STEP Reviewer Pro
100MB+ STEP · 1M+ Facets
Free · In‑App Purchases
Built for CAD review: STEP files in the hundreds of MB and faceted models above 1 million triangles, plus measurement, cross sections, and mesh export.
STEP Reviewer Pro is a native STEP file viewer and 3D CAD review app for Mac, iPhone, iPad, and Apple Vision Pro. Open STEP/STP assemblies locally, with IGES import as an optional unlock. Inspect parts, cross sections, and engineering data without uploads. Measurement is available on iOS and macOS.
Key features:
- Open STEP (.step, .stp) files locally, with optional IGES (.iges, .igs) import
- Browse assemblies, focus components, and control node visibility
- Rotate, pan, zoom, reset, and focus models or components
- Match source orientation with X-Up, Y-Up, or Z-Up
- Inspect dimensions, statistics, names, colors, materials, and supported PMI/GD&T
- Measure points, edges, faces, distances, angles, radii, and diameters on iOS and macOS
- Create filled XY, XZ, or YZ cross sections and inspect internal geometry
- Separate assembly components with Exploded View
- Capture screenshots with arrows, rectangles, text annotations, and optional watermarks
- Record review videos with microphone narration and watermarks
- Export tessellated geometry as STL, GLB, USDA, USDC, or USDZ
- Export individual parts from the model tree: select the app icon beside an exportable part node and choose STL, GLB, Faceted STEP, USDA, USDC, or USDZ
- Review 3D CAD models in an immersive spatial experience on visionOS
- No ads, account registration, behavioral analytics, or model upload for viewing
Designed for engineers, manufacturing and quality teams, suppliers, buyers, and customers reviewing STEP, STP, or IGES models and sharing measurements, sections, screenshots, or recordings.
Common questions:
- Does STEP Reviewer Pro support IGES files?
Yes. IGES and IGS model import is available as an optional unlock.
- Can I measure STEP models?
On iOS and macOS, free users can keep two results. Unlimited Measurements removes that limit. Measurement and spatial PMI are unavailable on visionOS.
- Can STEP models be exported to STL, GLB, or USDZ?
Yes. STL, GLB, USDA, USDC, and USDZ contain tessellated geometry, not exact B-rep surfaces, feature history, constraints, or PMI.
- Are CAD files uploaded to a server?
No. Import, review, measurement, capture, and export run on device. Local viewing needs no cloud conversion or account. You choose where to save or share.
- Is STEP Reviewer Pro a CAD editor?
No. It is a read-only STEP/IGES viewer, not a CAD authoring or repair system. Source files are unchanged.
Pricing & Access
- Free: Open STEP files, browse assemblies, inspect model information, and keep two measurements on iOS and macOS.
- Subscription: Unlock all current Pro tools while active across supported platforms with the same Apple Account.
- Individual Unlocks: Make one-time purchases for import, inspection, capture, or export tools.
- Payment is charged to your App Store account.
- Subscriptions renew automatically unless auto-renew is turned off at least 24 hours before the current period ends.
- Manage or cancel subscriptions in your App Store account settings.
Privacy & Terms
- Purchases, subscriptions, refunds, and restores are handled by Apple through your App Store account.
- Privacy Policy: https://h53d.github.io/sr/policy.html
- Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Need help or have feedback? Email danjian42@gmail.com or visit https://h53d.github.io/sr/support.html.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
- Added part export from the model structure tree. You can export selected parts as STL, GLB, Faceted STEP, USDA, USDC, and USDZ.
- Added "Rate App" and "Share STEP Reviewer" actions.
- Improved the recent files panel on macOS by moving "Open New File" into the recent files list.
- Improved Exploded View: when a model cannot be exploded, the app now shows a clear message instead of appearing unresponsive.
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.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- 维 艾
- Size
- 41.5 MB
- Category
- Graphics & Design
- Compatibility
Requires iOS 26.0 or later.
- iPhone
Requires iOS 26.0 or later. - iPad
Requires iPadOS 26.0 or later. - Mac
Requires macOS 26.0 or later. - Apple Vision
Requires visionOS 26.0 or later.
- iPhone
- Languages
English and 6 more
- English, French, German, Japanese, Korean, Simplified Chinese, Traditional Chinese
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Parts Export $24.99
- USDZ Export $6.99
- USDC Export $6.99
- USDA Export $6.99
- GLB Export $19.99
- STL Export $19.99
- IGES Model Import $14.99
- Unlimited Measurements $24.99
- Exploded View $24.99
- Screen Recording $14.99
- Copyright
- © 2026 aiwei
