# RUNology vs Principle Guy

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

Both are free to download. RUNology sells 2 in-app purchases, starting at $8.99 per month. Principle Guy asks for nothing beyond the download.

RUNology ships an update fortnightly, Principle Guy every 2 days. The most recent releases landed on October 5, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | RUNology | Principle Guy |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Fortnightly | **Every 2 days** |
| Size | 106 MB | 88 MB |
| Requires iOS | **15.1** | 15.5 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 17+ | 4+ |
| Developer | [SHEmoves](https://appshunter.io/developer/1535639601) | [ERIK GARAJ](https://appshunter.io/developer/1712490237) |

## What reviewers say

### RUNology

[App page](https://appshunter.io/ios/app/runology/id1668075706)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| MAX | $8.99 | per month |
| LEVEL UP | $8.99 | per month |


### Principle Guy

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

**In-app purchases:** none


## Frequently asked questions

### Is RUNology free?

RUNology 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 RUNology or Principle Guy have ads?

Neither RUNology nor Principle Guy shows ads.

### Which is updated more often, RUNology or Principle Guy?

RUNology ships an update fortnightly, and Principle Guy every 2 days. Most recently, RUNology was updated on October 5, 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.*