# iCTF vs GetPrincipia

The clearest difference is price: GetPrincipia at Free against iCTF's $3.99. iCTF's advantage is in-app purchases (none vs 2) and iOS requirement (13.0 vs 15.1). On update cadence, ads and device support there is nothing between them.

GetPrincipia is free to download; iCTF costs $3.99 up front. GetPrincipia sells 2 in-app purchases, starting at $6.99 per month. iCTF asks for nothing beyond the download.

Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on September 24, 2026 and September 14, 2026 respectively.

## The numbers

| Metric | iCTF | GetPrincipia |
| --- | --- | --- |
| Price | $3.99 | **Free** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | Every 2 months |
| Size | 24 MB | 38 MB |
| Requires iOS | **13.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Jeremy Laratro](https://appshunter.io/developer/1864044207) | [Axiom 38 LLC](https://appshunter.io/developer/1887968723) |

## What reviewers say

### iCTF

[App page](https://appshunter.io/ios/app/ictf/id6756991047)

**Features:** macOS Compatibility

**In-app purchases:** none


### GetPrincipia

[App page](https://appshunter.io/ios/app/getprincipia/id6761139348)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $6.99 | per month |
| Annual | $44.99 | per year |


## Frequently asked questions

### Is iCTF free?

iCTF costs $3.99, with no in-app purchases.

### Is GetPrincipia free?

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

### Do iCTF or GetPrincipia have ads?

Neither iCTF nor GetPrincipia shows ads.

### Which is updated more often, iCTF or GetPrincipia?

iCTF ships an update every 2 months, and GetPrincipia every 2 months. Most recently, iCTF was updated on September 24, 2026 and GetPrincipia on September 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.*