# Built By Karl vs Biomtrx

The clearest difference is in-app purchases: Biomtrx at none against Built By Karl's 1. Biomtrx also leads on update cadence (every 9 days vs every 3 months). Built By Karl's advantage is device support (3 vs 1). On price, ads and iOS requirement there is nothing between them.

Both are free to download. Built By Karl sells 1 in-app purchase, starting at $299.99 per month. Biomtrx asks for nothing beyond the download.

Built By Karl ships an update every 3 months, Biomtrx every 9 days. The most recent releases landed on November 5, 2026 and November 6, 2026 respectively.

## The numbers

| Metric | Built By Karl | Biomtrx |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 9 days** |
| Size | 56 MB | 46 MB |
| Requires iOS | **15.0** | 16.4 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 17+ | 4+ |
| Developer | [Karl Jardine](https://appshunter.io/developer/1874177894) | [coFox Digital Ltd.](https://appshunter.io/developer/1114286411) |

## What reviewers say

### Built By Karl

[App page](https://appshunter.io/ios/app/built-by-karl/id6758647480)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly 1-1 | $299.99 | per month |


### Biomtrx

[App page](https://appshunter.io/ios/app/biomtrx/id6806771106)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Built By Karl free?

Built By Karl is free to download, with in-app purchases available.

### Is Biomtrx free?

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

### Do Built By Karl or Biomtrx have ads?

Neither Built By Karl nor Biomtrx shows ads.

### Which is updated more often, Built By Karl or Biomtrx?

Built By Karl ships an update every 3 months, and Biomtrx every 9 days. Most recently, Built By Karl was updated on November 5, 2026 and Biomtrx on November 6, 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.*