Comparison

Second vs Jangsoo

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Second

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

Highlights
  • Precise server time synchronization
  • Drift tracking for accuracy
  • Picture-in-Picture timer
  • Example site shortcuts
  • Multilingual support
Features
Read full description

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!

About

Jangsoo

Features
Read full description

Jangsoo 앱은 제품과 함께 제공된 QR 안내를 통해 설치하는 전용 리모컨 앱입니다. ■ 주요 기능 • 좌/우 독립 온도 조절과 실시간 온도 확인 • 전원 및 운전 모드(일반·수면·여름·외출) 제어 • 기상 알람, 켜짐/꺼짐 예약 • 잠금, 초장파, 안전모드 설정 • 가족 공유: 기기 코드 입력만으로 간편 초대 (회원가입·로그인 불필요) ■ 이용 안내 • 본 앱은 Wi-Fi 통신을 지원하는 지정 모델 전용입니다. 제품 설명서의 QR 코드로 안내받아 설치하신 경우 바로 사용하실 수 있습니다. • 별도의 회원가입 없이 사용합니다. ■ 접근 권한 안내 • 위치, 블루투스: 침대 최초 연결(기기 검색)과 제어 화면의 지역·바깥 온도 표시에 사용됩니다. • 알림: 기기 상태 알림 수신에 사용됩니다. • 모든 권한은 선택적이며, 거부해도 기본 온도 제어는 사용할 수 있습니다. ■ 문의 우리엘전자주식회사 · josephlee@uriel.kr

Screenshots

Second4 screens
Jangsoo4 screens

Verdict

The call

The clearest difference is in-app purchases: Jangsoo at none against Second's 1. Jangsoo also leads on ads (none vs shown). Second's advantage is update cadence (every 3 days vs every 11 days) and iOS requirement (15.0 vs 17.0). 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. Second sells 1 one-off in-app purchase. Jangsoo asks for nothing beyond the download.

UpkeepUpdate frequency

Second ships an update every 3 days, Jangsoo every 11 days. The most recent releases landed on November 6, 2026 and October 31, 2026 respectively.

Scorecard4 real differences · 6 level
Second versus Jangsoo: the parameters behind the verdict, then further details
ParameterSecondJangsoo
PriceFreeFree
Rating5.0 (4 ratings) — better—
Positive reviews88.9% of reviews—
Number of ratings4 — better—
Update frequencyEvery 3 days — betterEvery 11 days
AdsYesNo — better
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS15.0 — better17.0
Further details — not scored
Size69 MB31 MB
Age rating4+4+
DeveloperMinjun KimURIEL ELECTRONICS Inc.

In-app purchases

1 purchases

Second

One-time1
  • 초정확 Pro 업그레이드$1.99
None

Jangsoo

No in-app purchases

Questions

Is Second free?
Second is free to download, with in-app purchases available.
Is Jangsoo free?
Jangsoo is free to download, with no in-app purchases.
Do Second or Jangsoo have ads?
Second shows ads; Jangsoo does not.
Which is updated more often, Second or Jangsoo?
Second ships an update every 3 days, and Jangsoo every 11 days. Most recently, Second was updated on November 6, 2026 and Jangsoo on October 31, 2026.

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