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.
Privacy-Focused
Your data stays in your browser. We don't store your files on our servers.
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.
Draw any 2D beam or frame and get support reactions, a free-body diagram and axial, shear and bending-moment diagrams.
Maximum bending moment, support reactions and deflection for a central point load or a uniformly distributed load.
Fixed-end bending moment, reaction and tip deflection for an end point load or a uniformly distributed load.
Support and midspan bending moments, reactions and deflection for a fixed-fixed (encastré) beam.
Fixed-end and span bending moments, both reactions and deflection for a fixed-pinned beam.
EN 1993-1-1 unity check for an IPE/HEA/HEB beam — bending, shear, N+M and lateral-torsional buckling utilizations, solved live with a per-clause trace.
See FERS reproduce the standard NAFEMS finite-element benchmarks it can represent — beam free-vibration and plate/membrane statics — with live in-browser solving and target-vs-FERS error.
Describe a steel beam in plain English and get an EN 1993-1-1 check computed by the real FERS solver — a limited free demo (a few messages per day); connect your own LLM via MCP for unlimited use.
View all calculators →Join the FERS Engineering mailing list
Product updates, feature launches, and engineering deep dives. No spam.
We use single opt-in. You can unsubscribe at any time from any email we send.
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
About Our Pricing
Our pricing structure is designed to be fair and transparent. Subscription fees help cover the costs of:
- Cloud Infrastructure
Hosting, database, and storage for your saved models
- Security & Compliance
Enterprise-grade security to protect your data
- Ongoing Development
New analysis types, integrations, and platform improvements
Why We Charge
While we offer a free tier to get you started with FERS, structural analysis requires significant computing resources. Your subscription helps us maintain a reliable, high-performance platform while continuing to develop new features.
We're committed to providing the best value possible while ensuring the platform remains sustainable for years to come.