# STEP File Viewer — View & Explore STEP/IGES

> 3D CAD file viewer for STEP and IGES models on Apple devices. (iPhone/iPad app by 维 艾.)

- Source: https://appshunter.io/ios/app/step-file-viewer/id6755721056 (this page in markdown: same URL + `.md`)
- Developer: [维 艾](https://appshunter.io/developer/1771300149)
- Category: Developer Tools, Productivity
- Price: Free with in-app purchases
- Rating: 4.00/5 from 4 App Store ratings · 7 written reviews indexed
- Age rating: 4+
- Requires: iOS 16.0 · 32 MB
- Languages: American English, French (France), German (Germany), Japanese, Chinese (Simplified, China)
- Released: 2025-12-08
- Data updated: 2026-08-23
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/step-file-viewer/id6755721056/reviews.md

## What is STEP File Viewer?

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.

## Key features

- 3D model viewing with pan, zoom, and rotate
- Solid, shaded, and wireframe display modes
- Measure dimensions and features
- Section planes for internal geometry inspection
- Export models to STL, OBJ, glTF, and more
- Supports assembly data and PMI annotations

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| Pro Flex | $1.99 | per 7 days |
| Pro Infinity | $19.99 | per year |

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Projection view generation & export | $4.99 | one-time |
| Export as OBJ | $3.99 | one-time |
| Export as STL | $3.99 | one-time |
| Export as PNG | $2.99 | one-time |
| Export all formats | $15.99 | one-time |
| Cross Section View | $4.99 | one-time |
| IGES/STEP Model Import | $3.99 | one-time |
| Exploded View | $4.99 | one-time |
| Export as USDZ | $1.99 | one-time |


## Recent user reviews (7 of 7)

All indexed reviews: https://appshunter.io/ios/app/step-file-viewer/id6755721056/reviews.md

### 5/5 — Great Software and software support

*2026-07-10*

They have fixed bugs, instant response from developers, and support team.

**Developer response:** Thank you for your valuable feedback! We are pleased to inform you that most of your concerns have been addressed in our latest update (v1.0.11):

1, STEP/STP Export: You can now export parts in STEP (BRep) format.

2, Exploded View Control: We have added a radius setting to the exploded view, giving you precise control over the distance between objects.

3, Component visibility control is fully supported. You can easily hide unwanted parts by using the model structure tree nodes under "Model" in the sidebar. This will allow you to inspect the components hidden behind them.

4, Regarding STL support: The core design and focus of this app is strictly dedicated to the high-fidelity loading and parsing of STEP models. Because STL files handle data quite differently (mesh vs. boundary representation), adding STL parsing is currently not aligned with our focus on optimizing the STEP model experience.

We highly recommend updating to v1.0.11 to try out these new features. Thank you for helping us improve!

### 4/5 — 卡顿

*2026-05-21*

放大缩小   放着放着不见了      旋转也卡的很   翻不动

**Developer response:** 屏幕左下方快捷按钮，第一排倒数第二个是重置按钮-专们用来解决缩放后看不到的，有使用么？

1.0.9版本(已于6月3日发布上线)对操作卡顿的现象进行了一轮优化。欢迎再次使用、反馈，任何建议随时可以发到开发者邮箱 danjian42@gmail.com

感谢您的反馈：）

### 5/5 — 一般看图足够了

*2026-05-01*

一般看图足够了

### 5/5 — good for checking out the model

*2026-04-23*

recommended

**Developer response:** Thanks.

### 1/5 — Can’t see all step files in a folder

*2026-04-01*

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.

### 5/5 — Top

*2026-03-12*

Sehr gute App, sehr benutzerfreundlich!

**Developer response:** Vielen Dank! 😊 Es freut uns sehr, dass dir die App gefällt.

### 3/5 — No true orthographic, cross sections don't work well

*2026-03-06*

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.

## Frequently asked questions about STEP File Viewer

### What is STEP File Viewer?

STEP File Viewer is a tool for macOS, iPad, and iPhone that allows you to view and interact with 3D CAD files in STEP and IGES formats. It offers features like measurement, sectioning, and export to other common 3D formats.

### Does STEP File Viewer have ads?

No, STEP File Viewer is ad-free. The developer explicitly states 'No ads. No tracking. No data collection.' for a clean user experience.

### What devices does STEP File Viewer support?

STEP File Viewer is available on macOS, iPhone, and iPad. A single subscription covers all supported Apple devices.

### How much does STEP File Viewer cost?

The app offers a free tier for loading and viewing unlimited STEP models. Additional features are available through individual unlocks or a subscription, with pricing details provided in the app.

### Can I measure dimensions with STEP File Viewer?

Yes, STEP File Viewer allows you to measure auto-detected hole features, bounding box dimensions, point-to-point distances, diameter/radius, and angles to verify key dimensions.

### What file formats can I export from STEP File Viewer?

You can export your 3D models from STEP File Viewer in STL, OBJ, glTF, GLB, or USDZ formats. This allows for further use in other applications or sharing.

### How often is STEP File Viewer updated?

The latest version of STEP File Viewer is 1.0.10, and it was last updated on June 14, 2026. This indicates a recent update, suggesting ongoing development and support.

### What are the subscription options for STEP File Viewer?

STEP File Viewer offers a 'Pro Flex' subscription at $1.99 per 7 days with a 3-day free trial, and a 'Pro Infinity' subscription at $19.99 per year. Subscriptions auto-renew unless turned off 24 hours prior to the end of the current period.

## Version history (last 5 releases)

### 1.0.13 — 2026-07-29

- Improved model zoom control for smoother mouse wheel and trackpad zooming, making view adjustments more precise.
- Improved the recent files list with quick filename filtering and a clearer Clear All action.
- Improved STEP file compatibility, fixing some models that failed to load or showed abnormal faces and holes.

### 1.0.12 — 2026-07-11

- View orientation has been optimized for the Z-up convention commonly used in industrial and mechanical CAD.
- The bottom-right ViewCube has been further improved, keeping standard views, rotate, roll, and reset actions in sync with the model view.

### 1.0.11 — 2026-07-06

- Added exploded-parts faceted STEP export — save each exploded part as a separate STEP file, with batch export to a single folder
- Added an explosion radius slider (1×–20×) to the exploded-parts panel
- Replaced the corner view helper with a new view cube — tap faces for front, top, side, and other standard views; use the surrounding buttons to rotate and roll the model

### 1.0.10 — 2026-06-14

- 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

### 1.0.9 — 2026-06-02

- New hole feature auto-detection and measurement — scan all circular holes in the model with one tap, with quick diameter/radius annotation
- New bounding box measurement — automatically calculate length, width, height, and volume of parts or assemblies
- New assembly part recognition scan — measure part bounding box dimensions with one tap
- Exploded view now supports exporting selected parts to separate files; the part list panel allows quick switching and locating of part views
- Improved measurement focus camera — one tap to auto-adapt to the optimal viewing angle
- Exploded view measurement rules now restrict measurements to within the same part, preventing cross-part annotation misalignment
- New PMI/GD&T information browser panel (located in the sidebar's Model tab), supporting filtering by type, source, and confidence level to explore product manufacturing information

## More apps by 维 艾

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All apps by 维 艾: https://appshunter.io/developer/1771300149

## Related topics

[step file viewer](https://appshunter.io/ios/topics/step-file-viewer)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-23.*