Caddis CAD REVIEW

Free online CAD viewer

A practical CAD viewer for drawings and models.

Caddis brings supported geometry from DWG, ASCII DXF, STEP/STP, STL, OBJ, PLY, and IFC into one local-first review workspace. Compatibility varies by version and source feature; unsupported geometry is reported rather than silently approximated.

Open the free viewerDownload on the App Store
No account required for local viewing. Files stay on your device unless you opt into Cloud.

Which CAD files can Caddis view?

Caddis opens documented subsets of DWG, ASCII DXF, STEP/STP, STL, OBJ, PLY, and IFC. DWG, STEP/STP, and IFC are limited-compatibility formats, not universal import claims. Caddis is built for review, not engineering certification.

Caddis on iPhone measuring a 7.7-foot stair run in a DWG floor planMeasure a stair run on site

Field-review workflow

From drawing to clear feedback.

  1. 01Open the Caddis web viewer.
  2. 02Choose a supported CAD file from your device.
  3. 03Inspect, measure, and mark up the file as needed.

Built for practical review

2D drawings and 3D models in one workspaceLayer, measurement, and markup toolsLocal-first file handlingOptional cloud sync and revocable share links

Your drawings stay under your control

Caddis is local-first: opening a supported file for local review does not require uploading it. If you choose Caddis Cloud, you can continue a project across devices or create a revocable, read-only link.

Frequently asked questions

Do I need an account to use Caddis?

No. You can open and review supported files locally without creating an account. An account is only needed for optional cloud features.

Are my CAD files uploaded?

Not for local viewing. Caddis processes supported files on your device. Cloud storage and share links are opt-in per project.

Can I use Caddis offline?

Local review is designed to work on your device. Cloud sync and share links naturally require an internet connection.

Which CAD formats can Caddis open?

Caddis opens supported geometry from DWG, ASCII DXF, STL, OBJ, PLY, STEP/STP, and IFC files. DWG, STEP/STP, and IFC compatibility is limited by source version and geometry type; unsupported geometry is reported rather than silently replaced.

Explore Caddis tools

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