Merge Object Viewer vs HMH Science Dimensions
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Merge Object Viewer
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.
- Hundreds of 3D teaching aids
- Interactive 3D models
- Learn about science and biology
- Upload and view custom 3D objects
- Hands-on digital learning
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PLEASE NOTE: This app requires a Merge Cube and a smartphone or a tablet to play. To find out how to get a Merge Cube and to learn more, visit our website at: https://www.MergeCube.com. Object Viewer puts hundreds of digital teaching aids in the palm of your hand! Students can learn about rocks and minerals, mammals, reptiles, lifecycles, cells, and so much more using different collections of hands-on 3D models. Students can also upload, view, and share their own 3D objects on the Merge Cube. If you have any questions or suggestions, we would love to hear from you! Contact us at any time at support@MergeEdu.com. Privacy Policy: https://MergeEdu.com/privacy-policy Terms of Use: https://MergeEdu.com/terms-of-use
HMH Science Dimensions
This augmented reality app transforms book covers into interactive science experiments. Students can scan their textbooks to launch 3D models and explore concepts like weather, solar energy, and the solar system. It's designed to make learning engaging and fun for young students.
- Augmented reality science experiments
- Scan book covers to activate content
- Interactive 3D models
- Explores various science topics
- Engaging learning experience
- Group or pair work friendly
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HMH Science Dimensions AR! (In order to access this app’s content, you will need any Student Edition book cover from HMH’s California Science Dimensions AR program). HMH Science Dimensions AR is an augmented reality tool that turns your students’ book cover into a fun, unique learning experience. To play, open the app and scan the Student Activity Book cover from any grade using a smartphone or tablet. Then watch an augmented reality experiment pop right out of it! HMH Science Dimensions AR gets students out of their seats and thinking about the science they’ll be learning in the coming year. It can also serve as a short, fun homework activity. For target images please go to: https://prod-hmhco-vmg-craftcms-private.s3.amazonaws.com/documents/CA_SD_AR_Covers.pdf Experiments and investigations include… Weather Materials Solar Energy Food Chains Biological Systems Photosynthesis The Solar System Sound Waves How Crystals Form Tips Move your device around the cover and even move the cover itself to get the full experience. The experiments lend themselves well to students working in small groups or pairs. App Info This app does not collect any personally identifiable information. This app contains no social media sharing or links to websites. This app does not track the user’s location. For users age 6 or younger, we recommend child-safe device covers. Avoid pressing buttons or controls outside the main screen area when holding the device as doing so may minimize or close the game.
Screenshots
Verdict
The clearest difference is rating: Merge Object Viewer at 4.5 against HMH Science Dimensions's 2.3. Merge Object Viewer also leads on review sentiment (48% vs 25%) and ratings volume (389 vs 17). HMH Science Dimensions's advantage is in-app purchases (none vs 4) and iOS requirement (9.0 vs 15.0). On price, update cadence, ads and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Merge Object Viewer sells 4 in-app purchases, starting at $9.99 per month. HMH Science Dimensions asks for nothing beyond the download.
Merge Object Viewer holds the better App Store score, 4.5 against 2.3. That said, the two scores are not equally well evidenced: Merge Object Viewer has 389 ratings behind it against 17, so its average is the more settled of the two. Written reviews point the same way: 48% of Merge Object Viewer's written reviews are positive against 25% of HMH Science Dimensions's.
Merge Object Viewer ships an update monthly, HMH Science Dimensions every 2 months. The most recent releases landed on October 13, 2026 and October 21, 2026 respectively.
| Parameter | Merge Object Viewer | HMH Science Dimensions |
|---|---|---|
| Price | Free | Free |
| Rating | 4.5 (389 ratings) — better | 2.3 (17 ratings) |
| Positive reviews | 47.6% of reviews — better | 25.0% of reviews |
| Number of ratings | 389 — better | 17 |
| Update frequency | Monthly — better | Every 2 months |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.0 | 9.0 — better |
| Further details — not scored | ||
| Size | 414 MB | 227 MB |
| Age rating | 4+ | 4+ |
| Developer | Merge Apps | Houghton Mifflin Harcourt |
Customer experience
Merge Object Viewer
HMH Science Dimensions
Bugs and requests
Merge Object Viewer
Reported bugs
4 issues- 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
5 requests- Adjustable lighting for 3D objects
- Ability to snap objects together
- Camera button for capturing scenes
- Restore VR support
- More free 3D content options
HMH Science Dimensions
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Merge Object Viewer
- Object Viewer Premium Monthly14 Days trial$9.991 Month
- Merge EDU Individual14 Days trial$9.991 Month
- Object Viewer Premium Annual14 Days trial$99.991 Year
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- Merge EDU Individual14 Days trial$99.991 Year
HMH Science Dimensions
No in-app purchases
Questions
Is Merge Object Viewer free?
Is HMH Science Dimensions free?
Which has better reviews, Merge Object Viewer or HMH Science Dimensions?
Do Merge Object Viewer or HMH Science Dimensions have ads?
Which is updated more often, Merge Object Viewer or HMH Science Dimensions?
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