CADViewer by Orua vs DWG FastView

CADViewer by Orua is a free, open-source browser viewer for large engineering drawings and read-only previews. It opens DWG, DXF, STL, STEP/STP, IGES/IGS, and BREP/BRP files through one entry point and toolbar. DWG and DXF files are parsed in a Web Worker with LibreDWG WebAssembly and rendered progressively using Canvas 2D and Path2D. Three-dimensional formats use OpenCascade WebAssembly and WebGL, with selectable metal surface finishes. Controls include pan, wheel zoom, fit-to-view, zoom window, drawing-list visibility, and light or dark backgrounds. Fonts can load on demand, and deployment configuration supports Simplified Chinese and English. The viewer runs on a static web server without an application server or database, with offline or private-network options. Locally selected files stay in browser processing without an account or upload API. It is read-only and lacks editing, property panels, selection workflows, and plugins.

DWG FastView is CAD software for opening, editing, measuring and sharing drawing files across Android, iOS, web, Windows and self-hosted environments. It supports DWG, DXF, DWF and DWFx, with tools for 2D editing and viewing 3D formats such as RVT, STEP and IFC. Layer and layout controls sit alongside length and area measurements, annotations, dimensions and PDF-to-DWG conversion. DWG drawings can be exported to PDF, JPEG, PNG or BMP. Sharing is available by link, group or email, with permission controls; the maker says the web viewer can open local drawings in the browser without uploading them. Its enterprise CAD SDK is described as supporting private deployment on Windows and Linux servers, plus integrations with web disks, office automation, ERP, file and archive managers, and project or engineering management systems. A free plan and trial are available. Listed mobile subscriptions include Premium at $3.99 a month and Super at $5.83 a month; the pricing note also lists paid access from $7.99/user/mo. Expired subscribers can continue using the software without premium features.