# Metrix vs Whos Free When?

The clearest difference is update cadence: Metrix at every 3 days against Whos Free When?'s every 8 days. Whos Free When?'s advantage is iOS requirement (15.1 vs 17.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Metrix sells 1 one-off in-app purchase and Whos Free When? sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Metrix ships an update every 3 days, Whos Free When? every 8 days. The most recent releases landed on October 24, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | Metrix | Whos Free When? |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (4 ratings)](https://appshunter.io/ios/app/metrix-unit-converter/id6761781992/reviews)** | — |
| Number of ratings | **4** | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 3 days** | Every 8 days |
| Monetization | Free | — |
| Size | 20 MB | 23 MB |
| Requires iOS | 17.0 | **15.1** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Reply200 Inc.](https://appshunter.io/developer/1884105749) | [Joe Cobain](https://appshunter.io/developer/1896310511) |

## What reviewers say

### Metrix

[App page](https://appshunter.io/ios/app/metrix-unit-converter/id6761781992)

Effortlessly convert between units and currencies as you type. Supports over 80 units across 14 categories, including international sizing and cooking measurements. Offers smart paste, compound formats, and offline currency conversion.

**Highlights:** Converts as you type, 80+ units and 14 categories, International sizing conversions, Offline currency exchange rates, Smart paste for values and units, Compound measurement formats, Customizable categories and units

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Metrix Pro | $5.99 | one-time |


### Whos Free When?

[App page](https://appshunter.io/ios/app/whos-free-when/id6766639747)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| WhosFreeWhen Pro Lifetime | $2.99 | one-time |


## Frequently asked questions

### Is Metrix free?

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

### Is Whos Free When? free?

Whos Free When? is free to download, with in-app purchases available.

### Do Metrix or Whos Free When? have ads?

Neither Metrix nor Whos Free When? shows ads.

### Which is updated more often, Metrix or Whos Free When??

Metrix ships an update every 3 days, and Whos Free When? every 8 days. Most recently, Metrix was updated on October 24, 2026 and Whos Free When? on October 28, 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.*