# JJY Simulator vs TimeWave

The clearest difference is review sentiment: JJY Simulator at 60% against TimeWave's 0%. JJY Simulator also leads on in-app purchases (none vs 2) and iOS requirement (8.0 vs 15.0). TimeWave's advantage is update cadence (weekly vs every 66 months) and rating (4.4 vs 4.2). On price, ratings volume, ads and monetization model there is nothing between them.

Both are free to download. TimeWave sells 2 one-off in-app purchases. JJY Simulator asks for nothing beyond the download.

TimeWave holds the better App Store score, 4.4 against 4.2. Both are backed by a comparable volume of ratings — 18 and 18 respectively. Written reviews complicate that: 60% of JJY Simulator's written reviews are positive against 0% of TimeWave's, so the app with the better star average is not the one people write more warmly about.

JJY Simulator ships an update every 66 months, TimeWave weekly. The most recent releases landed on October 7, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | JJY Simulator | TimeWave |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.2 (18 ratings)](https://appshunter.io/ios/app/jjy-simulator/id431054911/reviews) | **[4.4 (18 ratings)](https://appshunter.io/ios/app/timewave-atomic-watch-sync/id6779167516/reviews)** |
| Number of ratings | 18 | 18 |
| Positive reviews | **60.0% of reviews** | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 66 months | **Weekly** |
| Monetization | Free | Free |
| Size | 1 MB | 3 MB |
| Requires iOS | **8.0** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [NeoCat](https://appshunter.io/developer/431054914) | [毅 何](https://appshunter.io/developer/1477138542) |

## 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


### TimeWave

[App page](https://appshunter.io/ios/app/timewave-atomic-watch-sync/id6779167516)

This app simulates radio-controlled clock signals to help your watch synchronize its time when terrestrial signals are unavailable. It offers guides for popular watch brands and checks environmental conditions before transmission.

**Highlights:** Radio-controlled clock signal simulation, Support for multiple international time signals, Environment pre-check and recommendations, Smart output tuning for various audio paths, Local time mode for overseas watches, Watch-specific synchronization guides, Live signal visualization and sync history

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Buy Me a Coffee | $0.99 | one-time |
| Lifetime Membership | $3.99 | one-time |


## Frequently asked questions

### Is JJY Simulator free?

JJY Simulator is free to download, with no in-app purchases.

### Is TimeWave free?

TimeWave is free to download, with in-app purchases available.

### Which has better reviews, JJY Simulator or TimeWave?

TimeWave is rated higher. JJY Simulator averages 4.2 out of 5 from 18 ratings, while TimeWave averages 4.4 from 18 ratings.

### Do JJY Simulator or TimeWave have ads?

Neither JJY Simulator nor TimeWave shows ads.

### Which is updated more often, JJY Simulator or TimeWave?

JJY Simulator ships an update every 66 months, and TimeWave weekly. Most recently, JJY Simulator was updated on October 7, 2026 and TimeWave on October 8, 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.*