回ぴったり同じ秒にならないよう、数秒だけ自然にずらせる ・よく使う時刻を「お気に入り」に保存 ・「あと○秒で開始」のクイックボタン ■ プライバシー 入力した内容は、すべて「この端末の中だけ」に保存されます。 外部のサーバーに送ることは一切ありません。アカウント登録も不要です。 一秒に、間に合う。
Screenshots
Verdict
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.
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. 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.
| Parameter | AtomicClock | 秒合わせ ー その一秒を逃さない |
|---|---|---|
| Price | Free | Free |
| Rating | 4.8 (5.6K ratings) — better | — |
| Positive reviews | 84.3% of reviews | — |
| Number of ratings | 5.6K — better | — |
| Update frequency | Monthly | Daily — better |
| Ads | Yes | No — better |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 17.4 | 13.0 — better |
| Further details — not scored | ||
| Size | 17 MB | 4 MB |
| Age rating | 4+ | 4+ |
| Developer | Timo Partl | 株式会社アドニス |
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
秒合わせ ー その一秒を逃さない
Not enough reviews yet to summarise bugs or requests.
In-app purchases
AtomicClock
- Lifetime Pro Version$6.99
秒合わせ ー その一秒を逃さない
No in-app purchases









