# ITOS Self3 vs GMT Time

The clearest difference is in-app purchases: ITOS Self3 at none against GMT Time's 1. ITOS Self3 also leads on ads (none vs shown) and update cadence (every 3 months vs every 28 months). On price and device support there is nothing between them.

Both are free to download. GMT Time sells 1 one-off in-app purchase. ITOS Self3 asks for nothing beyond the download.

ITOS Self3 ships an update every 3 months, GMT Time every 28 months. The most recent releases landed on November 6, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | ITOS Self3 | GMT Time |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.7 (38 ratings)](https://appshunter.io/ios/app/gmt-time/id1613023691/reviews)** |
| Number of ratings | — | **38** |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 3 months** | Every 28 months |
| Monetization | — | Ad-supported |
| Size | 15 MB | 26 MB |
| Requires iOS | **11.0** | 17.0 |
| Devices | iPad | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [ITOS Inc](https://appshunter.io/developer/931339182) | [MingChun Chien](https://appshunter.io/developer/1181368598) |

## What reviewers say

### ITOS Self3

[App page](https://appshunter.io/ios/app/itos-self3/id1163101659)

**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, iPhone Duo support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Time117 Pro | $0.99 | one-time |


## Frequently asked questions

### Is ITOS Self3 free?

ITOS Self3 is free to download, with no in-app purchases.

### Is GMT Time free?

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

### Do ITOS Self3 or GMT Time have ads?

GMT Time shows ads; ITOS Self3 does not.

### Which is updated more often, ITOS Self3 or GMT Time?

ITOS Self3 ships an update every 3 months, and GMT Time every 28 months. Most recently, ITOS Self3 was updated on November 6, 2026 and GMT Time on November 3, 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.*