PartLens: STEP & CAD Viewer

PartLens is an offline STEP viewer and CAD viewer for Android. Open STEP and STP files, CATIA files (CATPart and CATProduct), 3DXML, IGES, STL, OBJ, PLY, glTF and DXF on your phone or tablet, measure a hole with one tap, and cut live sections. Your CAD files are processed on the device and never uploaded.

Free to use. No CAD upload. No login. No ads.

OPEN THE FILES YOU RECEIVE
• STEP viewer and STP viewer: parts and full assemblies, with real part names and colours
• CATIA file viewer: open CATPart files without CATIA, and CATProduct assemblies with every part placed and named as in CATIA's tree. PartLens asks once for the folder that holds an assembly's parts, or opens one .zip of it
• 3DXML viewer: .3dxml exports from CATIA and 3DEXPERIENCE open with their product tree
• IGES / IGS surfaces and curve files, and DXF drawings with blocks, dimensions and text
• STL viewer and OBJ viewer for 3D-print and scan files, plus PLY point clouds and GLB / glTF 3D models with textures
• Native .partlens projects that reopen instantly with your measurements, notes and views
• Large die, mould and fixture assemblies load progressively; very large ones are simplified to fit your phone, with a note saying how much

MEASURE A CAD FILE WITH CONFIDENCE
• Smart Measure: tap a hole, edge or face and get the dimension that matters
• Hole diameter, hole-to-hole distance, wall thickness, fillet radius, chamfer, taper angle, arc length and face area
• Hole charts in shop language: Ø, THRU, BLIND, counterbore, countersink, slots
• Magnetic snapping to edges, centres and points
• Every result is labelled Exact, Approximate or Cannot verify safely, with a visible reason - no silent guesses
• Millimetres or inches, with undo and clear

SEE INSIDE THE MODEL
• Cut a CAD model open in 3D on X, Y or Z with the cut face filled, or read the live 2D profile
• Exact kernel sections where possible, clearly marked when approximate
• Export section curves as DXF, SVG or CSV

RENDER AND SHARE
• Render Studio: give parts real materials - tool steel, chrome, cast iron, anodized aluminium, paint - light them in a studio or a photographed workshop, and share photo-quality pictures
• Show as 3D printed: FDM, resin, SLA, SLS or metal layer lines at the layer height you choose

UNDERSTAND ASSEMBLIES
• Assembly viewer with a searchable parts list
• Hide, show and isolate single parts or whole branches
• Explode, ghost and move parts to see how they fit, then undo
• Part weight, volume, surface area and centre of gravity for quoting
• Clearance and interference checks between two parts

DRAW, COMPARE AND REPORT
• 2D drafting views with hidden lines and dimensions, exported as DXF or PDF
• Compare two revisions, or left- and right-hand parts, side by side with the changes highlighted
• Face notes, saved viewpoints, annotated screenshots and PDF or CSV reports

MADE FOR PHONES
• One-handed use, light and dark themes, and a short guided tour on a sample part

BUILT FOR
CNC and VMC shops, tool rooms, press-tool and sheet-metal die makers, mould shops, QA and inspection teams, vendors, field engineers and CAD/CAM students - anyone checking a CAD file without a desktop CAD seat.

PRIVACY
CAD processing happens on your device. No account, no advertising; the only network request checks a public file for a new version. Crash reporting is optional (About).

HONEST LIMITS
PartLens is a CAD viewer and measurement tool, not a CAD editor, and never changes your original file. CATIA and 3DXML files are shown from the display shape saved inside them; PartLens rebuilds holes and faces from it but labels them approximate, so for certified exact numbers open a STEP export. STL and OBJ meshes measure approximately by nature. If a file does not open well, tap Report problem.

Powered by Saptasati Industries Pvt Ltd. Developed by Bhupendra L Warade.

CATIA and 3DEXPERIENCE are registered trademarks of Dassault Systèmes. PartLens is not affiliated with or endorsed by Dassault Systèmes.