Atomic Sync : Radio Watch Time
Radio Watch Time Sync
About
Synchronize your radio-controlled watch using your phone's speaker to emulate atomic time signals. Supports various international time signals and offers smart reminders for regular synchronization. Works offline and prioritizes user privacy.
What's New in Atomic Sync
1.0.2
April 22, 2026
• Fixed several bugs to improve app stability and performance. • Under-the-hood optimizations for a smoother user experience.
Developer apps
FAQ
Does Atomic Sync have ads?
Yes, Atomic Sync contains advertisements. Users can watch a rewarded video to activate 'Beast Mode' for quicker, more reliable synchronization, which offers unlimited use without subscriptions.
How accurate is Atomic Sync?
Atomic Sync emulates official atomic time signals for synchronization. For maximum accuracy when online, it offers an optional NTP time source sync. The app's success depends on the watch model, environment, and device hardware.
What watches are compatible with Atomic Sync?
Atomic Sync is 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.
Can I use Atomic Sync offline?
Yes, all signals are generated locally, so no internet is required for synchronization. The app also caches the last known time for offline use.
How often is Atomic Sync updated?
The latest version, 1.0.2, was released on April 22, 2026. The app was initially released on April 7, 2026, indicating recent development activity.
What time signals does Atomic Sync support?
Atomic Sync supports WWVB (United States), DCF77 (Germany/Europe), JJY40/JJY60 (Japan), MSF (United Kingdom), BPC (China), and RBU (Russia).
Is Atomic Sync safe for children?
Atomic Sync has an age rating of 4+, making it suitable for younger users. The app also prioritizes privacy by not requiring location access, collecting personal data, or needing account registration.
What is 'Beast Mode' in Atomic Sync?
'Beast Mode' is a premium sync feature that uses an enhanced signal algorithm for quicker and more reliable synchronization. It can be activated by watching a short rewarded video and offers unlimited use without subscriptions.
