# World Clock vs SustEarn

The clearest difference is in-app purchases: SustEarn at none against World Clock's 1. SustEarn also leads on update cadence (every 10 days vs every 49 months) and iOS requirement (12.4 vs 17.6). On price, ads and device support there is nothing between them.

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

World Clock ships an update every 49 months, SustEarn every 10 days. The most recent releases landed on October 20, 2026 and October 27, 2026 respectively.

## The numbers

| Metric | World Clock | SustEarn |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[1.0 (1 ratings)](https://appshunter.io/ios/app/world-clock-time-zone/id1380617387/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 49 months | **Every 10 days** |
| Monetization | Free | — |
| Size | 20 MB | 41 MB |
| Requires iOS | 17.6 | **12.4** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Abdullah Saleem](https://appshunter.io/developer/1207008098) | [Harshit Kanodia](https://appshunter.io/developer/1456221091) |

## What reviewers say

### World Clock

[App page](https://appshunter.io/ios/app/world-clock-time-zone/id1380617387)

Easily track time across multiple locations with this multi-function world clock. It offers home screen widgets, custom time zones, and automatic location detection for convenient access to global time and dialing codes.

**Highlights:** Home screen widget, Custom time zones, Multiple clocks, Automatic location detection, Time zone information, Dialing codes

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Version | $3.99 | one-time |


### SustEarn

[App page](https://appshunter.io/ios/app/sustearn/id1666982947)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is World Clock free?

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

### Is SustEarn free?

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

### Do World Clock or SustEarn have ads?

Neither World Clock nor SustEarn shows ads.

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

World Clock ships an update every 49 months, and SustEarn every 10 days. Most recently, World Clock was updated on October 20, 2026 and SustEarn on October 27, 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.*