# World Clock vs Universal Unit Converter!

The clearest difference is in-app purchases: Universal Unit Converter! at none against World Clock's 1. Universal Unit Converter! also leads on update cadence (weekly vs every 6 weeks). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. World Clock sells 1 one-off in-app purchase. Universal Unit Converter! asks for nothing beyond the download.

World Clock ships an update every 6 weeks, Universal Unit Converter! weekly. The most recent releases landed on June 9, 2026 and September 16, 2026 respectively.

## The numbers

| Metric | World Clock | Universal Unit Converter! |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.9 (14 ratings)](https://appshunter.io/ios/app/world-clock-time-converter/id622366157/reviews)** | — |
| Number of ratings | **14** | — |
| Positive reviews | 77.4% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | Yes |
| Update frequency | Every 6 weeks | **Weekly** |
| Monetization | Ad-supported | — |
| Size | 6 MB | 41 MB |
| Requires iOS | 15.6 | **15.0** |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Yuki Fukui](https://appshunter.io/developer/575924491) | [Taek Oh](https://appshunter.io/developer/1616205954) |

## What reviewers say

### World Clock

[App page](https://appshunter.io/ios/app/world-clock-time-converter/id622366157)

Easily calculate time differences worldwide by scrolling a dynamic time bar. Add any city, set specific dates and times, and plan international meetings or calls effortlessly. The app syncs with iOS time data.

**Highlights:** Dynamic time bar for instant difference calculation, Add and manage multiple cities, Direct date and time specification, Customizable city names, Syncs with iOS time data

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Advertisement | $1.99 | one-time |


### Universal Unit Converter!

[App page](https://appshunter.io/ios/app/universal-unit-converter/id6785926049)

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

**In-app purchases:** none


## Frequently asked questions

### Is World Clock free?

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

### Is Universal Unit Converter! free?

Universal Unit Converter! is free to download, with no in-app purchases.

### Do World Clock or Universal Unit Converter! have ads?

Both World Clock and Universal Unit Converter! show ads.

### Which is updated more often, World Clock or Universal Unit Converter!?

World Clock ships an update every 6 weeks, and Universal Unit Converter! weekly. Most recently, World Clock was updated on June 9, 2026 and Universal Unit Converter! on September 16, 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.*