Structural Engineering in Your BrowserThe ease of coding in Python with the speed of Rust.
Browser-based structural frame analysis for structural and civil engineers.
FERS is a structural engineering tool that runs entirely in your browser: analyze 3D frames, trusses and members with linear or second-order analysis and Eurocode EC3 steel checks, integrate with your Python workflow, and get results in seconds.
Upload Your JSON File
No account required. Just upload your structural model JSON file and see the results instantly. Create yours with our Python library.
Drag & drop your JSON file
or click the button below to browse your files
Powerful Features
FERS combines the best of web technologies with high-performance computing to deliver a seamless structural engineering experience.
Blazingly Fast
Powered by Rust and WebAssembly for near-native performance right in your browser.
Python Integration
Seamlessly integrate with your existing Python workflows and libraries.
Browser-Based
No installation required. Run 3D frame, truss and member analysis directly in your browser.
JSON-Powered
Simple JSON format for model definition makes it easy to integrate with any workflow.
Shareable Results
Share your analysis results with colleagues through simple URLs.
Results and reports
Displacements, reactions, member forces and deflected shapes, plus Eurocode EC3 unity-check reports.
Free structural calculators
No-sign-up tools that run in your browser — each one cross-checked live against the FERS finite-element solver.
Beam equations
Frames and sections
Code checks and validation
Simple, Transparent Pricing
Choose the plan that works best for your engineering needs. Models up to 100 members are always free.
- Full solver, all analysis types — up to 100 members
- JSON model import & export
- Python SDK & MCP access (100 solves/week)
- Community support
- Everything in Free
- Up to 10,000 members
- Cloud model storage & folders
- Sharing links
- Unlimited SDK & MCP solves
- Priority support