DCF77 Emulator

Name: DCF77 Emulator
Rating: 4.4375 (724 reviews)
Author: mokyuu

By: mokyuu

A radio wave for electric wave clocks (DCF77) is offered.

Features & Capabilities

The DCF77 Emulator is a handy Chrome extension designed to simulate the DCF77 radio wave signals used by electric wave clocks. This tool helps users sync their clocks by placing their device's speaker close to the clock's internal antenna, playing the simulated signal at an optimal volume.

Please note that this emulator does not connect to atomic clocks and requires manual time adjustments using other apps. Its main function is to offer a test environment for radio-controlled clocks without access to real DCF77 signals. Ideal for hobbyists and developers needing a radio wave simulator, the extension offers sync times within 2 to 3 minutes when set up correctly.

User Growth & Download Statistics

App

By:

mokyuu

Downloads:

64,618 191

Rating:

4.44

(724) 1 ratings

Version:

1.1.2 Last updated: 2025-07-04

Version code:

Creation date:

2019-02-14

Publisher country:

Permissions:

com.google.android.gms.permission.AD_ID Moderate risk
android.permission.ACCESS_ADSERVICES_AD_ID Low risk
android.permission.ACCESS_ADSERVICES_ATTRIBUTION Low risk
android.permission.ACCESS_ADSERVICES_TOPICS Low risk
android.permission.FOREGROUND_SERVICE Low risk
android.permission.INTERNET Low risk
android.permission.WAKE_LOCK Low risk
android.permission.ACCESS_NETWORK_STATE Safe
jp.houryo.dcf77emulator.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION

Size:

4.82MB

Email:

mo*****@outlook.com

URLs:

Website ,Privacy policy

Full description:

Source:

Google Play Store

Data ingested on:

2026-06-08

Compare stats and ranking:

Ranking

# 261,260 ▼ 757

For Developers

Monetize with App Pass Boost with Extension Booster

Contact the developer

Chrome-Stats does not own this Android app. Please use these information below to contact the Android app developer.

Developed by:

mokyuu

Google Play Store

https://play.google.com/store/apps/details?id=jp.houryo.dcf77emulator

Email:

mo*****@outlook.com

Website:

http://mokyu.sakura.ne.jp

User Reviews

Users consistently praise DCF77 Emulator for effectively synchronizing atomic clocks and watches indoors where real radio signals can't reach. Most find it works well using just a phone's internal speaker at high volume with proper placement. However, synchronization reliability varies, and some users must experiment with positioning or external speakers. A few clocks don't always set correctly despite signal reception. Overall, it's a powerful tool for enthusiasts to sync multiple DCF77 devices, with responsive developer support and ongoing improvements.

Pros

The app successfully synchronizes DCF77 clocks and watches even in areas with poor or no actual DCF77 radio signal reception.
Works well without needing headphones; using phone speakers at maximum volume is effective.
Many users found that placing the phone speaker close to the clock/watch and adjusting orientation leads to successful synchronization.
Helpful for setting clocks that cannot receive the real DCF77 from the tower, allowing indoor synchronization.
Developer is responsive; recent updates fixed previous issues quickly.

Cons

Some users experienced inconsistent or unreliable synchronization, requiring trial and error with phone positioning or external aids like a USB cable or Bluetooth speaker.
The app may not always work with every device or clock model, with some users reporting failure to set time despite triggering receive indicators.
Requires manual adjustment and experimentation with volume, placement, and orientation for optimal performance, which can be a challenge.
Lacks an easy way to input time offsets or timezones beyond presets, limiting usability in some regions.