# GD&T HD

> Reference app for learning and interpreting geometric dimensioning and tolerancing (GD&T). (iPhone/iPad app by Carl Zeiss AG.)

- Source: https://appshunter.io/ios/app/gd-and-t-hd/id627968870 (this page in markdown: same URL + `.md`)
- Developer: [Carl Zeiss AG](https://appshunter.io/developer/488066215)
- Category: Productivity
- Price: Free
- Rating: 2.00/5 from 1 App Store ratings · 1 written reviews indexed
- Age rating: 4+
- Requires: iOS 15.0 · 56 MB
- Languages: American English
- Released: 2013-04-29
- Data updated: 2026-06-03
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/gd-and-t-hd/id627968870/reviews.md

## What is GD&T HD?

Learn, interpret and inspect GD&T according to ISO 1101. This app describes a large range of definitions of geometric dimensioning and tolerancing  and supports engineers and employees as a multimedia reference book. As part of operative education, this app shows relationships and makes it easier to understand the right handling of form and position tolerances in practice. 
This app explains the most important definitions of GD&T and its interpretation by examples (straightness, roundness, flatness, cylindricity,  profile of a line, parallelism, squareness, angularity, position, concentricity, symmetry, circular runout, …)
-25 animations
-Basic information
-Form tolerance
-Profile tolerance
-Position tolerance
-Orientation tolerance
-Runout tolerance

## Key features

- ISO 1101 GD&T definitions
- Multimedia reference book
- Practical interpretation examples
- Form and position tolerance handling
- 25 animations
- Basic information

## Recent user reviews (1 of 1)

All indexed reviews: https://appshunter.io/ios/app/gd-and-t-hd/id627968870/reviews.md

### 2/5 — Fix

*2014-01-30*

Perpendicularity symbol is incorrect you labeled yours as straightness.

## Frequently asked questions about GD&T HD

### What is GD&T HD?

GD&T HD is a reference application designed to help users learn and interpret geometric dimensioning and tolerancing (GD&T) according to ISO 1101 standards. It offers definitions, examples, and animations to clarify concepts.

### What devices does GD&T HD support?

GD&T HD is currently supported on iPads. It is not available for other devices like iPhones or Android phones.

### Is GD&T HD free to use?

Yes, GD&T HD is available for free. There are no in-app purchases or subscription fees required to access its content.

### How often is GD&T HD updated?

The latest version of GD&T HD was released on February 22, 2022. Information on its update frequency beyond this is not provided, but it has been available since 2013.

### What specific GD&T concepts does GD&T HD cover?

GD&T HD explains key concepts including straightness, roundness, flatness, cylindricity, profile of a line, parallelism, squareness, angularity, position, concentricity, symmetry, and circular runout.

### What is the age rating for GD&T HD?

GD&T HD has an age rating of 4+. This indicates it is suitable for users of all ages, though its technical content is most relevant to adults in engineering fields.

### Does GD&T HD have ads?

No, GD&T HD does not contain advertisements. As a free application, it provides its educational content without interruption from ads.

### What is the user feedback on GD&T HD?

Based on the available data, GD&T HD has a rating of 2.0 stars from one rating. This suggests a mixed or potentially negative user experience from the limited feedback.

## Version history (last 5 releases)

### 3.0.1 — 2022-02-22

- Content adjustments
- Minor bug-fixes

### 2.0.8 — 2019-10-22

- Brandnew App-Design
- Multitasking-Support
- Reworked Content and Videos
- Updated Standards Directory
- Minor Bugfixes

### 2.0.7 — 2019-10-17

- Brandnew App-Design
- Multitasking-Support
- Reworked Content and Videos
- Updated Standards Directory
- Minor Bugfixes

### 2.0.5 — 2018-09-25

Added new content and fixed some minor bugs.

### 2.0.3 — 2017-01-31

Minor bug fixes and a new ebook link

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## More apps by Carl Zeiss AG

- [Light Lab](https://appshunter.io/ios/app/light-lab/id488066212)
- [GD&T](https://appshunter.io/ios/app/gd-and-t/id627973440)
- [ZEN browser](https://appshunter.io/ios/app/zen-browser/id665543029)
- [Labscope Material](https://appshunter.io/ios/app/labscope-material/id688689220)
- [VR ONE AR](https://appshunter.io/ios/app/vr-one-ar/id942844528)

All apps by Carl Zeiss AG: https://appshunter.io/developer/488066215

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-03.*