# BodyFix.io vs Principle Guy

The clearest difference is in-app purchases: Principle Guy at none against BodyFix.io's 1. Principle Guy also leads on update cadence (every 2 days vs fortnightly). BodyFix.io's advantage is iOS requirement (13.0 vs 15.5). On price, ads and device support there is nothing between them.

Both are free to download. BodyFix.io sells 1 one-off in-app purchase. Principle Guy asks for nothing beyond the download.

BodyFix.io ships an update fortnightly, Principle Guy every 2 days. The most recent releases landed on October 6, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | BodyFix.io | Principle Guy |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Fortnightly | **Every 2 days** |
| Size | 80 MB | 88 MB |
| Requires iOS | **13.0** | 15.5 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 17+ | 4+ |
| Developer | [BodyFix Technologies s.r.o.](https://appshunter.io/developer/1454289334) | [ERIK GARAJ](https://appshunter.io/developer/1712490237) |

## What reviewers say

### BodyFix.io

[App page](https://appshunter.io/ios/app/bodyfixio/id1454289335)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Protetika Zdravé nôžky | $2.99 | one-time |


### Principle Guy

[App page](https://appshunter.io/ios/app/principle-guy/id6469705600)

**In-app purchases:** none


## Frequently asked questions

### Is BodyFix.io free?

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

### Is Principle Guy free?

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

### Do BodyFix.io or Principle Guy have ads?

Neither BodyFix.io nor Principle Guy shows ads.

### Which is updated more often, BodyFix.io or Principle Guy?

BodyFix.io ships an update fortnightly, and Principle Guy every 2 days. Most recently, BodyFix.io was updated on October 6, 2026 and Principle Guy on October 14, 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.*