Radio controlled atomic time syncing: JJY, WWVB & MSF emulator/simulator
4.91·19 reviews·100+ downloads
About SyncTime: JJY, WWVB & MSF
SyncTime: JJY, WWVB & MSF is a tools app developed by SWard Dev.
Download Statistics
SyncTime: JJY, WWVB & MSF has been downloaded 370 times. In the last 30 days, the app was downloaded 9 times. It is ranked in the top 100 tools apps.
User Ratings
SyncTime: JJY, WWVB & MSF is rated 4.91 out of 5 stars. The rating is based on 19 ratings.
App Information
SyncTime: JJY, WWVB & MSF costs $3.99 to download. The APK download size is 14.77 MB. The latest version available is 10. The last update was on August 29, 2025.
Technical Requirements
The app has a content rating of Everyone. The app has been available on Google Play October 2022.
Description
SyncTime syncs the time on your radio controlled atomic watch/clock — even when the time signal radio station is out of range.
SyncTime is comprised of a JJY, WWVB & MSF emulator/simulator.
Why Use SyncTime? - SyncTime is completely silent. - SyncTime allows you to override the timezone with any timezone of your choice. - SyncTime uses NTP time for the most accurate time (requires internet). - SyncTime allows you to sync the time when the screen is off or when SyncTime is running in the background. This feature is device dependent as some devices may close or mute SyncTime. - No Ads.
Supported Time Signals: JJY60 WWVB MSF
Due to the limitations of physics and the speakers used in Android devices, these time signals are the only signals capable of being supported whilst also being fully silent.
Instructions: 1. Turn your volume up to the maximum. 2. Place your radio controlled atomic watch/clock beside your speakers/headphones. 3. Activate the time sync on your watch/clock. 4. Select the time signal supported by your watch/clock. 5. (WWVB only) Select the timezone that is set on your watch/clock. Timezones include Pacific Time (PT), Mountain Time (MT), Central Time (CT), Eastern Time (ET), Hawaii Time (HT), and Alaska Time (AKT). 6. Press the play arrow to start syncing. After approximately 3-10 minutes your watch/clock should be synced.
Note: Watches/clocks which have a 'home city' setting may need to be set to a city which can receive the official radio station time signals. After syncing, the 'home city' can be reverted.
Recent changes: Added support for 16 KB memory page sizes.
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It does what it says. It's not silent, but I'm not too bothered by it. One issue is it doesn't send DST. You can work around by setting the timezone override, but the timezone you have to override to makes very little sense. I set it to ETC/-1GMT to get it to advance my clock forward 1hr for DST. It would be better if there were a checkbox to send the flag for DST as my clock picks that up and even changes the timezone to indicate DST. I tested and confirmed the real WWVB signal sends DST state.
★★★★★Kum Fung· Jul 21, 2025
This app is truly silent when it is generating its WWVB time signal, unlike the free apps. You can run this app on your phone/tablet and be in the same room with it without going deaf. I use this app to sync wall clocks from La Crosse and Geevon when the real WWVB signal is weak. The only con is that its generated signal is weaker than those from the noisy free apps, so the watch/clock will need to be closer to the phone/tablet to pick up the signal. It's the trade-off for no loud beeping noise.
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