# Geometric Concepts vs GetPrincipia

The clearest difference is price: GetPrincipia at Free against Geometric Concepts's $2.99. GetPrincipia also leads on update cadence (every 2 months vs every 39 months). Geometric Concepts's advantage is in-app purchases (none vs 2). On ads, device support and iOS requirement there is nothing between them.

GetPrincipia is free to download; Geometric Concepts costs $2.99 up front. GetPrincipia sells 2 in-app purchases, starting at $6.99 per month. Geometric Concepts asks for nothing beyond the download.

Geometric Concepts ships an update every 39 months, GetPrincipia every 2 months. The most recent releases landed on October 27, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Geometric Concepts | GetPrincipia |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 39 months | **Every 2 months** |
| Size | 3 MB | 38 MB |
| Requires iOS | 16.0 | **15.1** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Gomathy Shankaran](https://appshunter.io/developer/503956143) | [Axiom 38 LLC](https://appshunter.io/developer/1887968723) |

## What reviewers say

### Geometric Concepts

[App page](https://appshunter.io/ios/app/geometric-concepts/id1671240125)

**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 Geometric Concepts free?

Geometric Concepts costs $2.99, with no in-app purchases.

### Is GetPrincipia free?

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

### Do Geometric Concepts or GetPrincipia have ads?

Neither Geometric Concepts nor GetPrincipia shows ads.

### Which is updated more often, Geometric Concepts or GetPrincipia?

Geometric Concepts ships an update every 39 months, and GetPrincipia every 2 months. Most recently, Geometric Concepts was updated on October 27, 2026 and GetPrincipia on October 31, 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.*