# GDSII Viewer vs Sigmakey

The clearest difference is rating: Sigmakey at 2.0 against GDSII Viewer's 1.0. On price, ratings volume, ads and in-app purchases there is nothing between them.

Both are free to download. GDSII Viewer sells 4 in-app purchases, starting at $0.99 per month and Sigmakey sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Sigmakey holds the better App Store score, 2.0 against 1.0. Both are backed by a comparable volume of ratings — 1 and 1 respectively.

## The numbers

| Metric | GDSII Viewer | Sigmakey |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [1.0 (1 ratings)](https://appshunter.io/ios/app/gdsii-viewer/id6502424439/reviews) | **[2.0 (1 ratings)](https://appshunter.io/ios/app/sigmakey-math-keyboard/id6788025133/reviews)** |
| Number of ratings | 1 | 1 |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | — |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 13 MB | 13 MB |
| Requires iOS | 26.0 | 26.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [AIP Technology Corporation, Taiwan Branch](https://appshunter.io/developer/1733199040) | [Andrii Bashta](https://appshunter.io/developer/1547467775) |

## What reviewers say

### GDSII Viewer

[App page](https://appshunter.io/ios/app/gdsii-viewer/id6502424439)

This utility allows users to view and analyze GDSII files, essential for semiconductor design. It offers high precision viewing, layer management, and detailed inspection tools to streamline integrated circuit design processes.

**Highlights:** High precision GDSII file viewing, Layer management and toggling, Zoom and pan functionality, Detailed inspection tools, Streamlines IC design process

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Viewer(Monthly) | $0.99 | per month |
| Viewer(Annual) | $9.99 | per year |
| Editor(Monthly) | $9.99 | per month |
| Editor(Annual) | $99.99 | per year |


### Sigmakey

[App page](https://appshunter.io/ios/app/sigmakey-math-keyboard/id6788025133)

This utility provides a specialized keyboard for typing mathematical expressions, including fractions, roots, and Greek letters, directly within any app. It supports LaTeX, Unicode, and image output, with on-device processing for privacy and speed.

**Highlights:** Full math keyboard layout, Two-dimensional cursor for exponents/numerators, Type LaTeX, Unicode, or rendered image, On-device typesetting, no network required, Symbol search, recent, and favorite symbols

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Sigmakey Pro | $9.99 | one-time |


## Frequently asked questions

### Is GDSII Viewer free?

GDSII Viewer is free to download, with in-app purchases available.

### Is Sigmakey free?

Sigmakey is free to download, with in-app purchases available.

### Which has better reviews, GDSII Viewer or Sigmakey?

Sigmakey is rated higher. GDSII Viewer averages 1.0 out of 5 from 1 ratings, while Sigmakey averages 2.0 from 1 ratings.

### Do GDSII Viewer or Sigmakey have ads?

Neither GDSII Viewer nor Sigmakey shows ads.

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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.*