Easily open and explore 3D model files on your iPhone or iPad. Supports over 20 popular formats, offering smooth viewing with intuitive touch controls. Ideal for designers, engineers, architects, and students working with 3D data.
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.
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.
Are there free stp file apps for iPhone?
Yes — 18 of the top stp file apps we rank are free to download, including 3D File Viewer: OBJ STP & more and STEP Viewer.
Does 3D File Viewer: OBJ STP & more have ads or in-app purchases?
3D File Viewer: OBJ STP & more has no ads and offers in-app purchases, according to its App Store listing as of June 2026.
How many stp file apps are on the App Store?
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.
What 3D file formats does 3D File Viewer support?
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.
What are the subscription options for 3D File Viewer?
3D File Viewer offers two subscription plans to remove ads: a monthly plan for $3.99 and an annual plan for $29.99.