Comparison

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.

Head to head
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.

About

秒合わせ ー その一秒を逃さない

Features
Read full description

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

AtomicClock4 screens
秒合わせ ー その一秒を逃さない1 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

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.

UpkeepUpdate frequency

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.

Scorecard4 real differences · 6 level
AtomicClock versus 秒合わせ ー その一秒を逃さない: the parameters behind the verdict, then further details
ParameterAtomicClock秒合わせ ー その一秒を逃さない
PriceFreeFree
Rating4.8 (5.6K ratings) — better—
Positive reviews84.3% of reviews—
Number of ratings5.6K — better—
Update frequencyMonthlyDaily — better
AdsYesNo — better
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS17.413.0 — better
Further details — not scored
Size17 MB4 MB
Age rating4+4+
DeveloperTimo 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

1 purchases

AtomicClock

One-time1
  • Lifetime Pro Version$6.99
None

秒合わせ ー その一秒を逃さない

No in-app purchases

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.

Other comparisons