AtomicClock vs Radio Wave Sync
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
AtomicClock
This app displays the exact current time synchronized with NTP servers, offering a customizable clock view for precise time checks. It's ideal for setting watches, verifying timestamps, or comparing local and network time.
- Precise time from NTP servers
- Customizable clock faces
- Select or add time servers
- Local and UTC views
- 12/24 hour modes
- Customizable time format
- Acoustic ticking
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Check precise NTP reference time at a glance. AtomicClock helps you set watches, wall clocks, cameras, and other devices, compare local time with UTC, and follow moments when every second matters. Clear analog and digital time AtomicClock displays current time from NTP servers that reference atomic clocks. Choose a predefined server or add your own, then view local or UTC time in a clean analog or digital clock. Customize your reference clock • Switch between 12-hour and 24-hour time • Customize the time format • Choose from multiple clock faces and hands • Use a smooth, fluid second hand • Add acoustic ticking or the Greenwich Time Signal • Tap the screen to hide information and controls, freeze the display, or mute ticking Details for precise time checks View technical NTP information, including round-trip time and server stratum. Whether you are checking a timestamp, preparing a camera, aligning a wall clock, or setting a watch by hand, the seconds remain clear and easy to follow. AtomicClock is free to use. AtomicClock Pro is available as a one-time purchase with no subscription. It unlocks your preferred clock face, hands, and font, removes ads, and includes upcoming Pro features. AtomicClock displays NTP reference time for comparison and does not change your device’s system time. Results can vary with the selected server, network conditions, and device behavior.
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
Screenshots
Verdict
The clearest difference is review sentiment: AtomicClock at 84% against Radio Wave Sync's 61%. AtomicClock also leads on rating (4.8 vs 4.5) and update cadence (every 3 weeks vs every 2 months). Radio Wave Sync's advantage is iOS requirement (13.0 vs 15.0). On price, ads, 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. AtomicClock sells 1 one-off in-app purchase and Radio Wave Sync sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.
AtomicClock holds the better App Store score, 4.8 against 4.5. That said, the two scores are not equally well evidenced: AtomicClock has 5.5K ratings behind it against 1K, so its average is the more settled of the two. Written reviews point the same way: 84% of AtomicClock's written reviews are positive against 61% of Radio Wave Sync's.
AtomicClock ships an update every 3 weeks, Radio Wave Sync every 2 months. The most recent releases landed on October 17, 2026 and October 18, 2026 respectively.
| Parameter | AtomicClock | Radio Wave Sync |
|---|---|---|
| Price | Free | Free |
| Rating | 4.8 (5.5K ratings) — better | 4.5 (1K ratings) |
| Positive reviews | 84.2% of reviews — better | 61.5% of reviews |
| Number of ratings | 5.5K — better | 1K |
| Update frequency | Every 3 weeks — better | Every 2 months |
| Ads | Yes | Yes |
| 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 | 15.0 | 13.0 — better |
| Further details — not scored | ||
| Size | 17 MB | 15 MB |
| Age rating | 4+ | 4+ |
| Developer | Timo Partl | 宁 金 |
Customer experience
AtomicClock
Radio Wave Sync
User reviews
AtomicClock
From 5.5K App Store ratingsWhat we love
- 🚀 Accurate time
- 👍 Highly customizable
- 🚀 Precise to the second
- 👍 Easy to use
- 👍 Helpful for setting watches
Room to improve
- 🐛 Server connection issues
- 🔍 Limited time zone options
- 💰 Ads diminish clock view
- 🔍 Lacks some advanced features
- 🔍 Redundant for some users
Radio Wave Sync
From 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
Bugs and requests
AtomicClock
Reported bugs
3 issues- Crashes on certain iOS versions
- Occasional freezing of hands
- Countdown timer sound not working
Requested features
5 requests- Add GMT/dual time display
- Implement widget support
- Add different second hand sounds
- Allow setting background color to match watch
- Include alarm/timer functionality
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
In-app purchases
AtomicClock
- Lifetime Pro Version$6.99
Radio Wave Sync
- Pro Editon$1.99
Questions
Is AtomicClock free?
Is Radio Wave Sync free?
Which has better reviews, AtomicClock or Radio Wave Sync?
Do AtomicClock or Radio Wave Sync have ads?
Which is updated more often, AtomicClock or Radio Wave Sync?
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