Atomic Sync : Radio Watch Time

Sync your atomic watch anywhere! Emulates WWVB, DCF77, JJY, MSF, BPC signals. Works with Casio, Citizen & more. Free with Beast Mode.

Sync Your Radio-Controlled Watch in Minutes!

Atomic Sync emulates official atomic time signals to synchronize your radio-controlled watch — no tower reception needed. Works with Casio G-Shock, Citizen, Lacrosse, Junghans, Braun and other atomic watches.

SUPPORTED TIME SIGNALS: • WWVB (60 kHz) — United States • DCF77 (77.5 kHz) — Germany / Europe • JJY40 / JJY60 (40/60 kHz) — Japan • MSF (60 kHz) — United Kingdom • BPC (68.5 kHz) — China • RBU (66.66 kHz) — Russia

HOW IT WORKS:

1. Select your region or time signal
2. Place your phone near your watch (see visual guide)
3. Tap Start and wait 1-10 minutes
4. Your watch syncs to atomic time — done!

BEAST MODE (Premium Sync): Need faster sync? Watch a short rewarded video to activate Beast Mode — our enhanced signal algorithm for quicker, more reliable synchronization. Unlimited use, no subscriptions.

SMART REMINDERS: Set local notifications to remind you to sync your watch daily, weekly, bi-weekly, monthly or custom. Never lose atomic precision again.

OFFLINE & ACCURATE: • All signals generated locally — no internet required for sync • Optional NTP time source sync for maximum accuracy when online • Last known time cached for offline use

USER-FRIENDLY DESIGN: • Dark/Light theme (auto-switch) • Universal positioning guide with animated signal waves • Simple 4-step flow, no brand selection needed • 16 languages supported

PRIVACY FIRST: • No location access required • No personal data collected • No account registration needed

COMPATIBLE WITH: Casio G-Shock, Pro Trek, Edifice • Citizen Eco-Drive • Lacrosse Technology • Junghans Mega • Braun watches • And any watch supporting WWVB/DCF77/JJY/MSF/BPC signals.

TIPS FOR SUCCESS: • Use maximum phone volume during sync • Keep phone and watch still, 2-10 cm apart • Avoid metal surfaces and electronic interference

DISCLAIMER: Atomic Sync is a third-party tool and is not affiliated with, endorsed by, or connected to Casio, Citizen, or any watch manufacturer. Time signal emulation is for personal use only. Success depends on watch model, environment, and device hardware.