# Time Calibrator vs Radio Wave Sync

The clearest difference is rating: Radio Wave Sync at 4.5 against Time Calibrator's 2.7. Radio Wave Sync also leads on review sentiment (61% vs 33%) and ratings volume (1.1K vs 3). Time Calibrator's advantage is in-app purchases (none vs 1) and ads (none vs shown). On price and device support there is nothing between them.

Both are free to download. Radio Wave Sync sells 1 one-off in-app purchase. Time Calibrator asks for nothing beyond the download.

Radio Wave Sync holds the better App Store score, 4.5 against 2.7. That said, the two scores are not equally well evidenced: Radio Wave Sync has 1.1K ratings behind it against 3, so its average is the more settled of the two. Written reviews point the same way: 33% of Time Calibrator's written reviews are positive against 61% of Radio Wave Sync's.

Time Calibrator ships an update every 8 months, Radio Wave Sync every 2 months. The most recent releases landed on November 1, 2026 and November 7, 2026 respectively.

## The numbers

| Metric | Time Calibrator | Radio Wave Sync |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.7 (3 ratings)](https://appshunter.io/ios/app/time-calibrator/id786988278/reviews) | **[4.5 (1.1K ratings)](https://appshunter.io/ios/app/radio-wave-sync/id1484233572/reviews)** |
| Number of ratings | 3 | **1.1K** |
| Positive reviews | 33.3% of reviews | **61.4% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 8 months | **Every 2 months** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 8 MB | 15 MB |
| Requires iOS | 15.6 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Atomtime Suisse S.A.](https://appshunter.io/developer/786988281) | [Kunshan Nianyueri Information Technology Co., Ltd.](https://appshunter.io/developer/1085058605) |

## What reviewers say

### Time Calibrator

[App page](https://appshunter.io/ios/app/time-calibrator/id786988278)

This utility app provides precise local time and date information by connecting to an atomic clock server in Switzerland. It utilizes quantum technology to transmit this data at the speed of light directly to compatible i-Atomic watches.

**Highlights:** Accurate global time and date, Connects to Swiss atomic clock server, Quantum technology data transmission, Direct communication to i-Atomic watches, Light signal synchronization

**Features:** macOS Compatibility

**In-app purchases:** none


### 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 Time Calibrator free?

Time Calibrator is free to download, with no in-app purchases.

### Is Radio Wave Sync free?

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

### Which has better reviews, Time Calibrator or Radio Wave Sync?

Radio Wave Sync is rated higher. Time Calibrator averages 2.7 out of 5 from 3 ratings, while Radio Wave Sync averages 4.5 from 1.1K ratings.

### Do Time Calibrator or Radio Wave Sync have ads?

Radio Wave Sync shows ads; Time Calibrator does not.

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

Time Calibrator ships an update every 8 months, and Radio Wave Sync every 2 months. Most recently, Time Calibrator was updated on November 1, 2026 and Radio Wave Sync on November 7, 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.*