GD & T Guide vs Triangles in Geometry
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
GD & T Guide
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.
- GD&T symbol descriptions
- Engineering drawing application
- Inspection techniques
- Reporting methods
- Measurement conversion tool
- Fastener formula calculator
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This is an App version of our best-selling printed pocket guide on Geometric Dimensioning and Tolerancing (GD&T). In its 77 pages, it will give a description of GD&T symbols and their use on engineering drawings. Common inspection techniques and reporting methods are also included in the descriptions. There is a conversion app for X, Y rectangular measurements to position tolerance zones. There is a fixed and floating fastener formula App to calculate position tolerances using the standard screw and drilled clearance holes. Available in both inch and mm.
Triangles in Geometry
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.
- Triangle basics (Acute, Obtuse, Right Angle)
- Triangle centers (Centroid, Incenter, Orthocenter)
- Area calculations
- Triangle theorems and postulates explained
- Visual aids and images
- Review quizzes
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"Triangles in Geometry" is an educational app that describes the triangle basics - (Acute, Obtuse, Right Angle) and then progresses to explain various centers in a triangle - (Centroid, Incenter, Orthocenter) and Area. The app also summarizes and explains with images, triangles Theorems, and Postulates ( Proofs). Review questions (Quiz) at the end of the section has a few problems based on the triangle Theorems and Postulates.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | GD & T Guide | Triangles in Geometry |
|---|---|---|
| Price | Free — better | $1.99 |
| Rating | 3.0 (9 ratings) | 5.0 (1 ratings) — better |
| Positive reviews | 20.0% of reviews | — |
| Number of ratings | 9 — better | 1 |
| Update frequency | Every 5 months — better | Every 27 months |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases — better | Paid |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod, Mac — better |
| Requires iOS | 11.0 — better | 14.1 |
| Further details — not scored | ||
| Size | 55 MB | 6 MB |
| Age rating | 17+ | 4+ |
| Developer | GeoTol Inc. | Gomathy Shankaran |
Customer experience
GD & T Guide
Triangles in Geometry
In-app purchases
GD & T Guide
- Full Book$1.99
- Geometric Dimensioning and Tec$3.99
Triangles in Geometry
No in-app purchases
Questions
Is GD & T Guide free?
Is Triangles in Geometry free?
Which has better reviews, GD & T Guide or Triangles in Geometry?
Do GD & T Guide or Triangles in Geometry have ads?
Which is updated more often, GD & T Guide or Triangles in Geometry?
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