WWVB Emulator

Contains ads
4.7
309 reviews
10K+
Downloads
Content rating
Everyone
Screenshot image
Screenshot image

About this app

Attention: There are a lot of people this application requests, so it's made. But there is no environment that a maker tests. Operation guaranteed won't be done.

Note
It can not correspond to the atomic clock. Please adjust the NPC time with other apps.
Correspondence in this application is not planned.
We will receive more emails requesting radio clocks from other countries, but since you can not create it without materials, please attach the clear material you need.

How to use
Place headphone speakers by the atomic radio clock's internal antenna, with the volume as high as possible before it starts to distort. Or, place the clock’s internal radio antenna as close as possible to the smartphone speaker. Again, with the volume as high as possible before it starts to distort. When time sync receive mode is active, the clock will sync within 2 to 3 minutes.
Updated on
Jul 4, 2025

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
No data shared with third parties
Learn more about how developers declare sharing
No data collected
Learn more about how developers declare collection
Data is encrypted in transit
Data can’t be deleted

Ratings and reviews

4.7
304 reviews
DerekS8625
January 3, 2025
Excellent app! Does exactly what it's intended to do, and makes an excellent backup when the WWVB signal is too weak or compromised. While it may not be 100% to the precise second (it uses your phone clock which may be off by a few milliseconds) according to NIST or USNO atomic time systems, it still does the job VERY well. The key is to have the phone volume all the way up and hold the phone's speaker as close as possible to the antenna system of the time piece you wish to sync. Works well!!!
2 people found this review helpful
Did you find this helpful?
Shawn Dye
February 15, 2023
I really like this app. It works great with my radio controlled digital clock. I do have a little tip for anyone who sees this... To get the most accurate time, consider adjusting your phone system time to most accurately match the atomic (NIST) time. Then sync the time to your radio controlled clock with this app. Your clock should then match NIST time down to the second when sync is complete. Just be sure to set your phone's time setting back to automatic when done.
9 people found this review helpful
Did you find this helpful?
Bill Boguniecki
November 5, 2023
Incredible. It works. I have several Casio G-shock watches and in CT I get at best an L1 signal and most of the time ERR. Put watches on table. Open app. Turn volume all the way up. Wait ..... few minutes later. GET! All watches synch up! Amazing app. Just don't touch watches while syncing. They need to be still. Put phone speaker right near them and volume all the way up. It works!
3 people found this review helpful
Did you find this helpful?

What’s new

Changed target SDK version

App support

About the developer
法量 秀樹
mokyu9@outlook.com
Japan
undefined