# AtomicClock vs Radio Wave Sync

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.

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.

## The numbers

| Metric | AtomicClock | Radio Wave Sync |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (5.5K ratings)](https://appshunter.io/ios/app/atomicclock-ntp-time/id1402993049/reviews)** | [4.5 (1K ratings)](https://appshunter.io/ios/app/radio-wave-sync/id1484233572/reviews) |
| Number of ratings | **5.5K** | 1K |
| Positive reviews | **84.2% of reviews** | 61.5% of reviews |
| In-app purchases | Yes | Yes |
| Ads | Yes | Yes |
| Update frequency | **Every 3 weeks** | Every 2 months |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 17 MB | 15 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Timo Partl](https://appshunter.io/developer/1387413672) | [宁 金](https://appshunter.io/developer/1085058605) |

## What reviewers say

### AtomicClock

[App page](https://appshunter.io/ios/app/atomicclock-ntp-time/id1402993049)

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.

**Highlights:** 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

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Lifetime Pro Version | $6.99 | one-time |

**What reviewers like**

- 🚀 Accurate time
- 👍 Highly customizable
- 🚀 Precise to the second
- 👍 Easy to use
- 👍 Helpful for setting watches

**What reviewers complain about**

- 🐛 Server connection issues
- 🔍 Limited time zone options
- 💰 Ads diminish clock view
- 🔍 Lacks some advanced features
- 🔍 Redundant for some users

**Reported bugs**

- Crashes on certain iOS versions
- Occasional freezing of hands
- Countdown timer sound not working

**Requested features**

- 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

[App page](https://appshunter.io/ios/app/radio-wave-sync/id1484233572)

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.

**Highlights:** 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

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Editon | $1.99 | one-time |

**What reviewers like**

- 🚀 Works as intended
- 👍 Easy to use
- 💡 Innovative solution
- 🔒 Reliable sync
- ⏱️ Fast sync time

**What reviewers complain about**

- 🐛 Inconsistent performance
- 💰 Paid version required
- 🔇 Audio issues
- 🤖 Ads in paid version
- 🔁 One-time use only

**Reported bugs**

- No sound output
- Sync failure after initial success
- Incompatibility with certain watch models

**Requested features**

- Time zone offset option
- Compatibility with newer devices
- Improved reliability and consistency


## Frequently asked questions

### Is AtomicClock free?

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

### Is Radio Wave Sync free?

Radio Wave Sync is free to download, with in-app purchases available.

### Which has better reviews, AtomicClock or Radio Wave Sync?

AtomicClock is rated higher. AtomicClock averages 4.8 out of 5 from 5.5K ratings, while Radio Wave Sync averages 4.5 from 1K ratings.

### Do AtomicClock or Radio Wave Sync have ads?

Both AtomicClock and Radio Wave Sync show ads.

### Which is updated more often, AtomicClock or Radio Wave Sync?

AtomicClock ships an update every 3 weeks, and Radio Wave Sync every 2 months. Most recently, AtomicClock was updated on October 17, 2026 and Radio Wave Sync on October 18, 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.*