AtomicClock vs TimeSync
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.
TimeSync
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TimeSyncは、NTP(Network Time Protocol)サーバーと通信して正確な時刻を取得し、お使いの端末との時刻差を表示するシンプルな時計アプリです。 ■ 主な機能 ・NTPサーバーとの通信による正確な時刻取得 ・端末の時刻とのズレをミリ秒単位で表示 ・通信の往復遅延(RTT)を表示 ・ワンタップで再同期 ■ 4種類のデザインから選べる 設定画面から、お好みの見た目に切り替えられます。 ・Cosmic: 宇宙と地球をモチーフにしたダークテーマ ・Pastel: 淡い色使いの明るいテーマ ・Cyber: ターミナル風の緑基調テーマ ・Analog: 実際に針が動くアナログ時計 ■ 多言語対応 日本語・English・简体中文・繁體中文・한국어・Español・Français・Deutschに対応しています。 無料でお使いいただけます(広告表示あり)。広告を非表示にするApp内課金もご用意しています。
Screenshots
Verdict
The clearest difference is update cadence: TimeSync at every 2 days against AtomicClock's every 3 weeks. On price, ads, in-app purchases 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 and TimeSync 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, TimeSync every 2 days. The most recent releases landed on October 14, 2026 and October 5, 2026 respectively.
| Parameter | AtomicClock | TimeSync |
|---|---|---|
| Price | Free | Free |
| Rating | 4.8 (5.5K ratings) — better | — |
| Positive reviews | 84.2% of reviews | — |
| Number of ratings | 5.5K — better | — |
| Update frequency | Every 3 weeks | Every 2 days — better |
| Ads | Yes | Yes |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 15.0 — better | 16.0 |
| Further details — not scored | ||
| Size | 17 MB | 7 MB |
| Age rating | 4+ | 4+ |
| Developer | Timo Partl | YOSHITADA SAITO |
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
TimeSync
Not enough reviews yet to summarise bugs or requests.
In-app purchases
AtomicClock
- Lifetime Pro Version$6.99
TimeSync
- 広告削除$0.49









