# instant3Dhub vs Castle Model Viewer

instant3Dhub and Castle Model Viewer are too close to call on the numbers: across 6 compared parameters — price, ads, in-app purchases and monetization model among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

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

## The numbers

| Metric | instant3Dhub | Castle Model Viewer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (2 ratings)](https://appshunter.io/ios/app/castle-model-viewer/id6752208775/reviews)** |
| Number of ratings | — | **2** |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 months | — |
| Monetization | Free | Free |
| Size | 3 MB | 72 MB |
| Requires iOS | 14.0 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 4+ |
| Developer | [Threedy GmbH](https://appshunter.io/developer/1557629917) | [MICHALIS KAMBURELIS](https://appshunter.io/developer/1838215378) |

## What reviewers say

### instant3Dhub

[App page](https://appshunter.io/ios/app/instant3dhub/id1573783711)

Experience 3D streaming and mixed reality on your mobile device. Ideal for industrial engineering and manufacturing, it allows you to place 3D data on surfaces and track models with advanced computer vision.

**Highlights:** 3D streaming to mobile, Mixed reality experiences, Anchoring 3D data to surfaces, Model tracking with computer vision, Support for various 3D data formats, Designed for industrial workflows

**Features:** macOS Compatibility

**In-app purchases:** none


### Castle Model Viewer

[App page](https://appshunter.io/ios/app/castle-model-viewer/id6752208775)

View and interact with a wide range of 2D and 3D model formats. Explore models, play animations, and save screenshots. Supports various file types including glTF, X3D, and OBJ, with options to open ZIP archives containing models and textures.

**Highlights:** Supports glTF, X3D, VRML, IFC, Spine JSON, and more, Open ZIP files with models and textures, Change navigation types (walk, fly, examine, 2D), Play animations, Save screenshots, Display scene statistics

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is instant3Dhub free?

instant3Dhub is free to download, with no in-app purchases.

### Is Castle Model Viewer free?

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

### Do instant3Dhub or Castle Model Viewer have ads?

Neither instant3Dhub nor Castle Model Viewer 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.*