# CHALLNA: Precise Server Clock > 0.01 seconds make all the difference in ticketing and course registration. Canonical page: [https://chrome-stats.com/d/com.rynyul.challna](https://chrome-stats.com/d/com.rynyul.challna) ## Overview - **ID:** `com.rynyul.challna` - **Platform:** Android - **Type:** Android app - **Status:** Available - **Publisher:** RYNYUL - **Category:** TOOLS - **Downloads:** 130 - **Version:** 1.0.3 - **Last updated:** 2026-03-27 - **First published:** 2026-02-22 - **Publisher country:** KR - **Size:** 21 MB - **Data as of:** 2026-09-09 - **Store listing:** [Google Play Store](https://play.google.com/store/apps/details?id=com.rynyul.challna) - **Website:** [http://rynyul.com](http://rynyul.com/) - **Privacy policy:** [https://rynyul.com/app/challna/privacy/android.html](https://rynyul.com/app/challna/privacy/android.html) ## Description ■ 0.01 Seconds Make All the Difference.
Have you ever missed out on popular concert tickets, course registrations, or limited-edition drops by a split second? Don’t rely on your phone’s local time. Check the "Real Server Time" of the site itself. 'CHALLNA' will drastically increase your success rate.

■ Why CHALLNA? (Key Features)

1. Millisecond(ms) Precision Synchronization
We do more than just fetch server time. CHALLNA calculates network latency (RTT) and average transmission deviations in real-time to correct any errors. Find the "true" 0.01 second with Korea’s highest level of precision.

2. One-Touch Server Presets
Interpark, YES24, Melon Ticket, and even major university registration sites! No need to type addresses manually. Simply search to instantly register and track your desired server.

3. Intuitive Countdown & Target Setting
Set your goal time and watch the countdown in real-time down to the millisecond. Stay perfectly prepared for that high-pressure moment right before the opening.

4. Click Practice for Real-World Reflexes
Theory is different from practice! Use the built-in 'On-the-Dot Click Practice' to check your reaction speed and master the feeling of clicking at exactly 0.00 seconds.

5. Smart Reminders & Schedule Registration (HOT!)
Register your important ticketing or course registration schedules. We’ll make sure you’re ready with custom notifications before your target time, even in your busy daily life.

6. Direct Site Access
Why check the time and switch apps separately? CHALLNA provides direct outlinks to the sites, shortening your access time to the absolute minimum.

7. Dynamic Island Support
Keep tracking the time via Dynamic Island even while moving to the ticketing site, ensuring you never miss the countdown. (Available on iPhone 14 Pro and later models)

■ Highly Recommended For:
• Concert fans tired of losing out in "Blood-keting" (bloody ticketing).
• Students desperate to secure popular university courses.
• Anyone needing perfect timing for holiday train bookings or limited drops.
• Perfectionists who won't settle for even a 0.01-second error.

■ Please Note:
• Minor errors may occur depending on network conditions. We recommend using a stable Wi-Fi, 5G, or LTE environment.
• For the best results, be sure to use the 'Click Practice' feature in advance!

Download 'CHALLNA' now and experience the miracle of 0.01 seconds! ## Rankings - #1,871,712 — Overall ## Permissions and access ### Permissions - `android.permission.ACCESS_ADSERVICES_AD_ID` - `android.permission.ACCESS_ADSERVICES_ATTRIBUTION` - `android.permission.ACCESS_NETWORK_STATE` - `android.permission.INTERNET` - `android.permission.POST_NOTIFICATIONS` - `android.permission.RECEIVE_BOOT_COMPLETED` - `android.permission.VIBRATE` - `android.permission.WAKE_LOCK` - `com.android.vending.CHECK_LICENSE` - `com.google.android.c2dm.permission.RECEIVE` - `com.google.android.finsky.permission.BIND_GET_INSTALL_REFERRER_SERVICE` - `com.google.android.gms.permission.AD_ID` - `com.rynyul.challna.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION` ## Similar extensions and apps - [ServerClock: Precise Time Sync](https://chrome-stats.com/d/com.smartkit.servertime.servertime) — 6,158 users - [네오타임: 실시간 서버시간 체크, 티켓팅·수강신청 알림](https://chrome-stats.com/d/com.bfdev.neotime) — 8 users - [ClickTimer - Ticketing Timer](https://chrome-stats.com/d/com.hedvion.gwangclock) — 47 users - [Server Time Widget](https://chrome-stats.com/d/com.DevR.servertime) — 6,407 users - [ServerClock](https://chrome-stats.com/d/com.judisoft.serverbaro) — 708 users - [올클러 - 수강신청/티켓팅 올클러를 위한 필수 앱](https://chrome-stats.com/d/com.jungwuk.allclearer) — 39 users - [타임핏-서버시간알림이](https://chrome-stats.com/d/kr.co.simplebestapp.timefit) — 2,193 users - [Second-Sync](https://chrome-stats.com/d/com.minjun.sugangtime) — 16,609 users - [TicketTimer: Booking Essential](https://chrome-stats.com/d/monster.util.time) — 1 users - [Clock](https://chrome-stats.com/d/com.pikcn.clock) — 30 users - [Floating clock - teleprompter](https://chrome-stats.com/d/com.fullstack.desktopClock) — 965 users - [Atomic Clock](https://chrome-stats.com/d/com.fsphost.atomicclock) — 73,017 users, 3.90 / 5 --- Source: [Chrome-Stats](https://chrome-stats.com/d/com.rynyul.challna)