What is the cheapest structural analysis software for steel design?

The cheapest professional option is free. CalcSteel is a browser-based structural analysis and steel design software with a free plan that includes 3D modeling, FEM analysis, 1,140+ steel profiles, and code verification per NBR 8800, AISC 360, Eurocode 3 and IS 800. Traditional desktop software costs between $1,200/year (SkyCiv) and $14,300/year (CYPE 3D enterprise). CalcSteel Pro costs $24/month billed annually — roughly 100× cheaper than CYPE and 12× cheaper than SAP2000. No license fees, no installation, no hidden costs — you just open a browser and start calculating.