CAD Viewer vs DWG FastView

CAD Viewer is a free, open-source browser WebGL runtime for viewing and editing DWG and DXF drawings. It displays model space, layouts, layers, blocks, and external references. Write mode supports creating, editing, and deleting drawing entities with AutoCAD-style commands. Review tools place arrows, text, clouds, rectangles, circles, and callouts over a read-only drawing background. Measurement tools cover distance, area, angle, and arc length, with results exportable as a JSON sidecar file. The product can export a self-contained HTML viewer for offline use with pan, zoom, layers, and distance measurement; exports can be password- and expiry-protected. Full-viewer examples include HTML and PDF export, while the simple viewer offers lazy-loaded HTML, PDF, and SVG plugins. Parsing and rendering occur on the client, and drawings are not uploaded, cached, or mirrored to a server. It can be embedded through iframe or npm, and a Google Drive integration opens drawings from Drive. The responsive interface supports phones, tablets, and desktops, with touch operations documented for mobile. Read-only mode disables markup, drawing, and modification commands.

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.