# Metric Converters vs CatKey

The clearest difference is price: CatKey at Free against Metric Converters's $0.99. CatKey also leads on update cadence (every 2 months vs every 38 months). Metric Converters's advantage is in-app purchases (none vs 1) and iOS requirement (14.1 vs 17). On ads and device support there is nothing between them.

CatKey is free to download; Metric Converters costs $0.99 up front. CatKey sells 1 one-off in-app purchase. Metric Converters asks for nothing beyond the download.

Metric Converters ships an update every 38 months, CatKey every 2 months. The most recent releases landed on October 23, 2026 and October 21, 2026 respectively.

## The numbers

| Metric | Metric Converters | CatKey |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | — | **[1.0 (1 ratings)](https://appshunter.io/ios/app/catkey/id6784041022/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 38 months | **Every 2 months** |
| Monetization | — | Free with in-app purchases |
| Size | 20 MB | 4 MB |
| Requires iOS | **14.1** | 17 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | +4 | 4+ |
| Developer | [H Valeur](https://appshunter.io/developer/621824042) | [贺 周](https://appshunter.io/developer/1815397078) |

## What reviewers say

### Metric Converters

[App page](https://appshunter.io/ios/app/metric-converters/id1570182170)

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

**In-app purchases:** none


### CatKey

[App page](https://appshunter.io/ios/app/catkey/id6784041022)

This keyboard app provides dedicated Catalan language support, including spell checking and autocorrect, which were removed from iOS. It offers a seamless bilingual experience with Spanish and includes customizable features for a better typing experience.

**Highlights:** Catalan spell checking, Autocorrect for Catalan, Word prediction, Bilingual switching, Customizable keyboard height, Offline functionality, Theme customization

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

**In-app purchases (1)**

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


## Frequently asked questions

### Is Metric Converters free?

Metric Converters costs $0.99, with no in-app purchases.

### Is CatKey free?

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

### Do Metric Converters or CatKey have ads?

Neither Metric Converters nor CatKey shows ads.

### Which is updated more often, Metric Converters or CatKey?

Metric Converters ships an update every 38 months, and CatKey every 2 months. Most recently, Metric Converters was updated on October 23, 2026 and CatKey on October 21, 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.*