# MUSCL vs Fasti

The clearest difference is update cadence: MUSCL at every 4 days against Fasti's every 4 months. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. MUSCL sells 2 in-app purchases, starting at $19.99 per month and Fasti sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

MUSCL ships an update every 4 days, Fasti every 4 months. The most recent releases landed on November 5, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | MUSCL | Fasti |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 4 days** | Every 4 months |
| Size | 59 MB | 51 MB |
| Requires iOS | **15.1** | 16.4 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Apple Watch |
| Age rating | 17+ | 4+ |
| Developer | [IKARUS PTY LTD](https://appshunter.io/developer/1879736035) | [Glenn Francis](https://appshunter.io/developer/1875693789) |

## What reviewers say

### 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 |


### Fasti

[App page](https://appshunter.io/ios/app/fasti-intermittent-fasting/id6773243177)

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro | $9.99 | one-time |


## Frequently asked questions

### Is MUSCL free?

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

### Is Fasti free?

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

### Do MUSCL or Fasti have ads?

Neither MUSCL nor Fasti shows ads.

### Which is updated more often, MUSCL or Fasti?

MUSCL ships an update every 4 days, and Fasti every 4 months. Most recently, MUSCL was updated on November 5, 2026 and Fasti 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.*