# Model Viewer | CAD Viewer vs Protoboard Designer

The clearest difference is update cadence: Protoboard Designer at every 5 days against Model Viewer | CAD Viewer's every 2 weeks. Protoboard Designer also leads on 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. Model Viewer | CAD Viewer sells 2 in-app purchases, starting at $1.99 per month and Protoboard Designer sells 2 in-app purchases, starting at $5.99 per month. Whichever you choose, the download price is not the number that matters.

Model Viewer | CAD Viewer ships an update every 2 weeks, Protoboard Designer every 5 days. The most recent releases landed on October 19, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Model Viewer | CAD Viewer | Protoboard Designer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/model-viewer-cad-viewer/id6781777518/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 2 weeks | **Every 5 days** |
| Monetization | Free | — |
| Size | 12 MB | 54 MB |
| Requires iOS | 17.0 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Astonish Innovations](https://appshunter.io/developer/487194923) | [Protoboard Designer Korlatolt Felelossegu Tarsasag](https://appshunter.io/developer/1095600199) |

## What reviewers say

### Model Viewer | CAD Viewer

[App page](https://appshunter.io/ios/app/model-viewer-cad-viewer/id6781777518)

View and inspect 3D model files with ease. Import various formats, manipulate the view with intuitive controls, and access basic model information on a clear workspace.

**Highlights:** 3D model inspection, Import multiple file formats, Rotate, pan, and zoom controls, Toggle grid workspace, View basic model details

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Model Viewer Pro Monthly | $1.99 | per month |
| Model Viewer Pro Yearly | $19.99 | per year |


### Protoboard Designer

[App page](https://appshunter.io/ios/app/protoboard-designer-pcb-cad/id6799526213)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Maker | $5.99 | per month |
| Engineer | $12.99 | per month |


## Frequently asked questions

### Is Model Viewer | CAD Viewer free?

Model Viewer | CAD Viewer is free to download, with in-app purchases available.

### Is Protoboard Designer free?

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

### Do Model Viewer | CAD Viewer or Protoboard Designer have ads?

Neither Model Viewer | CAD Viewer nor Protoboard Designer shows ads.

### Which is updated more often, Model Viewer | CAD Viewer or Protoboard Designer?

Model Viewer | CAD Viewer ships an update every 2 weeks, and Protoboard Designer every 5 days. Most recently, Model Viewer | CAD Viewer was updated on October 19, 2026 and Protoboard Designer on October 31, 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.*