# Pre vs Triangles in Geometry

The clearest difference is price: Pre at Free against Triangles in Geometry's $1.99. Triangles in Geometry's advantage is in-app purchases (none vs 1). On update cadence, ads, device support and iOS requirement there is nothing between them.

Pre is free to download; Triangles in Geometry costs $1.99 up front. Pre sells 1 in-app purchase, starting at $4.99 per month. Triangles in Geometry asks for nothing beyond the download.

Pre ships an update every 31 months, Triangles in Geometry every 27 months. The most recent releases landed on October 24, 2026 and October 16, 2026 respectively.

## The numbers

| Metric | Pre | Triangles in Geometry |
| --- | --- | --- |
| Price | **Free** | $1.99 |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/triangles-in-geometry/id1500084079/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 31 months | **Every 27 months** |
| Monetization | — | Paid |
| Size | 296 MB | 6 MB |
| Requires iOS | 15.0 | **14.1** |
| Devices | iPhone, iPad, iPod | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Math Galaxy](https://appshunter.io/developer/500490521) | [Gomathy Shankaran](https://appshunter.io/developer/503956143) |

## What reviewers say

### Pre

[App page](https://appshunter.io/ios/app/pre-algebra-fundamentals/id551027794)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| PreAlgebra - Math Galaxy | $4.99 | per month |


### Triangles in Geometry

[App page](https://appshunter.io/ios/app/triangles-in-geometry/id1500084079)

Learn the fundamentals of triangles, including types, centers, and area calculations. This app explains theorems and postulates with visual aids and includes review quizzes to test understanding.

**Highlights:** Triangle basics (Acute, Obtuse, Right Angle), Triangle centers (Centroid, Incenter, Orthocenter), Area calculations, Triangle theorems and postulates explained, Visual aids and images, Review quizzes

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Pre free?

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

### Is Triangles in Geometry free?

Triangles in Geometry costs $1.99, with no in-app purchases.

### Do Pre or Triangles in Geometry have ads?

Neither Pre nor Triangles in Geometry shows ads.

### Which is updated more often, Pre or Triangles in Geometry?

Pre ships an update every 31 months, and Triangles in Geometry every 27 months. Most recently, Pre was updated on October 24, 2026 and Triangles in Geometry on October 16, 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.*