# JJY Simulator vs CITIZEN Bluetooth Watch

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.

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

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.

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.

## The numbers

| Metric | JJY Simulator | CITIZEN Bluetooth Watch |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.2 (19 ratings)](https://appshunter.io/ios/app/jjy-simulator/id431054911/reviews)** | [2.9 (12 ratings)](https://appshunter.io/ios/app/citizen-bluetooth-watch/id1068381349/reviews) |
| Number of ratings | **19** | 12 |
| Positive reviews | **68.1% of reviews** | 18.8% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 66 months | **Every 4 months** |
| Monetization | Free | Free |
| Size | 1 MB | 60 MB |
| Requires iOS | **8.0** | 15.6 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [NeoCat](https://appshunter.io/developer/431054914) | [CITIZEN WATCH CO.,LTD](https://appshunter.io/developer/434806605) |

## What reviewers say

### JJY Simulator

[App page](https://appshunter.io/ios/app/jjy-simulator/id431054911)

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:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### CITIZEN Bluetooth Watch

[App page](https://appshunter.io/ios/app/citizen-bluetooth-watch/id1068381349)

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:** macOS Compatibility

**In-app purchases:** none


## Frequently asked 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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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*