# Coordination and Response vs Merge Object Viewer

The clearest difference is review sentiment: Merge Object Viewer at 48% against Coordination and Response's 0%. Merge Object Viewer also leads on price (Free vs $0.99) and rating (4.5 vs 1.0). Coordination and Response's advantage is in-app purchases (none vs 4) and iOS requirement (12.0 vs 15.0). On ads and device support there is nothing between them.

Merge Object Viewer is free to download; Coordination and Response costs $0.99 up front. Merge Object Viewer sells 4 in-app purchases, starting at $9.99 per month. Coordination and Response asks for nothing beyond the download.

Merge Object Viewer holds the better App Store score, 4.5 against 1.0. That said, the two scores are not equally well evidenced: Merge Object Viewer has 389 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 0% of Coordination and Response's written reviews are positive against 48% of Merge Object Viewer's.

Coordination and Response ships an update every 28 months, Merge Object Viewer monthly. The most recent releases landed on June 1, 2026 and October 22, 2026 respectively.

## The numbers

| Metric | Coordination and Response | Merge Object Viewer |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | [1.0 (1 ratings)](https://appshunter.io/ios/app/coordination-and-response/id1198448447/reviews) | **[4.5 (389 ratings)](https://appshunter.io/ios/app/merge-object-viewer/id1367544362/reviews)** |
| Number of ratings | 1 | **389** |
| Positive reviews | 0.0% of reviews | **47.6% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 28 months | **Monthly** |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 24 MB | 414 MB |
| Requires iOS | **12.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 12+ | 4+ |
| Developer | [www.ajaxmediatech.com](https://appshunter.io/developer/973768003) | [Merge Apps](https://appshunter.io/developer/1253049593) |

## What reviewers say

### Coordination and Response

[App page](https://appshunter.io/ios/app/coordination-and-response/id1198448447)

This interactive educational app helps students aged 11-15 learn about the human nervous system, hormones, and related biological concepts through colorful visuals and hands-on activities. It offers a learning module, practice exercises, and a quiz to reinforce understanding of coordination and response biology.

**Highlights:** Learn about nervous system and hormones, Interactive DIY activities, Challenging quiz section, Colorful visual aids, Student-friendly interface

**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 Coordination and Response free?

Coordination and Response costs $0.99, 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, Coordination and Response or Merge Object Viewer?

Merge Object Viewer is rated higher. Coordination and Response averages 1.0 out of 5 from 1 ratings, while Merge Object Viewer averages 4.5 from 389 ratings.

### Do Coordination and Response or Merge Object Viewer have ads?

Neither Coordination and Response nor Merge Object Viewer shows ads.

### Which is updated more often, Coordination and Response or Merge Object Viewer?

Coordination and Response ships an update every 28 months, and Merge Object Viewer monthly. Most recently, Coordination and Response was updated on June 1, 2026 and Merge Object Viewer on October 22, 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.*