Comparison

JJY Simulator vs CITIZEN Bluetooth Watch

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

JJY Simulator

This utility app simulates standard radio waves used by Japanese radio-controlled clocks. It outputs a 13.3kHz audio signal to synchronize your clock, allowing you to manually set the time.

Highlights
  • Simulates JJY standard radio waves
  • Outputs 13.3kHz audio signal
  • Synchronizes radio-controlled clocks
  • Uses 40kHz for time adjustment
  • Requires earphone connection
Features
Read full description

日本で市販されている電波時計をiPhoneで合わせるユーティリティです。 日本の電波時計の基準局(JJY)で使用される標準電波を模擬した信号を、13.3kHzの音声として出力し、3倍高調波(40kHz)を利用して時刻を合わせます。 1. イヤホンをiPhoneのイヤホンジャックに接続し、電波時計のすぐそばに置きます。 2. 音量を最大に設定します。 3. 「音声信号を出力」をオンにします。 4. 電波時計を強制受信モードにし、時刻が合うまで数分間待ちます。

About

CITIZEN Bluetooth Watch

This app connects your smartphone to compatible Bluetooth watches, offering automatic time synchronization, world time settings, and notifications for calls and messages. It also features alarm setting, a light level indicator for the watch's power, and tools to locate your smartphone or alert you if the connection is lost.

Highlights
  • Automatic time synchronization
  • World time settings
  • Call and message notifications
  • Alarm setting
  • Light level indicator
  • Smartphone search function
  • Link loss alert
Features
Read full description

*Important Notice Thank you for using Citizen products. As of 12/31/2027, we will no longer provide service for dedicated apps for some models and functions used in conjunction with the apps. For details, see this link. https://www.citizenwatch-global.com/support/im/smartwatch.html Overview This is the official app for linking your smartphone with CITIZEN Bluetooth watches (Bluetooth® version 4.0 or later). The app, which works with iPhone, enables you to set the time and the alarm for your watch, and to receive alerts for incoming calls, mails and texts. With CITIZEN Bluetooth Watch, you get to enjoy a handsome-looking analogue watch that tells the accurate time wherever you are plus the great convenience of a smartphone link. CITIZEN Bluetooth features CITIZEN’s proprietary light-powered technology Eco-Drive. Eco-Drive eliminates the need of periodic replacement of batteries or recharge via cable. Features 1. Time Sync Get the right time, all the time. When you connect with your smartphone, the time on your watch automatically updates to the current time (home time). 2. Local Time Get the time in any city around the world. Just touch the world map inside the app to set your watch to the time there (local time). 3. Call Notification Find out when you get a call. The watch emits a sound, vibrates or rotates the hands to let you know when you get a call. A filter function enables you to specify which callers will trigger alerts. 4. Message Notification Find out when you get a mail, text or SNS notification. The watch emits a sound, vibrates or rotates the hands to let you know when a new e-mail or SNS notification has arrived. You can select the apps for which you wish to receive alerts. 5. Alarm Set your alarm from your smartphone. Set your watch alarm using the smartphone app. The alarm can be set for different times for different days of the week. 6. Light Level Indicator See how much light—and power—your dial is getting. Find out how much power your watch is generating by tracking the light it’s exposed to on a daily, weekly or monthly basis. This unique function reflects CITIZEN’s status as a pioneer of light-powered technology. 7. Smartphone Search Find your smartphone easily. Mislaid your smartphone? Not a problem. Use your watch to locate your phone by getting it to emit a sound to indicate its whereabouts. (Range limitations apply.) 8. Link Loss Alert Get alerted when you’ve forgotten your smartphone somewhere. The watch emits a sound, vibrates or rotates the hands to let you know when the link between your smartphone and your watch is broken. This app requires iOS 9.3 or later. Optimized for iPhone 5 or greater. *Even if your smatphone is under the conditions above, there is no guarantee to use the dedicated app correctly on your smartphone. About Eco-Drive: Eco-Drive is a CITIZEN proprietary light-powered technology which eliminates the need of periodic replacement of batteries. Eco-Drive generates power from any kind of light—from sunlight to dim light—to drive the watch, and stores the surplus on a rechargeable cell. On a single full charge it can run for up to six months in total darkness*. For more details, click here. http://www.citizenwatch-global.com/technologies/index.html#eco-drive * Some models run for less than six months.

Screenshots

JJY Simulator2 screens
CITIZEN Bluetooth Watch4 screens

Verdict

The call

The clearest difference is review sentiment: JJY Simulator at 68% against CITIZEN Bluetooth Watch's 19%. JJY Simulator also leads on rating (4.2 vs 2.9) and iOS requirement (8.0 vs 15.6). CITIZEN Bluetooth Watch's advantage is update cadence (every 4 months vs every 66 months). On price, ratings volume, ads and in-app purchases there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

JJY Simulator holds the better App Store score, 4.2 against 2.9. Both are backed by a comparable volume of ratings — 19 and 12 respectively. Written reviews point the same way: 68% of JJY Simulator's written reviews are positive against 19% of CITIZEN Bluetooth Watch's.

UpkeepUpdate frequency

JJY Simulator ships an update every 66 months, CITIZEN Bluetooth Watch every 4 months. The most recent releases landed on October 23, 2026 and October 21, 2026 respectively.

Scorecard4 real differences · 6 level
JJY Simulator versus CITIZEN Bluetooth Watch: the parameters behind the verdict, then further details
ParameterJJY SimulatorCITIZEN Bluetooth Watch
PriceFreeFree
Rating4.2 (19 ratings) — better2.9 (12 ratings)
Positive reviews68.1% of reviews — better18.8% of reviews
Number of ratings19 — better12
Update frequencyEvery 66 monthsEvery 4 months — better
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPodiPhone, iPod
Requires iOS8.0 — better15.6
Further details — not scored
Size1 MB60 MB
Age rating4+4+
DeveloperNeoCatCITIZEN WATCH CO.,LTD

Customer experience

JJY Simulator

All ratings18 ratings
Positive72.2%
Neutral16.7%
Negative11.1%
Written reviews135 reviews
Positive68.1%
Neutral5.9%
Negative25.9%

CITIZEN Bluetooth Watch

All ratings11 ratings
Positive45.5%
Neutral9.1%
Negative45.5%
Written reviews69 reviews
Positive18.8%
Neutral10.1%
Negative71.0%

In-app purchases

None

JJY Simulator

No in-app purchases

None

CITIZEN Bluetooth Watch

No in-app purchases

Questions

Is JJY Simulator free?
JJY Simulator is free to download, with no in-app purchases.
Is CITIZEN Bluetooth Watch free?
CITIZEN Bluetooth Watch is free to download, with no in-app purchases.
Which has better reviews, JJY Simulator or CITIZEN Bluetooth Watch?
JJY Simulator is rated higher. JJY Simulator averages 4.2 out of 5 from 19 ratings, while CITIZEN Bluetooth Watch averages 2.9 from 12 ratings.
Do JJY Simulator or CITIZEN Bluetooth Watch have ads?
Neither JJY Simulator nor CITIZEN Bluetooth Watch shows ads.
Which is updated more often, JJY Simulator or CITIZEN Bluetooth Watch?
JJY Simulator ships an update every 66 months, and CITIZEN Bluetooth Watch every 4 months. Most recently, JJY Simulator was updated on October 23, 2026 and CITIZEN Bluetooth Watch on October 21, 2026.

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