A radio wave for electric wave clocks (DCF77) is offered.
DCF77 Emulator by mokyuu recreates the DCF77 radio clock signal on Android, enabling time-sync experiments by using the device as a receiver. The app is free to use and leverages Google services (GCM, Firebase, AdMob) for notifications and monetization, backed by a solid rating from users. It isn’t ranked in any top list and has 50,000+ total downloads with 810 downloads in the last 30 days.
Pros & Cons
Free to use
Dedicated DCF77 clock signal emulation
GCM, Firebase, and AdMob integrations for a polished experience
Not ProGuarded for easier debugging
Experimental tool with no guaranteed operation
Requires a specific listening setup (headphone near the clock antenna) for best reception
Reception method may not reproduce atomic clock accuracy in all environments
About DCF77 Emulator
DCF77 Emulator is a productivity app developed by mokyuu.
Download Statistics
DCF77 Emulator has been downloaded 65 thousand times. In the last 30 days, the app was downloaded 810 times.
User Ratings
DCF77 Emulator is rated 4.44 out of 5 stars. The rating is based on 690 ratings.
App Information
DCF77 Emulator is FREE to download. The APK download size is 2.74 MB. The latest version available is 1.1.2. The last update was on July 4, 2025.
Technical Requirements
DCF77 Emulator requires Android 2.3+ or higher. The app has a content rating of Everyone. The app has been available on Google Play February 2019.
Description
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.
Get a detailed PDF report for DCF77 Emulator with download trends, rating history,
and key performance statistics — useful for competitive research or tracking your own app.
Learn more
Are you the developer of this app? Join us for free to see more information about your app and learn how we can help you promote and earn money with your app.
It simply works! I put my phone with max volume close to the clock which I want to sync, and after two minutes, voilà, it's synced
★★★★★Pete Bannigan· May 2, 2021
Worked as indicated in the instructions. On my Citizen watch, I cannot properly receive the DCF77 signal from Mainflingen. First I used an atomic clock app to verify that my phone time was set to NTP, it was showing lag of 1.494 seconds but by going to the date & time settings in the phone and toggling automatic time set off then on, the phone updated the time and the atomic clock app showed a lag of only 0.190 seconds, good enough! With a rooted phone, you can get apps that will automatically sync with NTP, but for uprooted phones you can only sync with your providers time (AFAIK).
★★★★★Den S· Dec 16, 2020
Samsung Galaxy S7 Edge, Casio GW-M5610. Middle volume on the speaker, watch in front of it on its side, gives L3 signal. Worked great.
★☆☆☆☆Nicu Irimia· Apr 4, 2022
Tried w a samsung phone on a watch and a clock. Nothing worked for me. It triggered receive indicator on the watch but failed to set time.
★☆☆☆☆Ricardo Cardeira· Apr 5, 2024
How can this be the dcf77 emulator if it uses the phone clock to make the synchronization?? Please! It's not any atomic sync, be aware!
★★☆☆☆Martin S· Oct 26, 2025
Stopped working on new Xiaomi 14t, app us ok, but dcf devices do not respond. Old phone was ok and synced the time successfully.
★★☆☆☆Siddharth Bhattacharya· Jan 10, 2022
The App needs to source time from NTP rather than using the Phone time as source. Time is always off by 1 - 2s. Get time from NTP time-servers, and it would rock ...
Google Play Rankings for DCF77 Emulator
This app is not ranked
Technologies used by DCF77 Emulator
DCF77 Emulator is requesting 9 permissions and is using 4 libraries.
Show details
Trust & Safety: The app requests network access, foreground service, wake lock, and AD_ID permissions, along with other ad/analytics-related permissions. No location permissions are listed. While these permissions enable ads and connectivity, users should consider privacy implications of ad identifiers and analytics data, and review the app’s use of these services. There is a note indicating experimental functionality and no guaranteed operation, which aligns with a cautious safety perspective.
Back to top
AppBrain Intelligence premium content
Subscribe now to get full and unlimited access to AppBrain Intelligence.
You'll have access to:
Each subscription will automatically renew 3 days before the expiration date for
the same time period. Subscriptions can be cancelled at any time before the renewal.
