Digit 3D: CAD Viewer & Editor

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About this app

Open STEP, IGES, STL, OBJ and DXF files on your phone — then actually change them.

Digit 3D is a complete parametric CAD workspace with a real solid modelling kernel, running entirely on your device. No account, no cloud, no ads.

VIEW AND INSPECT
• Open STEP / STP, IGES / IGS, STL, OBJ and DXF
• Rotate, zoom, isolate and hide parts; set per-face colours
• Cut along any plane with a draggable section gizmo
• Measure distance, angle, radius, area and local curvature
• Body properties: volume, bounding size, surface area, plus weight and cost from 20 built-in materials
• Draft angle and wall thickness analysis with colour banding

3D MODELING
• Parametric sketches with geometric and dimensional constraints
• Extrude, revolve, sweep, loft through curves and surface fill
• Boolean union, subtract and intersect across multiple bodies
• Fillet, chamfer, shell, draft and curvature-continuous blends
• Linear, circular and mirror patterns; move, copy and rotate bodies
• Synchronous editing — push, pull and offset faces on imported geometry
• Datum planes, sketch on any face, and raster image underlays for tracing
• Full feature tree with rollback, edit and multi-step undo

2D DRAWINGS FROM YOUR MODEL
• Three-view and isometric layouts generated from the 3D model
• Section views, detail views and centrelines
• Automatic dimensioning, manual dimensions and tolerances
• Text notes and leaders
• Standard title block and multi-page sheets
• Export to DXF or PDF

2D DRAFTING
• Lines, polylines, rectangles, circles, arcs and precise geometry
• Aligned, linear, radius, diameter and angle dimensions
• Object snaps, layers, layer visibility and measuring tools
• Export as DXF or PNG

BUILT FOR REAL INPUT
• Full mouse support with the button mapping professional CAD users expect
• Configurable keyboard shortcuts across model and sketch modes
• Radial command menu for fast tool access
• Phone and tablet, portrait or landscape
• Guided interface tour, step-by-step tutorials, and long-press help on any tool

FILE EXCHANGE
• Import STEP, IGES, STL, OBJ and DXF
• Append imported geometry into an existing model
• Export STEP for CAD exchange and STL for 3D printing
• Export drawings as DXF and PDF
• Editable projects are saved locally in the MCAD format with full history

What’s new

• Assemblies: place parts, add mates, explode, check interference
• Motion study: seven joint types plus motors, on a timeline you can scrub
• Hole command; pattern or mirror a whole feature; sketch axis guides; fillet many edges at once
• Edit imported geometry directly: move, offset, replace and extend faces
• Import Parasolid X_T; DXF now reads REGION and 3D solids, and opens very large drawings
• Fixes: incomplete STEP parts, revolve faceting, fillets, sketch drag