Calistra Viewer

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.