Measure dimensions and angles in STEP models, review AP242 PMI, and inspect details with projected, section, and exploded views—even on iPhone.
STEP File Viewer is a lightweight yet powerful tool for viewing .step and .stp files on macOS, iPad, and iPhone.
Key Features
• View STEP models in 3D with rotate, pan, and zoom controls using perspective projection.
• Display 3D models in solid, shaded, or wireframe modes.
• Load and view IGES/IGS models.
• Supports assembly-level colors and exploded views (requires the model to include assembly data).
• Parse and load STEP models as assemblies
• Support PMI annotations, dimension details, and model information panels in AP242 models for easier design review.
• Measure auto-detected hole features, bounding box dimensions, point-to-point distances, diameter/radius, and angles to verify key dimensions more quickly.
• Apply axis-aligned section planes (XY, XZ, YZ) to reveal the model’s internal geometry.
• Explode model components to inspect the parts clearly in expanded space, with the ability to export selected parts as separate files.
• Export 3D models in STL, OBJ, glTF, GLB, or USDZ formats for further use or sharing.
• Capture high-quality viewport screenshots for easy sharing.
• No ads. No tracking. No data collection. Just a clean, efficient tool built for productivity.
The STEP format (ISO 10303) is widely supported by 3D CAD, CAM, CAE, and PLM applications.
Recommended For:
• Engineers & Designers: Review designs on the shop floor or during client meetings.
• Machinists & CNC Operators: Quickly verify part geometry before production.
• 3D Printing Enthusiasts: Easily convert professional STEP files to STL for slicing.
• Students & Educators: Visualize complex structures without expensive CAD licenses.
Pricing & Access
• Free: Load and view unlimited STEP models.
• Subscription: Unlimited access to all features. A single subscription covers macOS, iPhone, and iPad.
• Individual Unlocks: Get exactly what you need with one-time purchases for specific features—no subscription required.
• Payment is charged to your App Store account.
• Auto-renews unless turned off at least 24 hours before the current period ends.
• Manage your subscriptions in the App Store settings.
Privacy & Purchase Terms
• Privacy Policy: https://h53d.github.io/step/policy.html
• Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Have questions or need support? Reach out to danjian42@gmail.com.
No true orthographic, cross sections don't work well
Lexor Pontificus
This is FAR better than eDrawings, but doesn't have true 3d orthographic, the orbit camera view frequently freezes, and there's no wireframe solid view
Developer Response
Thank you for your feedback.Indeed, I didn't consider implementing orthographic projection view when developing the app; currently, only perspective view is supported. Based on your feedback, orthographic projection view seems to be a requirement, and this feature will be considered in future versions.Wireframe is supported. You can switch between Solid, Shaded, and Wireframe render modes by repeatedly clicking the first icon in the second row of the icons area at the bottom left of the view.Regarding the "the orbit camera view frequently freezes," please describe in detail the specific circumstances under which you encountered this issue so I can reproduce, debug, and fix it.Thank you again for your feedback; I will continue to improve the app.
Can’t see all step files in a folder
JustSomeHumsn
The app requires authorization (?) to open step files. It is unclear how to provide authorization to all step files in a folder recursively. In addition trying to open a folder contained within an enclosing folder only shows some of the folders.These problems make the app useless.
Developer Response
Currently, batch opening by folder authorization is not supported; only opening one file at a time is supported: select the target file and then click "Authorize".I don't understand the specific scenario described by "In addition trying to open a folder contained within an enclosing folder only shows some of the folders." Could you please email danjian42@gmail.com for further feedback?Thank you for your feedback; I will continue to improve.
- Added per-file deletion in the recent files list, plus confirmed clear-all when the list gets longer, making import history easier to manage
- Improved STEP color loading, including XCAF, instance, face-level, and subshape colors, reducing gray or mismatched colors in colored models
- Improved view reset: tap the quick action icon to return directly to the default view without an extra confirmation prompt
Version 1.0.10
The developer, 维 艾, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Privacy practices may vary, for example, based on the features you use or your age. Learn More
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
Seller
维 艾
Size
33.4 MB
Category
Developer Tools
Compatibility
Requires iOS 16.0 or later.
iPhone Requires iOS 16.0 or later.
iPad Requires iPadOS 16.0 or later.
Mac Requires macOS 12.0 or later.
Apple Vision Requires visionOS 1.0 or later.
Languages
English and 4 more
English, French, German, Japanese, Simplified Chinese
