Floating Clock vs Second

Keep a floating clock in view while you use other apps. See a website's server time as you browse a booking page, and chat with others while you wait. Keep a floating clock over other apps • Use Picture in Picture (PiP) to keep server time visible while you browse or book tickets in another app. • Choose how often the clock alerts you, with sound and color cues starting 10 seconds beforehand. Check server time and the time difference • When you open a site for the first time, the app measures its server time and shows how it differs from your iPhone's clock. • Time is displayed in hundredths of a second. You can also check the estimated measurement error. See the time on your Lock Screen and Dynamic Island • Use Live Activities to see server time, down to the second, on your Lock Screen. • On compatible iPhones, Dynamic Island shows the site's name and time. Chat while you wait • Share queue numbers and server status in the chat room for your site, and react to messages with emoji. • Join the Lounge to talk with other app users. Schedule reminders by server time • Set a reminder for the top of the next hour or midnight tonight. • Choose 5, 3, or 1 minute before the scheduled time, or at the time itself.

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!