# ZipGrade vs Merge Object Viewer

The clearest difference is review sentiment: ZipGrade at 86% against Merge Object Viewer's 48%. ZipGrade also leads on rating (4.9 vs 4.5) and ratings volume (36K vs 389). On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. ZipGrade sells 1 one-off in-app purchase and Merge Object Viewer sells 4 in-app purchases, starting at $9.99 per month. Whichever you choose, the download price is not the number that matters.

ZipGrade holds the better App Store score, 4.9 against 4.5. That said, the two scores are not equally well evidenced: ZipGrade has 36K ratings behind it against 389, so its average is the more settled of the two. Written reviews point the same way: 86% of ZipGrade's written reviews are positive against 48% of Merge Object Viewer's.

ZipGrade ships an update every 6 weeks, Merge Object Viewer monthly. The most recent releases landed on October 18, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | ZipGrade | Merge Object Viewer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.9 (36K ratings)](https://appshunter.io/ios/app/zipgrade/id635077270/reviews)** | [4.5 (389 ratings)](https://appshunter.io/ios/app/merge-object-viewer/id1367544362/reviews) |
| Number of ratings | **36K** | 389 |
| Positive reviews | **86.0% of reviews** | 47.6% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 6 weeks | **Monthly** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 30 MB | 414 MB |
| Requires iOS | **13.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [ZipGrade LLC](https://appshunter.io/developer/582826575) | [Merge Apps](https://appshunter.io/developer/1253049593) |

## What reviewers say

### ZipGrade

[App page](https://appshunter.io/ios/app/zipgrade/id635077270)

Instantly grade multiple-choice tests and quizzes using your device's camera. This app offers a fast and accurate way for educators to assess student work, with features for organizing and exporting results. It provides immediate feedback to inform lesson planning and assignments.

**Highlights:** Instant grading with device camera, Supports multiple choice tests and quizzes, Organizes and exports results (PDF, Excel), Free answer sheet templates available, Companion website for data management, Stores results by student, subject, and quiz

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Add 1 year of use | $6.99 | one-time |

**What reviewers like**

- 🚀 Efficient grading
- 👍 Instant feedback for students
- 📊 Detailed data analysis
- 💰 Affordable subscription
- ⏱️ Time-saving

**What reviewers complain about**

- 🐛 Inconsistent scanning issues
- 🔍 Difficulty navigating interface
- 🔢 Lack of class/student grouping options
- 🖼️ Poor image quality for student names

**Reported bugs**

- Scanning issues with flat surface detection
- Incorrect answer marking due to eraser marks

**Requested features**

- Ability to change question point values in bulk
- Option to create/edit answer keys on website
- Support for non-multiple choice question types
- Improved data export/integration with other systems


### 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 ZipGrade free?

ZipGrade is free to download, with in-app purchases available.

### Is Merge Object Viewer free?

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

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

ZipGrade is rated higher. ZipGrade averages 4.9 out of 5 from 36K ratings, while Merge Object Viewer averages 4.5 from 389 ratings.

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

Neither ZipGrade nor Merge Object Viewer shows ads.

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

ZipGrade ships an update every 6 weeks, and Merge Object Viewer monthly. Most recently, ZipGrade was updated on October 18, 2026 and Merge Object Viewer on October 13, 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.*