# TT Clock vs World Clock

The clearest difference is ads: TT Clock at none against World Clock's shown. TT Clock also leads on iOS requirement (13.0 vs 16.0). On price, update cadence, in-app purchases and device support there is nothing between them.

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

TT Clock ships an update every 3 weeks, World Clock monthly. The most recent releases landed on October 28, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | TT Clock | World Clock |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | **Every 3 weeks** | Monthly |
| Size | 29 MB | 4 MB |
| Requires iOS | **13.0** | 16.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Shenzhen PROS Electronics Co.,Ltd](https://appshunter.io/developer/1798637623) | [Junpei Okumura](https://appshunter.io/developer/6773895881) |

## What reviewers say

### TT Clock

[App page](https://appshunter.io/ios/app/tt-clock/id6748670158)

**Features:** macOS Compatibility

**In-app purchases:** none


### World Clock

[App page](https://appshunter.io/ios/app/world-clock-time-zones/id6773895879)

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

**In-app purchases:** none


## Frequently asked questions

### Is TT Clock free?

TT Clock is free to download, with no in-app purchases.

### Is World Clock free?

World Clock is free to download, with no in-app purchases.

### Do TT Clock or World Clock have ads?

World Clock shows ads; TT Clock does not.

### Which is updated more often, TT Clock or World Clock?

TT Clock ships an update every 3 weeks, and World Clock monthly. Most recently, TT Clock was updated on October 28, 2026 and World Clock on October 24, 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.*