# GD & T Guide vs Triangles in Geometry

The clearest difference is price: GD & T Guide at Free against Triangles in Geometry's $1.99. GD & T Guide also leads on update cadence (every 5 months vs every 27 months) and ratings volume (9 vs 1). Triangles in Geometry's advantage is rating (5.0 vs 3.0) and in-app purchases (none vs 2). On ads and device support there is nothing between them.

GD & T Guide is free to download; Triangles in Geometry costs $1.99 up front. GD & T Guide sells 2 one-off in-app purchases. Triangles in Geometry asks for nothing beyond the download.

Triangles in Geometry holds the better App Store score, 5.0 against 3.0. That said, the two scores are not equally well evidenced: GD & T Guide has 9 ratings behind it against 1, so its average is the more settled of the two.

GD & T Guide ships an update every 5 months, Triangles in Geometry every 27 months. The most recent releases landed on November 2, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | GD & T Guide | Triangles in Geometry |
| --- | --- | --- |
| Price | **Free** | $1.99 |
| Rating | [3.0 (9 ratings)](https://appshunter.io/ios/app/gd-and-t-guide/id1374135977/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/triangles-in-geometry/id1500084079/reviews)** |
| Number of ratings | **9** | 1 |
| Positive reviews | 20.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 5 months** | Every 27 months |
| Monetization | **Free with in-app purchases** | Paid |
| Size | 55 MB | 6 MB |
| Requires iOS | **11.0** | 14.1 |
| Devices | iPhone, iPad, iPod | **iPhone, iPad, iPod, Mac** |
| Age rating | 17+ | 4+ |
| Developer | [GeoTol Inc.](https://appshunter.io/developer/511287932) | [Gomathy Shankaran](https://appshunter.io/developer/503956143) |

## What reviewers say

### GD & T Guide

[App page](https://appshunter.io/ios/app/gd-and-t-guide/id1374135977)

This app provides a digital version of a pocket guide to Geometric Dimensioning and Tolerancing (GD&T). It explains GD&T symbols, their application on engineering drawings, and common inspection techniques. It also includes tools for converting measurements and calculating position tolerances.

**Highlights:** GD&T symbol descriptions, Engineering drawing application, Inspection techniques, Reporting methods, Measurement conversion tool, Fastener formula calculator

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full Book | $1.99 | one-time |
| Geometric Dimensioning and Tec | $3.99 | one-time |


### 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 GD & T Guide free?

GD & T Guide 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.

### Which has better reviews, GD & T Guide or Triangles in Geometry?

Triangles in Geometry is rated higher. GD & T Guide averages 3.0 out of 5 from 9 ratings, while Triangles in Geometry averages 5.0 from 1 ratings.

### Do GD & T Guide or Triangles in Geometry have ads?

Neither GD & T Guide nor Triangles in Geometry shows ads.

### Which is updated more often, GD & T Guide or Triangles in Geometry?

GD & T Guide ships an update every 5 months, and Triangles in Geometry every 27 months. Most recently, GD & T Guide was updated on November 2, 2026 and Triangles in Geometry on November 3, 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.*