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Second-Sync

Second-Sync

PiP timer for crucial moments

4 ratings
36 reviews
With Ads
🔧 Utilities
📊 Productivity
Free
In-App PurchasesWith Ads

Details

Released
September 23, 2025
Updated
October 30, 2026

Features

Developer

Minjun Kim
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Second-Sync video #1 for iPhone
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iphone
ipad
🧾$1.99
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❓8 answered
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About

This utility app provides precise server time synchronization down to milliseconds, ideal for critical moments like course registration or ticketing. It features drift tracking for sustained accuracy and a Picture-in-Picture timer for live monitoring while using other applications.

✓Precise server time synchronization
✓Drift tracking for accuracy
✓Picture-in-Picture timer
✓Example site shortcuts
✓Multilingual support
Show original description
+3

What's New in Second

2.0.2

October 30, 2026

1. Упрощённый тест скорости - Остались только нужные замеры, поэтому он проходит быстрее. 2. Улучшен режим тренировки - В режиме автоактивации кнопки больше нет индикатора загрузки, которого нет на настоящем сайте.

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2

Subscriptions & In-App Purchases

$1.99

초정확 Pro 업그레이드

광고 제거와 고정밀 서버시간·테마·연습 모드를 한 번에 해제

User reviews

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건의사항

아이폰에서 인강볼 때 현재 시간 표시하는데 쓰고 있어요. 혹시 가로 화면에서 시계를 세로로 세워서 보는 옵션 가능할까요? 감사합니다.
서서초구민

Response from developer

다음 버전에 구현 예정입니다! 업데이트 하시고 사용해보시고 별점 올려주시면 감사하겠습니다! 🙇🏻

역시 초정확!!!

손가락만 잘못되지 않는다면 할수 있어요!!!
아아이고오~77

Response from developer

믿고 사용해주셔서 정말 감사합니다!! 저도 제 앱만 믿고 티켓팅합니다 ㅎㅎ..

내가 써본 것 중에 최고

진짜 이거 하나면 모든게 다 끝
ㅇㅇㅎㄴㅎㅇㅎㄹㅎ

Response from developer

극찬 정말 감사합니다. 🥹 업데이트 할 때 피곤하고 힘들 때 마다 이런 리뷰들 생각해서 힘내곤 합니다. 다시 한 번 정말 감사합니다!!

표준시간 반영이...

안되는거 같습니다. 시차가 있는. 다른나라 선택에도 우리나라 시간 나오거나 동기화 실패안내창만 뜨네요 ㅠㅠ. 결제까지 해봤는데 ㅠㅠ.
속속이터진다터져

Response from developer

현재 원인 파악 중에 있습니다. 불편을 드려 죄송합니다. 해당 기능은 출시 직전에 분명 테스트를 하고 출시했는데 추후 업데이트를 하면서 문제가 된 것 같습니다. 수정이 되는대로 여기 답변으로 알려드리겠습니다. +) 업데이트로 고쳐졌습니다. 불편을 드려 정말 죄송합니다.

아 절 받으세요 진짜

초정확 모바일로 황민현 팬미 2열 중앙 잡았습니다🧡🍑
ෆ˶ෆ⸒⸒⸜( ˶’ᵕ‘˶)⸝

Response from developer

정말요?! 😳 잘 다녀오세요! 🫡 사용해주시고 리뷰도 남겨주셔서 정말 감사합니다! 🙇🏻

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FAQ

What is Second-Sync?

Second-Sync is a utility application designed to provide highly accurate server time synchronization, down to milliseconds. It's particularly useful for time-sensitive events like course registrations and ticket purchases.

How does Second-Sync achieve precise synchronization?

It achieves precision by multi-sampling the HTTP Date from chosen websites, calculating the offset after compensating for Round Trip Time (RTT), removing outliers, and applying Exponential Moving Average (EMA) smoothing.

Does Second-Sync have ads?

Yes, Second-Sync contains advertisements. It is a free application with in-app purchases.

What is the Picture-in-Picture (PiP) timer feature?

The PiP timer allows you to monitor the live server time in a small, floating window, even when you are using other applications on your device. This feature requires iOS 15 or later.

What devices is Second-Sync compatible with?

Second-Sync is available for iPhone and iPad devices. The Picture-in-Picture functionality specifically works on supported devices running iOS 15 or later, including iPadOS.

How often is Second-Sync updated?

The latest version, 2.0.2, was released on October 30, 2026. The app is actively maintained, with updates typically released to improve performance and features.

What languages does Second-Sync support?

Second-Sync offers multilingual support, including Korean, English, Japanese, and Simplified Chinese. Users can select their preferred language through a separate in-app setting.

What should I do if synchronization fails on a specific site?

Synchronization may fail on sites that do not support the HTTP Date header. In such cases, you can try entering another target server or utilize the provided example site shortcuts for major Korean universities and ticket booking sites.