# RoboFellow vs Merge Object Viewer

The clearest difference is rating: Merge Object Viewer at 4.5 against RoboFellow's 3.0. Merge Object Viewer also leads on ratings volume (389 vs 4). RoboFellow's advantage is in-app purchases (none vs 4) and update cadence (every 3 days vs monthly). On price, ads and device support there is nothing between them.

Both are free to download. Merge Object Viewer sells 4 in-app purchases, starting at $9.99 per month. RoboFellow asks for nothing beyond the download.

Merge Object Viewer holds the better App Store score, 4.5 against 3.0. That said, the two scores are not equally well evidenced: Merge Object Viewer has 389 ratings behind it against 4, so its average is the more settled of the two.

RoboFellow ships an update every 3 days, Merge Object Viewer monthly. The most recent releases landed on October 21, 2026 and October 29, 2026 respectively.

## The numbers

| Metric | RoboFellow | Merge Object Viewer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.0 (4 ratings)](https://appshunter.io/ios/app/robofellow/id1248744200/reviews) | **[4.5 (389 ratings)](https://appshunter.io/ios/app/merge-object-viewer/id1367544362/reviews)** |
| Number of ratings | 4 | **389** |
| Positive reviews | — | 47.6% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 3 days** | Monthly |
| Monetization | **Free** | Free with in-app purchases |
| Size | 60 MB | 414 MB |
| Requires iOS | **9.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [RoboGarden Inc.](https://appshunter.io/developer/1248744199) | [Merge Apps](https://appshunter.io/developer/1253049593) |

## What reviewers say

### RoboFellow

[App page](https://appshunter.io/ios/app/robofellow/id1248744200)

This app allows users to control LEGO MINDSTORMS robots using a drag-and-drop block coding interface. It is designed for children aged 10 and above to engage with robotics and programming concepts.

**Highlights:** Control LEGO MINDSTORMS robots, Drag-and-drop block coding, Educational engagement for children, Robotics programming, Targeted for ages 10+

**Features:** macOS Compatibility

**In-app purchases:** none


### Merge Object Viewer

[App page](https://appshunter.io/ios/app/merge-object-viewer/id1367544362)

Explore hundreds of 3D digital teaching aids with this app. Students can interact with models of rocks, mammals, cells, and more. The app also allows users to upload and view their own 3D objects on a compatible device.

**Highlights:** Hundreds of 3D teaching aids, Interactive 3D models, Learn about science and biology, Upload and view custom 3D objects, Hands-on digital learning

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Object Viewer Premium Monthly | $9.99 | per month |
| Merge EDU Individual | $9.99 | per month |
| Object Viewer Premium Annual | $99.99 | per year |
| Merge EDU Individual | $99.99 | per year |

**What reviewers like**

- 🚀 Engaging AR STEM tool
- 👍 Intuitive interface
- 👍 Seamless object merging
- 👍 Extensive file format support
- 👍 Convenient sharing options

**What reviewers complain about**

- 🐛 Frequent crashes
- 🐛 Slow rendering/loading
- 🐛 Compatibility issues on older devices
- 🔒 Paywall for full access
- 🐛 Unstable login/account management

**Reported bugs**

- Objects not loading or displaying incorrectly
- App freezing or closing unexpectedly
- Labeling/annotation issues with 3D objects
- Compatibility problems on iPads and older iOS versions

**Requested features**

- Adjustable lighting for 3D objects
- Ability to snap objects together
- Camera button for capturing scenes
- Restore VR support
- More free 3D content options


## Frequently asked questions

### Is RoboFellow free?

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

### Is Merge Object Viewer free?

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

### Which has better reviews, RoboFellow or Merge Object Viewer?

Merge Object Viewer is rated higher. RoboFellow averages 3.0 out of 5 from 4 ratings, while Merge Object Viewer averages 4.5 from 389 ratings.

### Do RoboFellow or Merge Object Viewer have ads?

Neither RoboFellow nor Merge Object Viewer shows ads.

### Which is updated more often, RoboFellow or Merge Object Viewer?

RoboFellow ships an update every 3 days, and Merge Object Viewer monthly. Most recently, RoboFellow was updated on October 21, 2026 and Merge Object Viewer 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.*