# World Time Calc vs CheckTimeYo

The clearest difference is in-app purchases: CheckTimeYo at none against World Time Calc's 1. CheckTimeYo also leads on ads (none vs shown). On price, update cadence, device support and iOS requirement there is nothing between them.

Both are free to download. World Time Calc sells 1 one-off in-app purchase. CheckTimeYo asks for nothing beyond the download.

Both ship on a similar rhythm, roughly every 6 weeks. The most recent releases landed on July 9, 2026 and December 2, 2025 respectively.

## The numbers

| Metric | World Time Calc | CheckTimeYo |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 66.7% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 6 weeks | Every 6 weeks |
| Monetization | Ad-supported | — |
| Size | 10 MB | 12 MB |
| Requires iOS | **16.0** | 17.4 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Hajime Suzuki](https://appshunter.io/developer/1615906018) | [Masayoshi Ueda](https://appshunter.io/developer/1688525453) |

## What reviewers say

### 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 |


### CheckTimeYo

[App page](https://appshunter.io/ios/app/checktimeyo/id6504262821)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is World Time Calc free?

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

### Is CheckTimeYo free?

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

### Do World Time Calc or CheckTimeYo have ads?

World Time Calc shows ads; CheckTimeYo does not.

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

World Time Calc ships an update every 6 weeks, and CheckTimeYo every 6 weeks. Most recently, World Time Calc was updated on July 9, 2026 and CheckTimeYo on December 2, 2025.

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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.*