Second vs Nook
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Second
This utility app provides precise server time synchronization down to milliseconds, crucial for time-sensitive events like registrations and 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 sustained accuracy
- Picture-in-Picture (PiP) timer
- Example site shortcuts
- Multilingual support
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Precise server time, at a glance. Second-Sync is a time synchronization tool for moments where one second matters, such as course registration and ticketing. It multi-samples the HTTP Date of your chosen site and aligns the difference from the server clock down to milliseconds. Drift tracking maintains accuracy over time, while the PiP timer lets you watch live server time even when using other apps. Key features - Precise synchronization: collects HTTP Date in parallel at least 30 times, then calculates the offset after RTT compensation, outlier removal, and EMA smoothing. - Drift estimation: runs linear regression on measured samples to track the slope of the device clock and maintain accuracy as time passes. - PiP timer: opens a Picture in Picture timer as a companion app, so you can monitor the server clock live while using a browser or other apps. - Example site shortcuts: quick buttons to load course registration pages for major Korean universities and ticket booking sites. - Multilingual support: supports Korean, English, Japanese, and Simplified Chinese, with a separate in-app language setting. Recommended for - Anyone who wants exact server time in situations where it is critical, such as registration, ticketing, or reservations. - Anyone who wants to keep accurate server time visible on iPhone or iPad while booking on the go. Notes - Synchronization may fail on sites that do not support the HTTP Date header. If so, enter another target server or use the example sites in the app. - Picture in Picture works only on supported devices running iOS 15 or later, including iPadOS. - Sync your server time with Second-Sync now. One button gives you stable synchronization and a PiP timer, so you do not miss the important moment!
Nook
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누크(Nook)는 ‘지금 갈 수 있는지’를 알려주는 실시간 상권 상황판 앱입니다. 점심시간이나 저녁시간에 가게 앞에서 기다릴지 말지 고민해본 적이 있거나, 전화해서 물어보기는 애매하고 직접 가보기에는 시간은 아까웠던 경험에서 출발했습니다. 누크에서는 여유로운지, 자리가 몇 개 남았는지, 웨이팅이 있는지와 대기 시간, 지금 만석인지, 영업이 마감되었는지를 한눈에 확인할 수 있으며, 이 정보는 사장님이나 알바가 복잡한 설정 없이 버튼 한 번으로 직접 업데이트해 추정이 아닌 실제 상황을 그대로 반영합니다. 덕분에 사용자는 헛걸음 없이 지금 갈 수 있는 곳만 골라 이동할 수 있고, 줄을 서서 기다릴지 아니면 다른 곳을 선택할지 빠르게 판단할 수 있습니다. 점심시간이 짧은 학생이나 기다림 없이 식사하고 싶은 직장인, 카페 자리가 중요한 사람, 웨이팅이 부담되는 사용자에게 특히 유용하며, 가게 입장에서도 “지금 자리 있어요?” 같은 반복적인 전화 문의를 줄이고 가게 상황을 솔직하게 전달해 불필요한 대기와 혼잡을 줄일 수 있습니다. 누크는 특정 상권을 중심으로 시작해 정확하고 믿을 수 있는 실시간 정보를 만드는 데 집중하며, 지금 이 순간의 상권을 한눈에 확인할 수 있도록 돕는 서비스입니다.
Screenshots
Verdict
The clearest difference is in-app purchases: Nook at none against Second's 1. Nook also leads on ads (none vs shown) and iOS requirement (13.0 vs 15.0). Second's advantage is update cadence (every 4 days vs every 2 weeks). 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. Second sells 1 one-off in-app purchase. Nook asks for nothing beyond the download.
Second ships an update every 4 days, Nook every 2 weeks. The most recent releases landed on October 11, 2026 and October 5, 2026 respectively.
| Parameter | Second | Nook |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (4 ratings) — better | — |
| Positive reviews | 88.9% of reviews | — |
| Number of ratings | 4 — better | — |
| Update frequency | Every 4 days — better | Every 2 weeks |
| Ads | Yes | No — better |
| In-app purchases | Yes | No — better |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.0 | 13.0 — better |
| Further details — not scored | ||
| Size | 55 MB | 71 MB |
| Age rating | 4+ | 4+ |
| Developer | Minjun Kim | JEONGHUN YU |
In-app purchases
Second
- 초정확 Pro 업그레이드$1.99
Nook
No in-app purchases









