# GD&T HD vs Cadaclysm

The clearest difference is update cadence: Cadaclysm at every 4 days against GD&T HD's every 11 months. GD&T HD's advantage is iOS requirement (15.0 vs 17.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

GD&T HD ships an update every 11 months, Cadaclysm every 4 days. The most recent releases landed on November 1, 2026 and October 29, 2026 respectively.

## The numbers

| Metric | GD&T HD | Cadaclysm |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[2.0 (1 ratings)](https://appshunter.io/ios/app/gd-and-t-hd/id627968870/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 11 months | **Every 4 days** |
| Monetization | Free | — |
| Size | 56 MB | 12 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | iPad | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Carl Zeiss AG](https://appshunter.io/developer/488066215) | [Blitter](https://appshunter.io/developer/6816093397) |

## What reviewers say

### GD&T HD

[App page](https://appshunter.io/ios/app/gd-and-t-hd/id627968870)

This app serves as a multimedia reference for understanding geometric dimensioning and tolerancing (GD&T) according to ISO 1101. It provides definitions, examples, and animations to help engineers and employees interpret and inspect GD&T concepts like form, position, and orientation tolerances.

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

**In-app purchases:** none


### Cadaclysm

[App page](https://appshunter.io/ios/app/cadaclysm/id6816093395)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is GD&T HD free?

GD&T HD is free to download, with no in-app purchases.

### Is Cadaclysm free?

Cadaclysm is free to download, with no in-app purchases.

### Do GD&T HD or Cadaclysm have ads?

Neither GD&T HD nor Cadaclysm shows ads.

### Which is updated more often, GD&T HD or Cadaclysm?

GD&T HD ships an update every 11 months, and Cadaclysm every 4 days. Most recently, GD&T HD was updated on November 1, 2026 and Cadaclysm on October 29, 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.*