3D PDF Viewer vs 3D CAD Model Viewer
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
3D PDF Viewer
View and interact with 3D models embedded in PDF files on your mobile device. Easily zoom, pan, and rotate models using intuitive multi-touch gestures. Load files directly from cloud storage services like Dropbox and Google Drive.
- 3D PDF model rendering (.prc)
- Multi-touch gestures (zoom, pan, rotate)
- Import from cloud storage
- Open password-protected PDFs
- Integrated Box and Dropbox browsing
- Supports meshes and colors
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3D PDF Viewer is a lightweight 3D PDF document viewer with powerful capabilities. 3D PDF Viewer extends the use of 3D PDF to mobile devices by providing the user ability to view and interact with 3D models stored in 3D PDF files. User can easily zoom, pan and rotate 3D model with multi-touch gestures. The application recognises .pdf file extension and user can choose to load .pdf files into this application directly from other applications like email client, web downloads, FTP, Dropbox, Google Drive, Box and any other cloud storage applications. 3D PDF Viewer is integrated with Box and Dropbox cloud storage allowing user to directly browse files on Box.com and Dropbox.com storage in the application itself. Three sample 3D PDFs are bundled with the application. 3D PDF Viewer current version contains following features: - 3D PDF model rendering (.prc files) - Multi-touch gestures like zoom, pan, rotate and fit to screen - Import models from email attachment, Dropbox, Google Drive, Box or any other cloud storage application. - Open password protected pdf files. - Easy file browsing for Box and Dropbox user (Box and Dropbox cloud storage is natively integrated with the application). - Supports meshes and colors. Please do send your feedback to us 3DPDFViewer.iOS@ProtoTechSolutions.com
3D CAD Model Viewer
Easily view, analyze, and share 3D CAD models and drawings from various file formats. Organize your models into a catalog for quick reference and access job information. Streamline your quoting process by leveraging past projects and profitability data.
- View models from any angle
- Apply bounding box for measurements
- Markup and annotate models
- Build a catalog of models
- Translate models to STL, STEP, 3D PDFs
- Share models via email or Slack
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View, analyze, markup, translate and share any 3D CAD model or drawing including dwg, catia, x_t, stp, igs files and more. Files can be opened directly from email, Dropbox or Google Drive. Once you upload a model into your app, you can easily: - View the model from any angle, zoom in and rotate - Apply a bounding box for quick measurements - Markup and make annotations - View job information on models - Email the model directly from the app. Recipients can view and rotate the model from their email - no need to create their own account. Links to the model can also be sent via Slack or any other app. - Build a catalog of models for future reference - Log into the free app from your computer and translate your models from any format into stl, step and 3D pdfs. We help machine shops increase profitability by cataloging and enabling instant search of your library of previous work, capturing all of your quotes and models in one place for immediate recall. Instantly know if you won the previous bid, and if so, how profitable the job was. With that formerly tribal knowledge captured, cataloged and searchable, you’ll quote faster, work more efficiently, and manufacture more profitably. Most organizations still develop quotes and estimates semi-manually. They lack the tools to view a CAD drawing or model, instantly search their catalog for previous models and quotes to use as templates, and easily see if those previous models were profitable. It’s the 21st century, but most still quote like it’s 1995. Machine Research provides the automation tools to catalog your models for instant search based on desired parameters. From the catalog, you’ll have all the job information associated with making the part that’s easily accessible and sharable for the whole team. Machine Research takes the knowledge from your employees’ heads, and catalogs and automates it to make your quoting process faster and more efficient, and your business more profitable.
Screenshots
Verdict
The clearest difference is rating: 3D CAD Model Viewer at 3.3 against 3D PDF Viewer's 1.5. 3D CAD Model Viewer also leads on review sentiment (40% vs 0%) and update cadence (every 5 weeks vs every 10 months). On price, ads, in-app purchases and monetization model 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. Neither carries in-app purchases, so what you see is what you pay.
3D CAD Model Viewer holds the better App Store score, 3.3 against 1.5. That said, the two scores are not equally well evidenced: 3D CAD Model Viewer has 13 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 0% of 3D PDF Viewer's written reviews are positive against 40% of 3D CAD Model Viewer's.
3D PDF Viewer ships an update every 10 months, 3D CAD Model Viewer every 5 weeks. The most recent releases landed on October 16, 2026 and October 5, 2026 respectively.
| Parameter | 3D PDF Viewer | 3D CAD Model Viewer |
|---|---|---|
| Price | Free | Free |
| Rating | 1.5 (2 ratings) | 3.3 (13 ratings) — better |
| Positive reviews | 0.0% of reviews | 40.0% of reviews — better |
| Number of ratings | 2 | 13 — better |
| Update frequency | Every 10 months | Every 5 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.6 | 10.0 — better |
| Further details — not scored | ||
| Size | 21 MB | 50 MB |
| Age rating | 4+ | 4+ |
| Developer | ProtoTech Solutions and Services Pvt. Ltd. | Machine Research Corporation |
Customer experience
3D PDF Viewer
3D CAD Model Viewer
In-app purchases
3D PDF Viewer
No in-app purchases
3D CAD Model Viewer
No in-app purchases



