# Calistra Viewer > Offline 3D CAD viewer for engineers and designers with measurement and material tools. (iPhone/iPad app by CHANCELLOR G KREMER.) - Source: https://appshunter.io/ios/app/calistra-viewer/id6758898157 (this page in markdown: same URL + `.md`) - Developer: [CHANCELLOR G KREMER](https://appshunter.io/developer/1875360256) - Category: Productivity, Graphics & Design - Price: Free with in-app purchases (on sale, was $2.99) - Rating: 5.00/5 from 4 App Store ratings · 1 written reviews indexed - Age rating: 4+ - Requires: iOS 26.0 · 345 MB - Languages: American English - Released: 2026-02-18 - Data updated: 2026-08-30 - Monetization: free with in-app purchases - User reviews in markdown: https://appshunter.io/ios/app/calistra-viewer/id6758898157/reviews.md ## What is 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. ## Key features - Supports STEP, IGES, STL, OBJ, glTF, GLB, PLY, VRML, BREP formats - Precise measurement of dimensions, angles, and lengths - Material assignment and weight calculation - Wireframe, shaded, and edge display modes - Fully offline operation, no account or internet needed - Apple Pencil support with hover previews ## Pricing and in-app purchases Base price: Free. **One-time purchases** | Purchase | Price | Type | | --- | --- | --- | | Pro Upgrade | $6.99 | one-time | ## Recent user reviews (1 of 1) All indexed reviews: https://appshunter.io/ios/app/calistra-viewer/id6758898157/reviews.md ### 5/5 — CNC *2026-03-05* 5-star ## Frequently asked questions about Calistra Viewer ### What file formats does CNC Model Viewer support? CNC Model Viewer supports a comprehensive range of CAD file formats including STEP, IGES, STL, OBJ, glTF, GLB, PLY, VRML, and BREP. This allows for broad compatibility with various design and engineering software. ### Can I measure dimensions within the 3D models using CNC Model Viewer? Yes, CNC Model Viewer offers robust measurement tools. You can select faces and edges to measure diameters, distances, angles, and lengths. Apple Pencil support on iPad enhances precision with hover previews. ### Does CNC Model Viewer require an internet connection to function? No, CNC Model Viewer is designed to operate fully offline. No account is required, and all processing happens on your device, ensuring your files remain private and accessible without an internet connection. ### How does CNC Model Viewer handle materials and weight calculations? The app includes a built-in Material Library for assigning materials to parts. Based on the selected material, it can accurately calculate the model's weight, even for multi-material assemblies. ### What display modes are available in CNC Model Viewer? CNC Model Viewer provides customizable viewing options, including wireframe, shaded, and edge display modes. You can also adjust part, edge, and background colors, and it supports dark mode. ### Is CNC Model Viewer suitable for all ages? CNC Model Viewer has an age rating of 4+, making it suitable for a wide audience. Its primary functionality is geared towards professional use in engineering and design fields. ### How often is CNC Model Viewer updated? The latest version of CNC Model Viewer is 3.4, which was last updated on March 20, 2026. This indicates a recent update, suggesting ongoing development and support. ### What devices are compatible with CNC Model Viewer? CNC Model Viewer is optimized for iOS devices and is compatible with both iPhones and iPads. This ensures a seamless experience across Apple's mobile and tablet platforms. ## Version history (last 5 releases) ### 4.0 — 2026-08-23 • 120 fps everywhere: keyboard orbit and pan on iPad now stay perfectly smooth, every time • Two-finger pan and pinch zoom are more reliable — pinch zooms exactly where your fingers are • Drawings pan with a single finger again • Redesigned Keyboard & Shortcuts: tap any action, press your keys, done — with a live tester so you can confirm a shortcut works • Faster first open on a fresh install • Materials & Weight is simpler: your favorites, front and center ### 3.5 — 2026-05-05 Real Time Path Tracing All new Visual Effects Demo Studio ### 3.4 — 2026-03-20 New Measurement Modes Performance Improvements ### 3.3 — 2026-03-20 **What’s New** - Added Apple Pencil support on iPad, including hover-based measurement previews in Measurement Mode for more precise feature targeting before selection. - Added a Material Library with model weight calculation based on the assigned material. - Added per-component material assignment for assemblies, enabling more accurate aggregate weight calculations for multi-material models. ### 3.2 — 2026-03-19 Added Apple Pencil Support - Hover over faces or edges to preview measurements Added Selection Targets - Filter by Face, Edges, or Components Double Tap Pencil to swap between Selection Targets Added support for PDFs Improved DXF Rendering Performance Improvements --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-30.*