Frequently asked questions

No. Structural runs in your web browser: open app.structlib.com/structural/ and it is ready. If you would rather work in a desktop application, there is one for Windows, macOS and Linux on the download page at app.structlib.com/download, on every plan, Free included.

No. You can open any of the 20 sample models and run the analysis without signing in. A free account lets you save your own models to projects.

The Free plan costs nothing: models up to 300 members, up to 3 saved cloud projects, analysis in your browser or the desktop app and 20 AI copilot turns a month. Pro and Team remove those limits and add the cloud engine; their prices are planned and shown on the pricing page at structlib.com/pricing, and online payment is not open yet — email [email protected] to use one now.

In the browser, the solver runs on your own computer as WebAssembly, and the model never leaves it. The desktop app, on every plan, runs it natively on your machine. On Pro and Team you can also run on the cloud engine, which sends the model to the server where the same solver runs natively. It is one solver in every case, so the answers agree.

Linear static, modal, response spectrum, buckling and P-Delta analysis of 3D models made of frames and plates, with load patterns, load cases and combinations. Results are shown as diagrams on the model and in tables you can copy into a spreadsheet or download as CSV.

Member design to Eurocode 3 (EN 1993-1-1) and AISC 360 for steel, Eurocode 2 and ACI 318 for concrete, and Eurocode 5 and NDS for timber. The design report can be printed or saved as a PDF.

STAAD.Pro .std files, SAP2000 .xml and .sdb files, IFC, and SkyCiv .json and XFEM4U .xml exports. Every import writes a log that counts what was brought across and names each assumption and everything that was not, so nothing is dropped silently.

The steel member checks replay 28 worked examples from published design guides on every release, clause by clause, and the analysis is checked against the published CSI verification examples 1-001, 2-002, 2-005 and 2-006 and against closed-form solutions for stability and dynamics. AISC 360, concrete and timber design have no published-example suite yet; they rest on hand-checked tests.

You describe a change in plain language and the copilot makes it by running the same modelling commands you would — creating nodes, members, sections, supports and loads — and every change can be undone. It never produces results itself: the analysis engine alone computes them.

Yes. StructLib is an MCP server at https://app.structlib.com/api/mcp. Once you connect an assistant such as Claude and grant it access, it can open the models saved in your projects, run them on the cloud engine, read the results, and edit and save them.

Besides Structural there is Connection Design for steel moment and shear connections, Quick Design — a collection of calculators for single checks in steel, concrete, timber, foundations and wind and seismic loads — and SeismoLab for analysing earthquake ground-motion records: time series, ground-motion parameters, response spectra, filtering and Fourier spectra.