# GD&T Check

> GD&T validation and reference tool for mechanical engineering students. (iPhone/iPad app by Alec Flavio Cardenas.)

- Source: https://appshunter.io/ios/app/gd-and-t-check/id6801021289 (this page in markdown: same URL + `.md`)
- Developer: [Alec Flavio Cardenas](https://appshunter.io/developer/6787530608)
- Category: Education, Utilities
- Price: Free
- Rating: 5.00/5 from 1 App Store ratings
- Age rating: 4+
- Requires: iOS 17.0 · 1 MB
- Languages: American English
- Released: 2026-08-17
- Data updated: 2026-10-07
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/gd-and-t-check/id6801021289/reviews.md

## What is GD&T Check?

GD&T Check helps mechanical engineering students validate their Geometric Dimensioning and Tolerancing callouts before submitting CAD drawings.

Select a feature type, pick a GD&T symbol, enter your tolerance and datum references, and the app instantly tells you if your callout is valid or invalid — with a specific explanation of what it means and what to fix.

CALLOUT CHECKER
Build a feature control frame step by step. The app validates your combination against ASME Y14.5-2018 rules and flags errors like missing datum references, incompatible feature types, or incorrect material condition modifiers.

PLAIN-ENGLISH EXPLANATIONS
Every callout gets translated into a clear sentence explaining what it physically means — no more guessing what a tolerance zone actually controls.

SYMBOL REFERENCE LIBRARY
Browse all 14 GD&T symbols with definitions, when to use each one, common mistakes, and datum rules. Organized by category: Form, Orientation, Location, Profile, and Runout.

SAVED HISTORY
Keep a log of every callout you check. Useful as a running reference while working through drawings or homework.

Built for students learning GD&T in college-level CAD, manufacturing, and metrology courses. Works fully offline — no account required, no internet needed.

## Key features

- GD&T callout validation
- Plain-English explanations
- Symbol reference library
- ASME Y14.5-2018 rules
- Offline functionality
- Saved history log


## Frequently asked questions about GD&T Check

### What is GD&T Check?

GD&T Check is a mobile application designed to help mechanical engineering students validate their Geometric Dimensioning and Tolerancing callouts. It checks callouts against ASME Y14.5-2018 rules and provides clear explanations.

### How does GD&T Check validate callouts?

The app allows you to build a feature control frame step by step, selecting feature types, GD&T symbols, tolerances, and datum references. It then validates your combination against ASME Y14.5-2018 rules and flags any errors.

### Does GD&T Check work offline?

Yes, GD&T Check works fully offline. No account or internet connection is required to use any of its features, making it convenient for studying anywhere.

### What GD&T symbols are included in GD&T Check?

GD&T Check includes a reference library with all 14 GD&T symbols. Definitions, usage guidelines, common mistakes, and datum rules are provided, organized by category: Form, Orientation, Location, Profile, and Runout.

### What is the learning methodology of GD&T Check?

GD&T Check employs a practical, step-by-step approach to learning GD&T. It validates user input against established standards and provides plain-English explanations to clarify the meaning of tolerances, aiding comprehension.

### How does GD&T Check track progress?

While GD&T Check doesn't have a formal progress tracking system like a course, it maintains a saved history of every callout you check. This log serves as a running reference for your work and study sessions.

### Is GD&T Check suitable for beginners?

Yes, GD&T Check is built for students learning GD&T. Its plain-English explanations and step-by-step validation process make complex concepts more accessible for beginners.

### Does GD&T Check offer certifications?

GD&T Check is a validation and reference tool for students and does not offer formal certifications. Its primary purpose is to aid in learning and practice of GD&T principles.

## Version history (last 1 release)

### 1.0.1 — 2026-08-17

No release notes.

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