> For the complete documentation index, see [llms.txt](https://docs.studio.cogram.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.studio.cogram.com/faq.md).

# FAQ

**Do I need an account?** No. You can design without signing in. An account is needed to save work, export files, or share models.

**What file formats are supported?** Import: IFC, STEP. Export: IFC, SVG (2D drawings).

**What units does it use?** Millimeters internally. You can say "6 meters," "200mm," or "8 feet" — the agent converts.

**Can I modify an imported model?** You can add new elements around it and ask questions about it. You can't reshape the imported geometry itself — it comes in as mesh, not parametric.

**How do I undo?** Cmd+Z (Mac) or Ctrl+Z (Windows). Or click any checkpoint marker in the chat to jump back to that state.

**Can I share my model?** Click Share in the toolbar. Anyone with the link can view the 3D model. They can't edit it.

**Can it do curved or organic shapes?** Yes. BSpline profiles, revolutions, elliptical walls — these work. Complex shapes may take a few iterations to get right.

**What's the difference between Build, Plan, and Sketch modes?** Build creates 3D geometry. Plan lets you discuss and inspect without changing anything. Sketch creates 2D layouts on the ground plane.

**The agent got something wrong. What do I do?** Be specific about what's wrong ("the wall is 200mm too short"), or undo with Cmd+Z and try again with clearer instructions. You can also click a checkpoint to restore an earlier state.

**Does it work on mobile?** Desktop with a mouse or trackpad works best.

**What's the geometry engine?** FreeCAD 1.0, built on OpenCascade. The same kernel used in professional CAD/CAM tools.

**Can I use it offline?** No. Studio runs in the browser and needs an internet connection.


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