In use + in development
Structural
Loads, wind and foundations in use. Slabs, beams and columns in development.
A startup for the next way to design
Engineering
moves forward.
The way we
design does too.
versortech is building fablecalc: AI that connects design intent with , from foundations to building systems.
Product in development
Workflow vision · fablecalc
- 01
The project
Documents · data · intent
- 02
AI organizes
Request → confirmed inputs
- 03
The engine calculates
Standards · methods · determinism
- 04
The engineer decides
Comparison · review · design
- 05
From calculations to BIM
Reviewed elements · planned integration
A proposed workflow connecting conversation, calculation, professional responsibility and BIM modeling.
Opportunity
One design revision.
Many tasks to repeat.
Interpreting documents, adjusting inputs, checking standards, recalculating and explaining results. Connecting these steps can give engineers more time to explore alternatives and make design decisions.
Explore the idea
Change an input.
Watch the calculation respond.
Explore foundations, structures and building systems in an interactive simulation of the proposed workflow for fablecalc.
An illustrative simulation with simplified calculations to demonstrate the workflow. This is not the fablecalc engine, and the results must not be used for engineering design.
fablecalc · model-house / footing-s1-p1
Simulation
Assistant:
Describe the footing (column, load and soil) or attach the example files. This chat is simulated: I read the text with rules, no language model, and every number comes from the calculation engine.
Waiting for the engineer's assumptions…
Describe the case or attach the example files with the + button.
Engineer review: pending · Sign-off: pendingInterface prototype · simplified calculations
What sets us apart
Standards studied. Methods coded. Results checked.
We study the standards relevant to each subject and the adopted methods to translate their procedures into deterministic routines with explicit assumptions, units and limits. The engine keeps checks and unresolved items for engineering review.
In the platform vision, AI organizes documents, requests missing inputs and helps analyze changes. Calculations stay in the engine; the engineer confirms assumptions and makes decisions.
Explore the engine process and workflowValidation process
Test, compare and review.
- 01Automated tests with synthetic cases, boundary conditions and regressions across engine modules.
- 02Reference cases and manual checks, with defined assumptions and tolerances.
- 03Review of assumptions, results and unresolved checks in the context of each design.
Coverage varies by module. External specialist review and testing with professionals and researchers are part of the preparation for public access.
Planned integration
The calculation is a step. The model is the next.
Our next step is to bring designed and reviewed elements into Revit and other BIM tools, connecting calculations, modeling and multidisciplinary coordination.
We plan to build on existing tools and open standards. Assistants such as Claude Code and Codex can orchestrate MCP connectors and APIs; fablecalc’s deterministic engines remain responsible for the calculations.
- 01Reviewed elements
- 02MCP + APIs
- 03BIM model
- 04Discipline coordination
Explore the complete project and simulate inserting footing S1 beneath column P1. This example uses the inputs from the demo above: adjust them to update the element here too.
From calculation to BIM model
Ready to simulate
fablecalc
S1
Claude / Codex
S1
MCP / API
A / 1
Revit / BIM
P1
Data flow · simulated
S1 package awaiting transfer
Destination · simulated Revit / BIM
3D view · A–C / 1–3Drag or use ← → to orbit
S1 / P1 · awaiting transfer · 2.45 × 2.65 × 0.70 m
Project model
2 storeys · 6.00 m
9 columns · beams · slabs
S1 / P1 · awaiting transfer
Selected element · S1 / P1
S1 not yet inserted
Column P1: 0.40 × 0.60 m
Service load: 1200 kN
Geometry in metres
The building, other foundations and load arrows are illustrative. Only S1 uses the demo’s current result.
An ecosystem to connect
Claude Code
AI assistant · local MCP support
Codex
AI agent · MCP support
MCP
Open protocol for connecting tools
Autodesk Revit
Official local MCP · Technical Preview
Speckle
Existing connectors for BIM data exchange
The official Revit MCP is currently in Technical Preview for Revit 2027.2. Model updates will depend on supported operations, element mapping and engineer review.
Tools and standards being evaluated for planned integrations. Their inclusion does not imply a commercial partnership or an integration available in fablecalc today.
Roadmap
One platform. Multiple disciplines.
Foundations and geotechnics are the starting point. Structures, building systems and an integrated platform expand the vision.
In use + in development
Geotechnics and foundations
From the SPT log to bearing capacity and settlement, already in use.
Planned
Electrical
In planning.
Planned
Plumbing
In planning.
In development
Platform
Conversational AI, a parametric model, 3D, BIM and an API on top of the same calculation engines.
. “In use” means modules used on Versor projects, with no public access yet. Roadmap targets are subject to change and validation.
Who is building it
Meet the team
Filipe Carboni Fim
Founder · Civil engineer
João A. de Barros
Co-founder · Software and product
Vinicius Carboni Fim
Originator of SAASim · Civil engineer
Build with the people who will use it
Let’s bring engineering, research and product together.
We want to hear from engineers, design firms, educators and researchers. Our next step is to bring fablecalc to educators and researchers at UCS and other universities to test and improve the modules.
These links open a WhatsApp conversation.
Interest list
Get versortech updates and invitations to the pilots. For current projects and construction work in Brazil, Versor's team is available on WhatsApp.
The essentials before you begin.
Is fablecalc available yet?
It is not open to the public yet. Loads, wind, geotechnics and foundation modules are already used on Versor projects. The others are in development or planned on the roadmap.
What is the engineer’s role?
fablecalc speeds up the selection of structural systems and the calculations, with the reliability of deterministic calculations based on standards and established methods. The engineer sets the inputs, reviews and signs off on the design.
How will it be prepared for public launch?
The validation plan before public launch includes comparison against reference calculations, specialist review and testing with professionals and researchers.