# Caddis: DWG & CAD Viewer — Measure & mark up DXF, STL, 3D

> Measure & mark up DXF, STL, 3D (iPhone/iPad app by Jacob Blumsack.)

- Source: https://appshunter.io/ios/app/caddis-dwg-and-cad-viewer/id6799798132 (this page in markdown: same URL + `.md`)
- Developer: [Jacob Blumsack](https://appshunter.io/developer/6799798134)
- Category: Productivity, Utilities
- Price: Free
- Age rating: 4+
- Requires: iOS 13.0 · 52 MB
- Languages: American English
- Released: 2026-08-23
- Data updated: 2026-09-17
- User reviews in markdown: https://appshunter.io/ios/app/caddis-dwg-and-cad-viewer/id6799798132/reviews.md

## What is Caddis?

Caddis is the fast, private way to open and review CAD drawings and 3D models on iPhone and iPad — no account, no sign-up, no cloud upload. Open a DWG, DXF, STL, STEP, OBJ, PLY, IFC, or SolidWorks file straight from Files, then measure it, mark it up, and share your review in seconds.

WHY CADDIS

• Fast — files are parsed and rendered right on your device
• Private — no ads and no account. Drawing files leave the app only when you tap Share.
• Offline — review drawings on-site, in the field, or on a plane with no connection

REVIEW TOOLS

• Pan, zoom, fit, rotate, and orbit 2D drawings and 3D models
• Measure distance, angle, area, and perimeter
• Display in feet, feet and inches, inches, US survey feet, meters, or millimeters
• Mark up with notes, arrows, rectangles, and revision clouds
• Snap annotations to supported drawing geometry or mesh vertices
• Toggle and isolate layers where source layers exist
• Save named locations and keep your review state on-device
• Share the current view as a PNG, the original file, or portable annotation JSON

SUPPORTED FORMATS

• DWG and DXF 2D drawings
• STL, OBJ, and PLY 3D meshes
• STEP / STP tessellated models
• IFC building geometry
• SolidWorks SLDPRT and SLDASM (saved display tessellation)

Caddis renders real, source-derived geometry — never a generated stand-in — and clearly reports anything it cannot open instead of faking a preview. Coverage varies by file version, exporter, and device.

FORMAT NOTES

DWG supports R14, R2000, R2004, R2007, and R2010–R2018 model-space geometry. Coverage varies by file version, exporter, and device. DXF must be ASCII. STEP/STP, IFC, and SolidWorks coverage is limited to tessellated or faceted geometry, not full parametric or BIM semantics. Some layouts, xrefs, hatches, dimensions, fonts, materials, and textures are not yet covered.

IMPORTANT

Caddis is a viewing, measuring, and markup tool — not a CAD editor or a source of engineering certification. Always confirm critical dimensions, scale, and geometry against the authoritative source before construction, fabrication, or safety decisions. Snapping targets supported geometry; the visible grid is a navigation aid.


## Version history (last 3 releases)

### 1.0.2 — 2026-09-15

• Expanded DWG compatibility, including R14, R2000, R2004, and R2007 drawings
• More reliable handling of large drawings, with clear partial-detail messaging when limits apply
• Improved DWG text rendering and STEP surface support
• Full Spanish localization across the app
• A more natural way to share feedback after successful file opens

### 1.0.1 — 2026-08-31

Improved CAD file compatibility and reliability when opening and reviewing drawings and models. Enhanced measurement, markup, layer controls, and export workflows.

### 1.0 — 2026-08-23

No release notes.

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*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 2026-09-17.*