# Time Calibrator vs GMT Time

The clearest difference is rating: GMT Time at 4.7 against Time Calibrator's 2.7. GMT Time also leads on ratings volume (37 vs 3). Time Calibrator's advantage is ads (none vs shown) and monetization model (free vs ad-supported). On price, in-app purchases, device support and iOS requirement there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

GMT Time holds the better App Store score, 4.7 against 2.7. That said, the two scores are not equally well evidenced: GMT Time has 37 ratings behind it against 3, so its average is the more settled of the two.

## The numbers

| Metric | Time Calibrator | GMT Time |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.7 (3 ratings)](https://appshunter.io/ios/app/time-calibrator/id786988278/reviews) | **[4.7 (37 ratings)](https://appshunter.io/ios/app/gmt-time/id1613023691/reviews)** |
| Number of ratings | 3 | **37** |
| Positive reviews | 33.3% of reviews | — |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 8 months | — |
| Monetization | **Free** | Ad-supported |
| Size | 8 MB | 10 MB |
| Requires iOS | 15.6 | **14.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Atomtime Suisse S.A.](https://appshunter.io/developer/786988281) | [MingChun Chien](https://appshunter.io/developer/1181368598) |

## 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


### GMT Time

[App page](https://appshunter.io/ios/app/gmt-time/id1613023691)

This app provides accurate GMT time using NTP protocol and TrueTime framework. It offers a timekeeping function, allows setting time between two locations for itineraries, and supports multiple languages. Enjoy precise timekeeping with 1/100 second accuracy.

**Highlights:** Accurate GMT time display, NTP and TrueTime framework integration, Timekeeping function (on/off), Set time between two locations, Multi-language support (English, Japanese, Chinese, Cantonese), 1/100 second accuracy

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

**In-app purchases:** none


## Frequently asked questions

### Is Time Calibrator free?

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

### Is GMT Time free?

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

### Which has better reviews, Time Calibrator or GMT Time?

GMT Time is rated higher. Time Calibrator averages 2.7 out of 5 from 3 ratings, while GMT Time averages 4.7 from 37 ratings.

### Do Time Calibrator or GMT Time have ads?

GMT Time shows ads; Time Calibrator does not.

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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.*