GD & T Guide vs Geometry Calculator++
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.
Geometry Calculator++
This app helps you solve for the parameters of various geometric shapes and visually draws them. It supports multiple triangle types, squares, rectangles, circles, and regular polygons. Available for iPhone and iPad with a single purchase.
- Solves geometric parameters
- Draws geometric shapes
- Supports triangles, squares, rectangles, circles, and polygons
- Universal app for iPhone and iPad
- Single purchase
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Geometry Calculator++ is a universal app that runs on your iPhone and iPad with a single purchase. It helps you solve for the parameters of geometrics shapes. It draws them as well. Currently the following shapes are available: - Right Triangle - Isosceles Triangle - Rectangle - Square - Circle - Regular Polygon - Rhombus
Screenshots
Verdict
The clearest difference is review sentiment: Geometry Calculator++ at 100% against GD & T Guide's 20%. Geometry Calculator++ also leads on in-app purchases (none vs 2) and update cadence (fortnightly vs every 5 months). GD & T Guide's advantage is price (Free vs $2.99) and iOS requirement (11.0 vs 15). On ratings volume, 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; Geometry Calculator++ costs $2.99 up front. GD & T Guide sells 2 one-off in-app purchases. Geometry Calculator++ asks for nothing beyond the download.
Geometry Calculator++ holds the better App Store score, 3.4 against 3.0. Both are backed by a comparable volume of ratings — 9 and 5 respectively. Written reviews point the same way: 20% of GD & T Guide's written reviews are positive against 100% of Geometry Calculator++'s.
GD & T Guide ships an update every 5 months, Geometry Calculator++ fortnightly. The most recent releases landed on November 2, 2026 and November 3, 2026 respectively.
| Parameter | GD & T Guide | Geometry Calculator++ |
|---|---|---|
| Price | Free — better | $2.99 |
| Rating | 3.0 (9 ratings) | 3.4 (5 ratings) — better |
| Positive reviews | 20.0% of reviews | 100.0% of reviews — better |
| Number of ratings | 9 — better | 5 |
| Update frequency | Every 5 months | Fortnightly — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases — better | Paid |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 11.0 — better | 15 |
| Further details — not scored | ||
| Size | 55 MB | 1 MB |
| Age rating | 17+ | 4+ |
| Developer | GeoTol Inc. | Dogahe |
Customer experience
GD & T Guide
Geometry Calculator++
In-app purchases
GD & T Guide
- Full Book$1.99
- Geometric Dimensioning and Tec$3.99
Geometry Calculator++
No in-app purchases
Questions
Is GD & T Guide free?
Is Geometry Calculator++ free?
Which has better reviews, GD & T Guide or Geometry Calculator++?
Do GD & T Guide or Geometry Calculator++ have ads?
Which is updated more often, GD & T Guide or Geometry Calculator++?
Other comparisons
