STL to STEP Assistant

Mesh Models to STEP Files

Free · In‑App Purchases

Convert STL, GLB, and OBJ models to STEP offline and privately. STL to STEP Assistant is a focused local 3D model tool for converting mesh-based models into STEP files for CAD workflows. Open STL, STLB, GLB, 3MF, USDZ, OBJ, 3DM, FBX, DAE, PLY, 3DS, AMF, DRC, KMZ, MPD, WRL, and other model files, preview them in a clean 3D scene, choose a conversion quality mode, then export and save the current main model as a STEP file. You can also load and view STEP and STP files to inspect conversion results. Built for mesh-to-STEP work - Convert STL, including binary STLB, to STEP - Convert OBJ, GLB, GLTF, 3MF, 3DM (Rhino), FBX, DAE, PLY, USDZ, 3DS, AMF (additive manufacturing), DRC (Draco), KMZ (zipped 3D scene), MPD (multi-part LDraw), and WRL (VRML) model formats to STEP - Load and view STEP files to inspect conversion results - Export STEP with BRep reconstruction, useful for turning some engineering mesh models into easier-to-edit CAD surfaces - Preview 3D models and BRep reconstruction results before export - Export the current main model, not the whole scene or other objects - Keep floor, lights, camera, and visual effects out of the STEP file - Process files on device, so model data stays on your device - Privacy focused, with no account, no login, no ads, no tracking, and no data collection Choose STEP export geometry and quality as needed - BRep: tries to convert suitable mesh models into easier-to-edit CAD surfaces, useful for some engineering parts and regular geometry - Faceted Small: fast, lightweight STEP export for everyday use - Faceted Balanced: balance detail and file size - Faceted High: preserve more model detail - Faceted Original: export as directly from the source mesh as possible Understand the result before saving - View source file information - Review mesh, triangle, and vertex counts - Check triangle reduction by quality mode - Get a simple export risk hint - See the final STEP file size after conversion It is made for makers, engineers, designers, 3D printing users, CAD users, and anyone who needs to convert mesh models into STEP exchange files. Pricing & Access - Free: Open, preview, inspect models, load STEP files, and use Small STEP export. - CAD Surface Export unlocks BRep STEP export for suitable models, helping produce easier-to-edit CAD surface results. - In-App Purchase unlocks: Permanently unlock CAD Surface Export, Balanced, High, Original, and other STEP export capabilities. No subscription required. - Payment is charged to your App Store account. - Purchases can be managed through your App Store account settings. Privacy & Purchase Terms - Privacy Policy: https://h53d.github.io/s2s/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.

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- Improved surface reconstruction for STEP conversion, reducing fragmented faces and gaps in some models and helping more models convert into closed solids. - Improved previews for complex models with clearer progress updates and an option to cancel. - Added conversion quality information and region details to help you inspect areas that remain triangulated. - Improved validation before export for more reliable STEP files.

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

    The developer has not yet indicated which accessibility features this app supports. Learn More

    Seller
    维 艾
    Size
    36.6 MB
    Category
    Developer Tools
    Compatibility
    Requires iOS 17.6 or later.
    • iPhone
      Requires iOS 17.6 or later.
    • iPad
      Requires iPadOS 17.6 or later.
    • Mac
      Requires macOS 14.6 or later.
    • Apple Vision
      Requires visionOS 1.3 or later.
    Languages
    English and 4 more
    • English, French, German, Japanese, Simplified Chinese
    Age Rating
    4+
    In-App Purchases
    Yes
    • Unlock CAD Surface Export $9.99
    • Unlock Faceted STEP Quality $6.99
    Copyright
    © 2026 aiwei