# World Clock... vs CalenDue

The clearest difference is in-app purchases: CalenDue at none against World Clock...'s 2. CalenDue also leads on ads (none vs shown) and update cadence (daily vs monthly). On price, device support and iOS requirement there is nothing between them.

Both are free to download. World Clock... sells 2 in-app purchases, starting at $1.99 per month. CalenDue asks for nothing beyond the download.

World Clock... ships an update monthly, CalenDue daily. The most recent releases landed on October 3, 2026 and September 30, 2026 respectively.

## The numbers

| Metric | World Clock... | CalenDue |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Monthly | **Daily** |
| Size | 121 MB | 39 MB |
| Requires iOS | 16.0 | **15.1** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Olga Ivanova](https://appshunter.io/developer/1733570435) | [CalenDue Technologies](https://appshunter.io/developer/6800898894) |

## What reviewers say

### World Clock...

[App page](https://appshunter.io/ios/app/world-clock/id6751114970)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| timezones_by_oliva_subscription | $1.99 | per month |
| timezones_by_oliva_donation | $1.99 | one-time |


### CalenDue

[App page](https://appshunter.io/ios/app/calendue/id6771617813)

**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 CalenDue free?

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

### Do World Clock... or CalenDue have ads?

World Clock... shows ads; CalenDue does not.

### Which is updated more often, World Clock... or CalenDue?

World Clock... ships an update monthly, and CalenDue daily. Most recently, World Clock... was updated on October 3, 2026 and CalenDue on September 30, 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.*