Second-Sync

PiP timer for crucial moments

Free · In-App Purchases

Precise server time, at a glance. Second-Sync is a time synchronisation tool for moments where one second matters, such as course enrolment 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 synchronisation: 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 enrolment 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 enrolment, ticketing or reservations. - Anyone who wants to keep accurate server time visible on iPhone or iPad while booking on the go. Notes - Synchronisation 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 synchronisation and a PiP timer, so you do not miss the important moment!

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Changed the PiP timer scheduled stop option to be off by default. When scheduled stop is enabled, the default stop time is now set to five minutes after opening the options sheet. Moved server-time sync to the Sync button beside the address bar and expanded the example-site list area.

Version 1.3.3

The developer, Minjun Kim, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

  • Data Not Collected

    The developer does not collect any data from this app.

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    Accessibility

    The developer has not yet indicated which accessibility features this app supports. Learn More

    Information

    Size
    • 43.7 MB
    Category
    • Utilities
    Compatibility
    Requires iOS 15.6 or later.
    • iPhone
      Requires iOS 15.6 or later.
    • iPad
      Requires iPadOS 15.6 or later.
    • iPod touch
      Requires iOS 15.6 or later.
    • Apple Vision
      Requires visionOS 1.0 or later.
    Languages
    English and 3 more
    • English, Japanese, Korean, Simplified Chinese
    Age Rating
    4+
    In-App Purchases
    Yes
    Provider
    Minjun Kim
    • Minjun Kim has identified itself as a trader for this app and confirmed that this product or service complies with European Union law.
    • Address
      South Korea
      Seoul
      Seoul
      35, Cheonho-daero 37-gil
      Room 302
      Dongdaemun-gu
      02563
    • Phone Number
      +82 1065577858
    • Email
      mtmt906@gmail.com
    Copyright
    • © Minjun Kim 2025.
  • Developer Website
  • Privacy Policy

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