Check the accurate server clock at a glance.

Ultra-accurate is a server time timer that measures the HTTP Date of the desired site multiple times and corrects the error with the server clock in milliseconds for moments where every second is important, such as course registration and ticketing. Drift tracking ensures accuracy over time, and PiP Timer lets you keep track of server times while using a browser or other apps.

Main features
- Precise synchronization: HTTP Date is collected multiple times, undergoes RTT correction, outlier removal, and EMA smoothing, then calculates the server time offset.
- Drift estimation: Tracks the drift of a device's clock based on measurement samples to correct for displayed time drift over time.
- PiP Server Time Timer: You can display the server time in the Picture in Picture window and check the time while viewing the course registration, ticketing, and reservation screens.
- Proven site presets: We provide presets that allow you to quickly select major domestic university course registration sites and ticketing/reservation sites.
- Improved site compatibility: By strengthening the HTTPS and Date header processing flow, more sites can reliably check the server time.
- Notification options: Screen notifications and sound notifications can be turned on and off respectively, allowing you to use them according to the situation.
- Multilingual support: Supports Korean, English, Japanese, and Simplified Chinese, and you can select the language within the app.

I recommend it to people like this
- Those who prepare for moments where server time is the standard, such as course registration, ticketing, and reservations.
- Those who want to view accurate server time and perform browser tasks simultaneously on their Android phone or tablet
- Those who always keep track of time using the PiP window and do not want to miss important moments

Precautions
- Synchronization may fail on sites that do not provide the HTTP Date header or have limited network response. In this case, please enter a different synchronization target server or use the app's preset.
- The Picture in Picture feature only works on supported devices such as Android 8.0 or higher.
- Sound notifications may be affected by your device's volume, silent mode, and notification settings.

Set the server time right now with extreme accuracy. Reliable synchronization, PiP timer, and notification options help you better prepare for important moments.