Best Stp File Apps

31+ iOS apps curated and reviewed

3.7 avg rating
18 free apps
Updated June 2026

Out of 31+ stp file apps on iOS, 18 are free and the rest sit in the paid tier. This page sorts them so you can compare both sides before you commit.

Compare top Stp File Apps (June 2026)

#AppPriceRatingAdsIn-App PurchasesUpdated
13D File Viewer: OBJ STP & more3D File Viewer: OBJ STP & moreFree4.5★ (48)NoYesSep 2026
2STEP ViewerSTEP ViewerFree—NoNoSep 2026
3DWG FastView-CAD Viewer&EditorDWG FastView-CAD Viewer&EditorFree4.5★ (1.1K)YesYesSep 2026
4AutoCADAutoCADFree4.4★ (6.3K)NoYesSep 2026
53D CAD Model Viewer3D CAD Model ViewerFree3.3★ (13)NoNoMay 2026
6Glovius - 3D CAD File ViewerGlovius - 3D CAD File ViewerFree1.0★ (1)NoYesJul 2026
7STL File Viewer ProSTL File Viewer ProFree4.5★ (65)YesYesSep 2026
8iFTP Pro - The File Transfer, Manager and EditoriFTP Pro - The File Transfer, Manager and EditorFree2.1★ (10)NoNoMay 2026

Top Picks for Stp File

DWG FastView-CAD Viewer&Editor#3

DWG FastView-CAD Viewer&Editor by Gstarsoft Co., Ltd

* Support 2D/3D CAD formats
Worth Considering
📊 Productivity
4.5😐(1.1K ratings)
FreeAdsIn-App Purchases
DWG FastView-CAD Viewer&Editor screenshot 1
DWG FastView-CAD Viewer&Editor screenshot 2
DWG FastView-CAD Viewer&Editor screenshot 3
DWG FastView-CAD Viewer&Editor screenshot 4
DWG FastView-CAD Viewer&Editor screenshot 5
DWG FastView-CAD Viewer&Editor screenshot 6

This cross-platform CAD application allows users to view, edit, and create 2D and 3D designs on the go. It supports a wide range of file formats and offers advanced tools for precise drawing, measurement, and annotation, even offline.

What We Love

  • 🚀 Fast and efficient
  • 👍 Easy to use and intuitive
  • 💡 Convenient mobile CAD viewing and editing
  • 🚀 Quick file loading
  • 👍 Smooth performance
  • 👍 Accurate measurements and annotations
  • 💡 Useful PDF export feature

Room to Improve

  • 🐛 Crashes and freezes
  • 💰 Subscription model with limited free features
  • 🔒 Lack of customer support and communication
  • 🔒 Unclear upgrade and purchase process
  • 🔒 Aggressive advertising and paywalls
  • 🔒 Unreliable file compatibility and opening

More Stp File apps to explore

FAQ about Stp File

What are the best stp file apps for iPhone?
3D File Viewer: OBJ STP & more tops our stp file apps ranking as of June 2026, with a 4.5-star average from 48 App Store ratings, and it's free to download.
Yes — 18 of the top stp file apps we rank are free to download, including 3D File Viewer: OBJ STP & more and STEP Viewer.
3D File Viewer: OBJ STP & more has no ads and offers in-app purchases, according to its App Store listing as of June 2026.
We track 31+ stp file apps on the iOS App Store as of June 2026, ranked by rating, recency, and analysis of real user reviews.
3D File Viewer supports over 20 popular 3D file formats, including STL, OBJ, FBX, GLTF, PLY, 3DS, DAE, STP, IGES, IFC, 3MF, AMF, BIM, BREP, FCSTD, 3DM, OFF, and WRL.
3D File Viewer offers two subscription plans to remove ads: a monthly plan for $3.99 and an annual plan for $29.99.