Calistra Viewer

Open STL, OBJ, glTF, PLY, 3MF, USDZ, JT and DXF/DWG drawings at 120 fps. Measure exactly, set materials, edit drawings. Fast, precise, no account required.

Calistra Viewer opens your 3D models and 2D drawings instantly and lets you inspect, measure and share them — with the speed and precision of a professional CAD kernel, on your iPhone and iPad.

3D MODELS • Open STL, OBJ, glTF/GLB, PLY, 3MF, VRML, USDZ/USD and JT files • Buttery 120 fps orbit, pan and zoom — even on very large meshes • Exact measurements: distances, diameters, radii, angles, edge lengths, areas • Instant unit switching between millimeters and inches • Weight & Material: pick from a curated library of metals, plastics and composites and see the model's mass instantly • Part browser for multi-body files — isolate, hide and show components • Beautiful photoreal shading out of the box

2D DRAWINGS • Open DXF and DWG drawings with exact geometry, layers and dimensions • Full drawing editor: draw, dimension, snap, measure and export • Measurements read in the drawing's true units

BUILT FOR SPEED • Models open in a fraction of a second, from the very first launch • Hardware-accelerated rendering tuned for Apple silicon and 120 Hz displays • Full keyboard support on iPad: orbit, pan and zoom with the arrow keys, customizable shortcuts

WORKS YOUR WAY • Open files from Files, iCloud Drive, AirDrop, Mail or any app's share sheet

Whether you're checking a print before it hits the build plate, reviewing a supplier's part on the shop floor, or reading a drawing on site, Calistra Viewer gives you an exact answer, fast.