# Makeblock－Play STEM Robots vs Merge Object Viewer

The clearest difference is rating: Merge Object Viewer at 4.5 against Makeblock－Play STEM Robots's 3.7. Makeblock－Play STEM Robots's advantage is in-app purchases (none vs 4) and iOS requirement (10.0 vs 15.0). On price, review sentiment, ratings volume and update cadence there is nothing between them.

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

Merge Object Viewer holds the better App Store score, 4.5 against 3.7. Both are backed by a comparable volume of ratings — 202 and 389 respectively. Written reviews point the same way: 47% of Makeblock－Play STEM Robots's written reviews are positive against 48% of Merge Object Viewer's.

Makeblock－Play STEM Robots ships an update every 6 weeks, Merge Object Viewer monthly. The most recent releases landed on September 17, 2026 and September 29, 2026 respectively.

## The numbers

| Metric | Makeblock－Play STEM Robots | Merge Object Viewer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.7 (202 ratings)](https://appshunter.io/ios/app/makeblockplay-stem-robots/id918804737/reviews) | **[4.5 (389 ratings)](https://appshunter.io/ios/app/merge-object-viewer/id1367544362/reviews)** |
| Number of ratings | 202 | **389** |
| Positive reviews | 46.6% of reviews | **47.6% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 6 weeks | **Monthly** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 458 MB | 414 MB |
| Requires iOS | **10.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Makeblock Co., Ltd.](https://appshunter.io/developer/1002364464) | [Merge Apps](https://appshunter.io/developer/1253049593) |

## What reviewers say

### Makeblock－Play STEM Robots

[App page](https://appshunter.io/ios/app/makeblockplay-stem-robots/id918804737)

Control and program robots with a user-friendly interface. Design custom controllers and explore STEM education through interactive robot play. Supports a variety of robot models and multiple languages.

**Highlights:** Robot control via official controller, Create custom robot controllers, Graphical programming for complex functions, User-friendly interface, Supports multiple Makeblock robot models, Multi-language support

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

**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 Makeblock－Play STEM Robots free?

Makeblock－Play STEM Robots 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, Makeblock－Play STEM Robots or Merge Object Viewer?

Merge Object Viewer is rated higher. Makeblock－Play STEM Robots averages 3.7 out of 5 from 202 ratings, while Merge Object Viewer averages 4.5 from 389 ratings.

### Do Makeblock－Play STEM Robots or Merge Object Viewer have ads?

Neither Makeblock－Play STEM Robots nor Merge Object Viewer shows ads.

### Which is updated more often, Makeblock－Play STEM Robots or Merge Object Viewer?

Makeblock－Play STEM Robots ships an update every 6 weeks, and Merge Object Viewer monthly. Most recently, Makeblock－Play STEM Robots was updated on September 17, 2026 and Merge Object Viewer on September 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.*