# Catalyst Training Co vs MUSCL

The clearest difference is in-app purchases: Catalyst Training Co at none against MUSCL's 2. MUSCL's advantage is update cadence (every 4 days vs every 3 weeks). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. MUSCL sells 2 in-app purchases, starting at $19.99 per month. Catalyst Training Co asks for nothing beyond the download.

Catalyst Training Co ships an update every 3 weeks, MUSCL every 4 days. The most recent releases landed on October 17, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | Catalyst Training Co | MUSCL |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 4 days** |
| Size | 153 MB | 49 MB |
| Requires iOS | 15.1 | 15.1 |
| Devices | **iPhone, iPad, iPod, Apple Watch** | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Outer Strength Fitness Pty Ltd](https://appshunter.io/developer/1790202247) | [IKARUS PTY LTD](https://appshunter.io/developer/1879736035) |

## What reviewers say

### Catalyst Training Co

[App page](https://appshunter.io/ios/app/catalyst-training-co/id6755543686)

**Features:** Apple Wallet, Apple Watch app

**In-app purchases:** none


### MUSCL

[App page](https://appshunter.io/ios/app/muscl-physique-intelligence/id6759597207)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| MUSCL Monthly | $19.99 | per month |
| MUSCL Annual | $99.99 | per year |


## Frequently asked questions

### Is Catalyst Training Co free?

Catalyst Training Co is free to download, with no in-app purchases.

### Is MUSCL free?

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

### Do Catalyst Training Co or MUSCL have ads?

Neither Catalyst Training Co nor MUSCL shows ads.

### Which is updated more often, Catalyst Training Co or MUSCL?

Catalyst Training Co ships an update every 3 weeks, and MUSCL every 4 days. Most recently, Catalyst Training Co was updated on October 17, 2026 and MUSCL on October 10, 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.*