SyncTime: JJY, WWVB & MSF

SWard Dev

4.91

19 reviews

100+
Downloads

$3.99

Radio controlled atomic time syncing: JJY, WWVB & MSF emulator/simulator

SyncTime: JJY, WWVB & MSF Screenshot 1 of 4

SyncTime: JJY, WWVB & MSF Screenshot 2 of 4

SyncTime: JJY, WWVB & MSF Screenshot 3 of 4

SyncTime: JJY, WWVB & MSF Screenshot 4 of 4

Pros & Cons

Silent, ad-free operation
Supports JJY60, WWVB, and MSF signals
Timezone override for flexible usage
NTP-based time accuracy when online
Background syncing when allowed by the device

Niche use-case with potentially limited audience
Very low recent activity (1 download in the last 30 days)
Paid app at $3.99 which may limit wider adoption

About SyncTime: JJY, WWVB & MSF

SyncTime: JJY, WWVB & MSF is a tools app developed by SWard Dev.

How many times has SyncTime: JJY, WWVB & MSF been downloaded?

SyncTime: JJY, WWVB & MSF has been downloaded 350 times. In the last 30 days, the app was downloaded 1 times.

What is the rating of SyncTime: JJY, WWVB & MSF?

SyncTime: JJY, WWVB & MSF is rated 4.91 out of 5 stars, based on 19 ratings.

Is SyncTime: JJY, WWVB & MSF free?

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.

What are the requirements for SyncTime: JJY, WWVB & MSF?

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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More data about SyncTime: JJY, WWVB & MSF

Price	$3.99
Total downloads	350
Recent downloads	1
Rating	4.91 based on 19 ratings
Ranking	Medium ranked
Version	10
APK size	14.8 MB
Number of libraries	?
Suitable for	Everyone
Ads	NO ads

App Performance Report

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Alternative downloads for the SyncTime: JJY, WWVB & MSF app

SyncTime: JJY, WWVB & MSF compared with similar apps

Common keywords of similar apps

Synctime Wwvb Msf Signals Jjy Controlled Syncing Supported Emulator Simulator Signal Station Silent Devices Speakers Select Set Time Watch Clock Radio Atomic Timezone City Sync Home

Keywords missing from this app

App World Screen Ntp Widget Analog Global Hour Display Accurate Recent Servers Features Accuracy Zones Phone Widgets Alarm Wear Os Place Clocks Countries Multiple Free Simple Zone Lock Application Exact Utc Face Converter Remote Experience Work Timer Version Internet Server Live

Google Play Rating history and histogram

Downloads over time

SyncTime: JJY, WWVB & MSF has been downloaded 350 times. Over the past 30 days, it has been downloaded 1 times.

Changelog of SyncTime: JJY, WWVB & MSF

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Developer information for SWard Dev

SWard Dev

swarddev@gmail.com

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Comments on SyncTime: JJY, WWVB & MSF for Android

★★★★☆ Danny Mann · Oct 7, 2022

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.

Google Play Rankings for SyncTime: JJY, WWVB & MSF

Top rankings

Rank	Country	Category	List
142	United States	Tools	Top Paid

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Ranking history in United States

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