A radio wave for electric wave clocks (DCF77) is offered.
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 64 thousand times. In the last 30 days, the app was downloaded 800 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.
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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
★★★★★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.
★★★★★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).
★★☆☆☆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 ...
★☆☆☆☆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.
★★☆☆☆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.
★☆☆☆☆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!
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 5 libraries.
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.
AdMob
Android Jetpack core
Firebase
Google Cloud Messaging (GCM)