# Units and Metrics vs World Clock

The clearest difference is in-app purchases: Units and Metrics at none against World Clock's 1. Units and Metrics also leads on device support (3 vs 1) and iOS requirement (14.0 vs 17.6). On price, update cadence and ads there is nothing between them.

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

Units and Metrics ships an update every 2 weeks, World Clock fortnightly. The most recent releases landed on October 19, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | Units and Metrics | World Clock |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 weeks | **Fortnightly** |
| Monetization | Free | — |
| Size | 20 MB | 2 MB |
| Requires iOS | **14.0** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Reno Softwares](https://appshunter.io/developer/1778003915) | [Mehmet Erdem Devge](https://appshunter.io/developer/1464750482) |

## What reviewers say

### Units and Metrics

[App page](https://appshunter.io/ios/app/units-and-metrics/id6737802252)

This app provides instant unit conversions across a wide range of categories, including everyday measurements and specialized fields. It features an offline mode, the ability to save favorite conversions, and a customizable interface with light and dark themes. Users can also manage their conversion history.

**Highlights:** Real-time conversions, Offline mode, Save favorite conversions, Customizable themes, Conversion history management, Comprehensive categories

**Features:** macOS Compatibility

**In-app purchases:** none


### World Clock

[App page](https://appshunter.io/ios/app/world-clock-time-zone-tracker/id6738009591)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Features- Lifetime | $1.99 | one-time |


## Frequently asked questions

### Is Units and Metrics free?

Units and Metrics is free to download, with no in-app purchases.

### Is World Clock free?

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

### Do Units and Metrics or World Clock have ads?

Neither Units and Metrics nor World Clock shows ads.

### Which is updated more often, Units and Metrics or World Clock?

Units and Metrics ships an update every 2 weeks, and World Clock fortnightly. Most recently, Units and Metrics was updated on October 19, 2026 and World Clock on October 13, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*