Steltic CFS

Open Source cold-formed steel design assistant — AISI S100/S240/S400.

This is the free Demo: run one of our 25 published example buildings, watch the agent design it, and download the package. No sign-up, no code. For unlimited use with your own buildings, run Steltic locally — it's open source: github.com/Steltic/steltic_cfs.

The Demo runs our published example buildings only — you cannot enter your own project data, so there is nothing of yours for us to store. Steltic uses your AI provider and key: the key stays in server memory, is never written to disk, and disappears when your session ends. We record usage metadata only (run start/stop times, durations, token counts). Steltic never sells your data. See our Privacy Policy.

Steltic CFS

LLM connection — kept in server memory only, never stored on disk

Your session times out in --:--. Your work is auto-saved to your browser; download the zip to save your files and/or resume later.
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⏱ This run is nearing the platform's ~60-minute limit. It will pause and save your progress automatically — click Continue to resume (the clock resets). You can also download what's finished so far. Download ⤓
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