Best Step File Viewer Apps

190+ iOS apps curated and reviewed

4.0 avg rating
17 free apps
Updated May 2026

The best step file viewer apps on iPhone average 4.0★ across 190+ titles — we've ranked them by what real users actually keep on their phones. Updated May 2026.

Top Picks for Step File Viewer

Autodesk Fusion#2

Autodesk Fusion by Autodesk

Strong Contender
📊 Productivity
4.5😐(4.1K ratings)
Free
Autodesk Fusion screenshot 1
Autodesk Fusion screenshot 2
Autodesk Fusion screenshot 3

Collaborate on 3D designs with anyone using Autodesk Fusion™ for iPhone and iPad. View, comment, and share 3D models in over 100 file formats, track project activities, and access design properties. Sign in with your Fusion account and start designing anytime, anywhere.

What We Love

  • 🚀 Great for showing designs
  • 👍 Easy to use and understand
  • 💡 Powerful CAD/CAM capabilities
  • 🚀 Convenient for collaboration

Room to Improve

  • 🐛 Crashes and login issues
  • 👎 Limited functionality compared to desktop version
  • 👎 Constantly logs out

More Step File Viewer apps to explore

4
3D File Viewer: OBJ STP & more
3D File Viewer: OBJ STP & more
3D File Viewer: OBJ STP & more
STP STL OBJ FBX GLTF & More
Free

View 3D models on your iPhone or iPad with support for over 20 popular file formats, including STL, OBJ, FBX, and more. Download to explore your 3D files anytime, anywhere.

🔧 Utilities
(35)
5
DWG FastView-CAD Viewer&Editor
DWG FastView-CAD Viewer&Editor
DWG FastView-CAD Viewer&Editor
* Support 2D/3D CAD formats
Free

DWG FastView-CAD Viewer allows users to view, edit, and share CAD drawings on mobile devices with ease. This intuitive app enables quick access to important design files anytime, anywhere. Access professional-grade features on-the-go and streamline your CAD workflow today.

📊 Productivity
(50)
6
STL Simple Viewer
STL Simple Viewer
STL Simple Viewer
Quickly view 3D STL CAD models
Free

View 3D STL CAD models with ease using our app. Features include support for both ASCII and Binary STL files, graphic operations for manipulation, and rendering options for detailed viewing. Contact us at support@boviosoft.com for more information.

📊 Productivity
(721)
7
AutoCAD
AutoCAD
AutoCAD
DWG Viewer & Editor
Free

View and edit AutoCAD drawings on the go! Access all DWG files, annotate, measure, and share designs easily. Download now to streamline your workflow.

📊 Productivity
(6.3K)
8
Emb3D 3D Model Viewer
Emb3D 3D Model Viewer
Emb3D 3D Model Viewer
A Powerful 3D Model Viewer
Free

Experience the power of a high-performance 3D model viewer with intuitive gestures, support for multiple formats, and enhanced visualization. Showcase your creations for fun or 3D printing with Emb3D! Explore now.

🔧 Utilities
(241)
9
Glovius - 3D CAD File Viewer
Glovius - 3D CAD File Viewer
Glovius - 3D CAD File Viewer
View CAD files on iPhone, iPad
Free

This application allows users to view, analyze, and collaborate on 3D CAD files on their iPhone or iPad, supporting various file formats. With this app, users can view and interact with 3D models, take measurements, run reports, and share feedback with their team, making it a perfect tool for on-the-go collaboration and design review.

🔧 Utilities
(1)
10
Any: File Explore & Viewer
Any: File Explore & Viewer
Any: File Explore & Viewer
Explore, Search, View Files
Free

This all-in-one file management app helps you efficiently access, view, share, and organize your files, media, and contacts in one place, making it easier to manage your digital life. Download now to unlock features like universal file access, multi-window support, and seamless media playback, and take control of your digital world.

🔧 Utilities
(124)
11
3D Model Viewer - AR View
3D Model Viewer - AR View
3D Model Viewer - AR View
View model in AR and 3D mode
Free

View and interact with various 3D models in AR and 3D mode using this advanced model viewer. Enjoy features like custom backgrounds, shadow casting, and support for multiple file formats. Share and save screenshots, access files locally or from the cloud, and get detailed model information. For feedback or support, email belighten@gmail.com.

📊 Productivity
(323)
12
File Manager & Browser
File Manager & Browser
File Manager & Browser
Manage Files & Documents
Free

A powerful tool for organizing and managing files across devices with ease. Simplify your file management experience and stay organized effortlessly.

🔧 Utilities
(51K)
13
IGES & STEP Viewer
IGES & STEP Viewer
IGES & STEP Viewer
View and export 3D CAD files
$7.99
$9.99 | 20% OFF

This application allows users to quickly view and export 3D CAD files in various formats, offering features such as rendering control, model info, and graphic operations. Try it now to easily open, view, and export your IGES and STEP model files to popular CAD formats.

📊 Productivity
(8)
14
FE File Explorer Pro
FE File Explorer Pro
FE File Explorer Pro
Access files on computer & NAS
$4.99

Access and manage files on your computer from your mobile device. Organize, transfer, and view files seamlessly with easy-to-use functionality. Explore a new way to handle your files on the go!

🔧 Utilities
(5.8K)
15
RAR Unzip-Zip File Opener 7Zip
RAR Unzip-Zip File Opener 7Zip
RAR Unzip-Zip File Opener 7Zip
Zip Extractor & RAR Extractor
Free

Discover new recipes, plan your meals, and organize your grocery list with this all-in-one cooking companion. From browsing diverse dishes to creating customized meal plans, simplify your kitchen experience today!

🔧 Utilities
(2.8K)
16
iFile
iFile
iFile
Your file manager
$4.99

Discover a multifunctional file manager for iOS that combines file work, browsing, and media viewing. With features like file customization, Bluetooth/WiFi transfer, and PDF viewing, this application offers seamless file management and organization on your iPhone or iPad. Explore a world of convenient file handling and browsing with just one app.

🔧 Utilities
(0)
17
SketchUp - 3D Modeling
SketchUp - 3D Modeling
SketchUp - 3D Modeling
Interior Design & Architecture
Free

Design and visualize 3D models easily with this intuitive application for architects and designers. Start bringing your ideas to life in three dimensions now!

🎨 Graphics & Design
(17K)
18
Documents: File Manager & Docs
Documents: File Manager & Docs
Documents: File Manager & Docs
Converter. Downloader. Reader.
Free

Manage and organize all your files efficiently with our user-friendly file manager. Easily categorize, search, and access your documents on the go. Simplify your file management tasks today.

📊 Productivity
(616K)
19
ES File Explorer
ES File Explorer
ES File Explorer
Browse & Music, Docs
Free

Discover a comprehensive file management tool with powerful features for browsing, managing, and organizing files on your device efficiently. Download now to streamline your file management tasks with ease.

📊 Productivity
(15K)
20
Owlfiles - File Manager
Owlfiles - File Manager
Owlfiles - File Manager
Access SMB WebDAV FTP and S3
Free
🔧 Utilities
(7.1K)