# Merge Object Viewer vs EarthProject

The clearest difference is rating: Merge Object Viewer at 4.5 against EarthProject's 3.0. Merge Object Viewer also leads on ratings volume (390 vs 4). EarthProject's advantage is in-app purchases (none vs 4) and review sentiment (60% vs 48%). On price, update cadence, 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. EarthProject 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 390 ratings behind it against 4, so its average is the more settled of the two. Written reviews complicate that: 48% of Merge Object Viewer's written reviews are positive against 60% of EarthProject's, so the app with the better star average is not the one people write more warmly about.

Merge Object Viewer ships an update monthly, EarthProject every 3 weeks. The most recent releases landed on August 12, 2026 and June 1, 2026 respectively.

## The numbers

| Metric | Merge Object Viewer | EarthProject |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (390 ratings)](https://appshunter.io/ios/app/merge-object-viewer/id1367544362/reviews)** | [3.0 (4 ratings)](https://appshunter.io/ios/app/earthproject/id1580109940/reviews) |
| Number of ratings | **390** | 4 |
| Positive reviews | 48.1% of reviews | **60.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Monthly | **Every 3 weeks** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 414 MB | 93 MB |
| Requires iOS | 15.0 | **12.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Merge Apps](https://appshunter.io/developer/1253049593) | [TAKE ACTION GLOBAL Inc](https://appshunter.io/developer/1580109942) |

## What reviewers say

### 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


### EarthProject

[App page](https://appshunter.io/ios/app/earthproject/id1580109940)

Learn and get motivated to reduce your carbon and plastic footprint. This educational app provides tools and encouragement for sustainable living.

**Highlights:** Learn waste reduction techniques, Motivation for sustainable living, Carbon footprint tracking, Plastic waste reduction guidance, Educational content

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Merge Object Viewer free?

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

### Is EarthProject free?

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

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

Merge Object Viewer is rated higher. Merge Object Viewer averages 4.5 out of 5 from 390 ratings, while EarthProject averages 3.0 from 4 ratings.

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

Neither Merge Object Viewer nor EarthProject shows ads.

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

Merge Object Viewer ships an update monthly, and EarthProject every 3 weeks. Most recently, Merge Object Viewer was updated on August 12, 2026 and EarthProject on June 1, 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.*