# Twinkle Clock vs World Time Calc

The clearest difference is ads: Twinkle Clock at none against World Time Calc's shown. Twinkle Clock also leads on device support (4 vs 2). On price, update cadence, in-app purchases and iOS requirement there is nothing between them.

Both are free to download. Twinkle Clock sells 1 one-off in-app purchase and World Time Calc sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Twinkle Clock ships an update every 3 weeks, World Time Calc every 6 weeks. The most recent releases landed on October 27, 2026 and October 23, 2026 respectively.

## The numbers

| Metric | Twinkle Clock | World Time Calc |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/world-time-calc-time-converter/id6472414655/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | — | 66.7% of reviews |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 3 weeks** | Every 6 weeks |
| Monetization | — | Ad-supported |
| Size | 23 MB | 10 MB |
| Requires iOS | 17.0 | **16.0** |
| Devices | **iPhone, iPad, Mac, Vision Pro** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Hiroyasu Hirai](https://appshunter.io/developer/455568461) | [Hajime Suzuki](https://appshunter.io/developer/1615906018) |

## What reviewers say

### Twinkle Clock

[App page](https://appshunter.io/ios/app/twinkle-clock/id6467501688)

**Features:** iPhone Duo support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Twinkle Clock Pro | $24.99 | one-time |


### World Time Calc

[App page](https://appshunter.io/ios/app/world-time-calc-time-converter/id6472414655)

Visualize day/night cycles and working hours across different cities with an interactive timeline. Receive custom notifications for sunrise and sunset. Manually adjust work hours for precise scheduling.

**Highlights:** Day/night and working hour graphs, Automatic time updates, Manual work hour adjustment, Interactive time cursor, Sunrise/sunset alarm notifications

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| PremiumPlan | $7.99 | one-time |


## Frequently asked questions

### Is Twinkle Clock free?

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

### Is World Time Calc free?

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

### Do Twinkle Clock or World Time Calc have ads?

World Time Calc shows ads; Twinkle Clock does not.

### Which is updated more often, Twinkle Clock or World Time Calc?

Twinkle Clock ships an update every 3 weeks, and World Time Calc every 6 weeks. Most recently, Twinkle Clock was updated on October 27, 2026 and World Time Calc on October 23, 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.*