# Model Scaler vs Onshape 3D CAD

The clearest difference is rating: Onshape 3D CAD at 3.5 against Model Scaler's 2.9. Onshape 3D CAD also leads on update cadence (every 3 weeks vs every 6 months) and ratings volume (414 vs 12). Model Scaler's advantage is monetization model (free vs free with in-app purchases) and iOS requirement (9.0 vs 18.0). On price, review sentiment, ads and in-app purchases there is nothing between them.

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

Onshape 3D CAD holds the better App Store score, 3.5 against 2.9. That said, the two scores are not equally well evidenced: Onshape 3D CAD has 414 ratings behind it against 12, so its average is the more settled of the two. Written reviews point the same way: 40% of Model Scaler's written reviews are positive against 47% of Onshape 3D CAD's.

Model Scaler ships an update every 6 months, Onshape 3D CAD every 3 weeks. Both last shipped on October 21, 2026.

## The numbers

| Metric | Model Scaler | Onshape 3D CAD |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.9 (12 ratings)](https://appshunter.io/ios/app/model-scaler/id528641484/reviews) | **[3.5 (414 ratings)](https://appshunter.io/ios/app/onshape-3d-cad/id923421284/reviews)** |
| Number of ratings | 12 | **414** |
| Positive reviews | 40.0% of reviews | **47.3% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 months | **Every 3 weeks** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 11 MB | 77 MB |
| Requires iOS | **9.0** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Woodland Scenics](https://appshunter.io/developer/528641487) | [PTC Inc.](https://appshunter.io/developer/501201404) |

## What reviewers say

### Model Scaler

[App page](https://appshunter.io/ios/app/model-scaler/id528641484)

This tool instantly converts measurements between U.S. Customary and Metric units for any modeling scale. It's designed to be fast, easy, and efficient for all types of scale modelers.

**Highlights:** Instant scale conversion, U.S. Customary to Metric, Metric to U.S. Customary, Supports any modeling scale, Fast and efficient

**Features:** macOS Compatibility

**In-app purchases:** none


### Onshape 3D CAD

[App page](https://appshunter.io/ios/app/onshape-3d-cad/id923421284)

This professional CAD platform enables real-time collaboration on product design from any device. It offers parametric modeling tools, secure cloud storage, and version control, streamlining the design process for teams and individuals. Supports students and educators with free access for non-commercial projects.

**Highlights:** Parametric modeling tools, Real-time team collaboration, Cloud-based data management, Cross-device access, Version control and history, Commenting and feedback tools

**In-app purchases:** none

**What reviewers like**

- 🚀 Powerful CAD features
- 🌐 Accessible from any device
- 👍 Intuitive interface
- 💡 Great for on-site work
- 🌟 Exceptional for a free app

**What reviewers complain about**

- 🐛 Crashes and stability issues
- 👎 Unintuitive and clunky UI
- 🔒 Requires account sign-up
- 💰 Expensive paid plans
- 🔍 Difficult to find/use key features

**Reported bugs**

- Frequent crashes and freezes
- Dimensions not visible/editable
- Rotation/view controls unreliable
- Unable to create account
- Incompatible with older devices

**Requested features**

- Add keyboard shortcuts
- Improve dimensioning tools
- Allow private file storage
- Optimize for iPad/Apple Pencil
- Provide better documentation/tutorials


## Frequently asked questions

### Is Model Scaler free?

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

### Is Onshape 3D CAD free?

Onshape 3D CAD is free to download, with no in-app purchases.

### Which has better reviews, Model Scaler or Onshape 3D CAD?

Onshape 3D CAD is rated higher. Model Scaler averages 2.9 out of 5 from 12 ratings, while Onshape 3D CAD averages 3.5 from 414 ratings.

### Do Model Scaler or Onshape 3D CAD have ads?

Neither Model Scaler nor Onshape 3D CAD shows ads.

### Which is updated more often, Model Scaler or Onshape 3D CAD?

Model Scaler ships an update every 6 months, and Onshape 3D CAD every 3 weeks. Most recently, Model Scaler was updated on October 21, 2026 and Onshape 3D CAD on October 21, 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.*