Radio Wave Sync vs Twelve O'clock
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Radio Wave Sync
This app helps synchronize radio-controlled watches by simulating time signal waves. It supports various international time signal standards and offers a 'Beast Mode' for faster synchronization. Simply place your watch near your device's speaker and start the process.
- Simulates international time wave signals
- Supports China, USA, Japan, Germany, and UK signals
- Unique 'Beast Mode' for faster sync
- Manual wave receiving mode calibration
- Adjustable volume for optimal signal
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I have a Casio G-Series radio watch, but it is always unable to receive radio waves from time signal station, so I started to write an application to solve this problem. After some research, I finally wrote this application, which can perfectly simulate the timing signal and happily calibrate the time. Usage method: 1. Adjust the volume of iPhone / iPad to the maximum. 2. Switch the radio controlled watch / clock to manual wave receiving mode. 3. Click the "start" button. 4. Place the watch / clock near the iPhone / iPad speakers. 5. The synchronization process generally takes 3-10 minutes, please wait patiently. Matters needing attention: 1. Please try to use the software in a quiet environment to avoid signal interference. 2. The volume of the mobile phone must be adjusted to the maximum. It's too small and the effect is not good. Characteristic: 1. Supports simulation of all types of Time Wave Signal: * China BPC * USA WWVB * Japan JJY40 / JJY60 * Germany DCF77 * British MSF 2. The unique "Beast Mode" provides higher frequency simulation signals and faster sync. Contact information: Please contact me if you have any use questions *QQ: 3364918353 *Email: 3364918353@qq.com
Twelve O'clock
Easily track the accuracy of your mechanical watches over time. Manually log checkpoints to calculate seconds per day and visualize performance with charts. Manage your watch collection with photos and learn more about horology.
- Manage watch collection
- Add/edit/remove watches
- Include watch photos
- Track watch accuracy
- Calculate seconds per day
- View accuracy charts
- Horology content
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Twelve O’clock is an app that helps track your watch accuracy easily in a realistic way. I can’t stress this enough: it’s “tracking”, not measuring instantaneous accuracy like a timegrapher device. It’s a manual and oldschool job but it brings so much fun. It reminds me of the old days when I had to synchronize my watch to the clock on the TV at 7pm every day. With Twelve O'clock you can: ** MANAGE YOUR WATCH COLLECTION * Add, edit, remove any item in a list of your watch collection * Include a nice wristshot of each watch ** KNOW YOUR WATCH ACCURACY * Simply add some checkpoints and let the app calculate the accuracy in *second per day* * A nice chart of the accuracy over the time ** LEARN MORE ABOUT HOROLOGY * Curated content for watch lovers (like me)
Screenshots
Verdict
The clearest difference is ads: Twelve O'clock at none against Radio Wave Sync's shown. Twelve O'clock also leads on review sentiment (91% vs 61%) and update cadence (every 3 weeks vs every 2 months). Radio Wave Sync's advantage is ratings volume (1.1K vs 83) and iOS requirement (13.0 vs 15.0). On price, rating, in-app purchases and monetization model 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
Both are free to download. Radio Wave Sync sells 1 one-off in-app purchase and Twelve O'clock sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.
On the App Store both sit at effectively the same score — 4.5 for Radio Wave Sync against 4.4 for Twelve O'clock. That said, the two scores are not equally well evidenced: Radio Wave Sync has 1.1K ratings behind it against 83, so its average is the more settled of the two. Written reviews are what separate them: 61% of Radio Wave Sync's written reviews are positive against 91% of Twelve O'clock's.
Radio Wave Sync ships an update every 2 months, Twelve O'clock every 3 weeks. The most recent releases landed on October 20, 2026 and October 21, 2026 respectively.
| Parameter | Radio Wave Sync | Twelve O'clock |
|---|---|---|
| Price | Free | Free |
| Rating | 4.5 (1.1K ratings) — better | 4.4 (83 ratings) |
| Positive reviews | 61.5% of reviews | 91.1% of reviews — better |
| Number of ratings | 1.1K — better | 83 |
| Update frequency | Every 2 months | Every 3 weeks — better |
| Ads | Yes | No — better |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 13.0 — better | 15.0 |
| Further details — not scored | ||
| Size | 15 MB | 46 MB |
| Age rating | 4+ | 4+ |
| Developer | 宁 金 | Hieu Pham |
Customer experience
Radio Wave Sync
Twelve O'clock
User reviews
Radio Wave Sync
From 1.1K App Store ratingsWhat we love
- 🚀 Works as intended
- 👍 Easy to use
- 💡 Innovative solution
- 🔒 Reliable sync
- ⏱️ Fast sync time
Room to improve
- 🐛 Inconsistent performance
- 💰 Paid version required
- 🔇 Audio issues
- 🤖 Ads in paid version
- 🔁 One-time use only
Twelve O'clock
From 83 App Store ratingsWhat we love
- 👍 Intuitive and simple user interface
- 💰 Excellent value at $0.99 one-time purchase
- 🎯 Accurate watch accuracy tracking
- ⏱️ Flexible checkpoint timing (0, 15, 30, 45 seconds)
- 📊 Clear data visualization and graphs
Room to improve
- 🐛 App freezes and crashes frequently
- 💾 Data loss after updates
- ⚠️ Free version severely limited (5 checkpoints only)
- 🔔 Silent mode prevents beeping sounds
- 🎯 Requires learning curve for some users
Bugs and requests
Radio Wave Sync
Reported bugs
3 issues- No sound output
- Sync failure after initial success
- Incompatibility with certain watch models
Requested features
3 requests- Time zone offset option
- Compatibility with newer devices
- Improved reliability and consistency
Twelve O'clock
Reported bugs
11 issues- App freezes at loading requiring phone restart
- Data deletion after app updates
- Data loss on app crash
- Graph display glitches after checkpoints
- Photo checkpoint feature returns 'old photo not supported' error
Show 6 moreShow fewer
- Beeping only works when phone not in silent mode
- Sort function not working
- Screenshot sharing produces blank page
- Calculation errors showing ~150 second variance
- Checkpoint history doesn't display correctly
- Swiping left to delete checkpoints not intuitive
Requested features
18 requests- iCloud/cloud synchronization across devices
- Notifications or reminders for checkpoints
- Current time button on checkpoint screen
- Larger buttons for 15/30/45 second marks
- Power reserve tracking
Show 13 moreShow fewer
- Wear frequency tracking
- Average accuracy by watch position
- Widget support
- Atomic clock built into app
- Regulator clock layout for time setting
- In-app feedback option (instead of Twitter)
- Automatic time reading from watch photos
- 12-hour time format option
- Sort function improvements
- Year display in checkpoint history
- Chrono24 account integration
- Regular article updates
- Export to Excel/CSV
In-app purchases
Radio Wave Sync
- Pro Editon$1.99
Twelve O'clock
- Twelve Plus$1.99
Questions
Is Radio Wave Sync free?
Is Twelve O'clock free?
Which has better reviews, Radio Wave Sync or Twelve O'clock?
Do Radio Wave Sync or Twelve O'clock have ads?
Which is updated more often, Radio Wave Sync or Twelve O'clock?
Other comparisons
