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What is the difference between the Free plan and the Pro plan?

Using CalcSteel
Free: 3D editor, FEM analysis, 25 analyses/month, 3 projects, 1 sheet per project, PDF export with watermark, full profile catalog, all 41 design standards. Starter ($9/mo annual): 50 analyses/month, unlimited projects, 2 sheets per project, clean PDF export. Pro ($24/mo annual): unlimited analyses, unlimited projects and sheets, company logo on PDF reports, priority support, advanced features. The Free plan is fully functional for learning, student projects and occasional small designs. Pro is for practicing engineers who deliver projects to clients and need unlimited usage without restrictions.

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